从今天开始，我打算把自己所有遇到的错误，无论大大小小，都保存下来，以供自己反思，少点粗心才能提高效率

1、This application is modifying the autolayout engine from a background thread after the engine was accessed from the main thread. This can lead to engine corruption and weird crashes.

2017-12-20 21:29:03.954058+0800 SwiftLive[3749:2123191] This application is modifying the autolayout engine from a background thread after the engine was accessed from the main thread. This can lead to engine corruption and weird crashes.
 Stack:(
    0   CoreFoundation                      0x000000018cbbaff8 <redacted> + 148
    1   libobjc.A.dylib                     0x000000018b61c538 objc_exception_throw + 56
    2   CoreFoundation                      0x000000018cbbaf28 <redacted> + 0
    3   Foundation                          0x000000018d7ad378 <redacted> + 128
    4   Foundation                          0x000000018d7ad0f8 <redacted> + 76
    5   Foundation                          0x000000018d5f9b48 <redacted> + 132
    6   Foundation                          0x000000018d7abd80 <redacted> + 112
    7   UIKit                               0x0000000192ce9eac <redacted> + 1692
    8   QuartzCore                          0x000000018feda274 <redacted> + 148
    9   UIKit                               0x000000019333a234 <redacted> + 64
    10  QuartzCore                          0x000000018fecede8 <redacted> + 292
    11  QuartzCore                          0x000000018fececa8 <redacted> + 32
    12  QuartzCore                          0x000000018fe4a34c <redacted> + 252
    13  QuartzCore                          0x000000018fe713ac <redacted> + 504
    14  QuartzCore                          0x000000018fe716d8 <redacted> + 244
    15  libsystem_pthread.dylib             0x000000018bc7be20 <redacted> + 572
    16  libsystem_pthread.dylib             0x000000018bc7bb48 <redacted> + 200
    17  libsystem_pthread.dylib             0x000000018bc7b1d8 _pthread_wqthread + 1312
    18  libsystem_pthread.dylib             0x000000018bc7acac start_wqthread + 4
)

从上面的报错信息可以看出，线程在运行的时候子线程修改了主线程UI的布局约束，在iOS开发中，所有的有关界面UI的更新操作必须要在主线程中完成。

在需要的时候，加上下面这句吧：

dispatch_async(dispatch_get_main_queue(), ^{ //inset code….

});

2、attempting to add unsupported attribute: (null)

2017-12-22 16:31:25.357 SwiftLive[3878:2402908] <Unknown>: [BLYLog]  Trapped uncaught exception 'NSInternalInconsistencyException', reason: 'attempting to add unsupported attribute: (null)' 
(
    0   CoreFoundation                      0x000000018cbbaff8 <redacted> + 148
    1   libobjc.A.dylib                     0x000000018b61c538 objc_exception_throw + 56
    2   CoreFoundation                      0x000000018cbbaeb4 <redacted> + 0
    3   Foundation                          0x000000018d653760 <redacted> + 112
    4   SwiftLive                           0x00000001007c47d0 -[MASViewConstraint setSecondViewAttribute:] + 772
    5   SwiftLive                           0x00000001007c5730 __40-[MASViewConstraint equalToWithRelation]_block_invoke + 1756
    6   SwiftLive                           0x00000001007be424 __24-[MASConstraint equalTo]_block_invoke + 100
    7   SwiftLive                           0x000000010017741c __29-[FLGiftSendView configureUI]_block_invoke.66 + 516
    8   SwiftLive                           0x00000001007cbfd8 -[UIView(MASAdditions) mas_makeConstraints:] + 132
    9   SwiftLive                           0x0000000100175b7c -[FLGiftSendView configureUI] + 752
    10  SwiftLive                           0x00000001001757c4 -[FLGiftSendView initWithFrame:] + 332
    11  SwiftLive                           0x000000010045eb2c -[FLChooseGiftsView setupUI] + 3680
    12  SwiftLive                           0x000000010045dbb4 -[FLChooseGiftsView init] + 136
    13  SwiftLive                           0x0000000100291570 -[FLLiveMainInterfaceViewController setupContentView] + 4680
    14  SwiftLive                           0x000000010028f3bc -[FLLiveMainInterfaceViewController setupUI] + 2708
    15  SwiftLive                           0x00000001002881e0 -[FLLiveMainInterfaceViewController viewDidLoad] + 344
    16  UIKit                               0x0000000192cecb04 <redacted> + 1036
    17  UIKit                               0x0000000192d04590 <redacted> + 132
    18  UIKit                               0x0000000192e88e18 <redacted> + 1144
    19  UIKit                               0x0000000192da37bc <redacted> + 676
    20  UIKit                               0x0000000192da3424 <redacted> + 64
    21  UIKit                               0x0000000192da3388 <redacted> + 188
    22  UIKit                               0x0000000192ce9cc0 <redacted> + 1200
    23  QuartzCore                          0x000000018feda274 <redacted> + 148
    24  QuartzCore                          0x000000018fecede8 <redacted> + 292
    25  QuartzCore                          0x000000018fececa8 <redacted> + 32
    26  QuartzCore                          0x000000018fe4a34c <redacted> + 252
    27  QuartzCore                          0x000000018fe713ac <redacted> + 504
    28  QuartzCore                          0x000000018fe71e78 <redacted> + 120
    29  CoreFoundation                      0x000000018cb689a8 <redacted> + 32
    30  CoreFoundation                      0x000000018cb66630 <redacted> + 372
    31  CoreFoundation                      0x000000018cb66a7c <redacted> + 956
    32  CoreFoundation                      0x000000018ca96da4 CFRunLoopRunSpecific + 424
    33  GraphicsServices                    0x000000018e501074 GSEventRunModal + 100
    34  UIKit                               0x0000000192d51c9c UIApplicationMain + 208
    35  SwiftLive                           0x0000000100437dd8 main + 312
    36  libdyld.dylib                       0x000000018baa559c <redacted> + 4
)

从上面的报错信息，没有什么意外,就是上一个控件布局有问题,或者是布局的顺序有问题，也有可能是约束冲突，或者约束不全。

使用Masonry要注意约束的完整性。否则就会出现上述报错。

3、今天很坑的一个事情，我想写一个不固定高度的View，View里面放一些控件,我还要给View描边，整个布局布局好以后，发现View里面的控件没有出来,然后我各种看小面包，左边显示控件是存在的，右边的界面却和真机一样没有出来，苦了我又是设置背景颜色调试，又是各种检查布局的，下面是我布局的代码：

约束检查了一遍又一遍，还是没有任何思路，这里要感谢师父一直给我提示，给我一些调试的方法，我就感觉，应该还是布局的问题，于是我改了如下代码：

我将 
make.height.mas_lessThanOrEqualTo(33 * ScreenHeightRatio);

这句代码改成了

make.height.mas_equalTo(33 * ScreenHeightRatio);

结果就可以了，说明用masorny布局，不确定高度的View，是不可以描边等操作的，会出现一系列的问题，可怜我太菜，这个问题调试了很久

4、关于IOS开发之关于UIButton点击没有响应问题

在做UI界面的时候，确认butten 是最后添加的呀，但是，怎么就不响应点击方法呢？小面包查了一遍又一遍，真的是粗心误大事，

    感谢在网上找到的资料，保存一下：

1、如果一个UIButton的frame超出父视图的frame，UIButton还是可以显现的，但响应不了点击事件了，当开发中，遇到UIButton点击没有响应问题时，我们需要输出btn及它父视图的frame，看看btn.frame是否超出view

2、还可以通过Debug—->View Debugging—->show ViewFrames查看按钮上层是否有透明视图。

我的是第一种：UIButten控件大小超出了父控件的大小，所以响应不了点击事件了。

5、-[__NSCFDictionary length]: unrecognized selector sent to instance 0x171c60980’

出错在类型上面，我定义的是nsnumber类型，而拿到的是后天返回的是nsstring类型，直接赋值了，小白果然效率低，哎。。。。。。。。。。

2017-12-23 19:29:41.451 SwiftLive[4057:2610494] <Unknown>: [BLYLog]  Trapped uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary length]: unrecognized selector sent to instance 0x171c60980' 
(
    0   CoreFoundation                      0x000000018cbbaff8 <redacted> + 148
    1   libobjc.A.dylib                     0x000000018b61c538 objc_exception_throw + 56
    2   CoreFoundation                      0x000000018cbc1ef4 <redacted> + 0
    3   CoreFoundation                      0x000000018cbbef54 <redacted> + 916
    4   CoreFoundation                      0x000000018cabad4c _CF_forwarding_prep_0 + 92
    5   UIKit                               0x0000000192cf66c8 <redacted> + 312
    6   SwiftLive                           0x000000010014f574 -[FLGiftSendView tableView:didSelectRowAtIndexPath:] + 900
    7   UIKit                               0x0000000192e17a9c <redacted> + 1200
    8   UIKit                               0x0000000192ec7820 <redacted> + 268
    9   UIKit                               0x0000000192f79594 <redacted> + 292
    10  UIKit                               0x0000000192f6b630 <redacted> + 528
    11  UIKit                               0x0000000192cdf28c <redacted> + 132
    12  CoreFoundation                      0x000000018cb689a8 <redacted> + 32
    13  CoreFoundation                      0x000000018cb66630 <redacted> + 372
    14  CoreFoundation                      0x000000018cb66a7c <redacted> + 956
    15  CoreFoundation                      0x000000018ca96da4 CFRunLoopRunSpecific + 424
    16  GraphicsServices                    0x000000018e501074 GSEventRunModal + 100
    17  UIKit                               0x0000000192d51c9c UIApplicationMain + 208
    18  SwiftLive                           0x000000010040ba24 main + 312
    19  libdyld.dylib                       0x000000018baa559c <redacted> + 4
)

解决：NSString 转 NSNumber ：

lastSeletNum = @([self.comeShowArray[indexPath.row][@"gift_num"] integerValue]);

6、不能同时比较：

      我将一个string类型的字符串转换成int 类型，然后对齐比较大小，结果报了如下警告：

Comparison of constant 10 with boolean expression is always true

呼呼，不开森，iOS不能同时比较耶，要用&& 链接去比较

错误的代码如下：

if (1 <= [listModle.liver_grade integerValue] <= 10) { self.popularityImg.image = [UIImage imageNamed:@"icon_little_anchorlevel1_10"]; }else if (11 <= [listModle.liver_grade integerValue] <= 20){ self.popularityImg.image = [UIImage imageNamed:@"icon_little_anchorlevel11_20"]; }else if (21 <= [listModle.liver_grade integerValue] <= 30){ self.popularityImg.image = [UIImage imageNamed:@"icon_little_anchorlevel21_30"]; }else if (31 <= [listModle.liver_grade integerValue] <= 40){ self.popularityImg.image = [UIImage imageNamed:@"icon_little_anchorlevel31_40"]; }else if (41 <= [listModle.liver_grade integerValue] <= 50){ self.popularityImg.image = [UIImage imageNamed:@"icon_little_anchorlevel41_50"]; }

正确的代码如下：

NSInteger grade = [listModle.liver_grade integerValue];
    if (1 <= grade  && grade <= 10) {
        self.popularityImg.image = [UIImage imageNamed:@"icon_little_anchorlevel1_10"];
    }else if (11 <= grade && grade <= 20){
        self.popularityImg.image = [UIImage imageNamed:@"icon_little_anchorlevel11_20"];
    }else if (21 <= grade && grade <= 30){
        self.popularityImg.image = [UIImage imageNamed:@"icon_little_anchorlevel21_30"];
    }else if (31 <= grade && grade <= 40){
        self.popularityImg.image = [UIImage imageNamed:@"icon_little_anchorlevel31_40"];
    }else if (41 <= grade && grade <= 50){
        self.popularityImg.image = [UIImage imageNamed:@"icon_little_anchorlevel41_50"];
    }

7、应用在iPhone5 iPhone5s 上不全屏，上下各有黑块

在网上找到如下原因：

a、没有添加适配iPhone的 640 * 1136 分辨率的图片

b、整个工程中，有没有一个地方在设置画面高度时候使用了固定值480或568等，一般都是直接获取屏幕大小，然后再设置画面大小的。

c、如果用的有xib，就在xib里面设置一下view的自动布局；如果用的是纯代码，就手动设置UIView的autoLayout

d、UI给的图片有问题，或者自己没有把图片的位置放好

我就是属于第四种，各种办法试了试，如下配置正确：

SouthEast 1

启动图也都有：

SouthEast 2

结果就是有如下问题：

SouthEast 3

我就把启动图都删了，换上上家公司的启动图片，结果没有问题，所有就是现在UI给的启动图有问题喽，让UI重新学习iOS启动图切图，放上，就木有问题啦！

8、CollectionView 上拉加载更多刷新闪屏

在网上找了很多方法，不过好像并没有特别有用，最后采取的办法有如下几种，不过都感觉效果一般，先记下来，后面再试试：

方法一：
[UIView setAnimationsEnabled:NO];
[collectionView performBatchUpdates:^{
    [collectionView reloadData];
} completion:^(BOOL finished) {
    [UIView setAnimationsEnabled:YES];
}];

方法二：

[UIView animateWithDuration:0 animations:^{
    [collectionView performBatchUpdates:^{
        [collectionView reloadData];
    } completion:nil];
}];

注意：performBatchUpdates 这个方法是collectionView原来有数据的时候，上拉刷新才能用，第一次 reloaData 就调用这个方法，会崩溃的呦 QAQ

方法三：

NSMutableArray*indexPaths = [[NSMutableArray alloc] init];
for ( inti =0; i < model.mediumArr.count;  i ++) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow: self.dataSource.count+ i in Section: 0];
[indexPaths addObject: indexPath];
}
[self.dataSource addObjectsFromArray: model.mediumArr];
[self.collectionView insertItemsAtIndexPaths: indexPaths];
[UIView performWithoutAnimation:^{
[self.collectionView reloadItemsAtIndexPaths: indexPaths];
}];

注：model.mediumArr为加载进来的新数据源,也就是上啦加载出来的数据(数组)

具体想用哪个方法，自己试试看看拿个更好一些，后面找到更好的方法，会持续更新

9、图片填充方式：

1、UIViewContentModeScaleAspectFit, //这个图片都会在view里面显示，并且比例不变这就是说如果图片和view的比例不一样就会有留白

2、UIViewContentModeScaleAspectFill, // 这是整个view会被图片填满，图片比例不变，这样图片显示就会大于view

3、Scale to Fill: 缩放图片,使图片充满容器。没有aspect，图片未必保持长宽比例协调，有可能会拉伸至变形。

  4、 UIViewContentModeCenter  中间为中心

5、UIViewContentModeTop 以上面为主

6、UIViewContentModeBottom 以下面为主

7、UIViewContentModeLeft 以左边为主

8、UIViewContentModeRight

9、UIViewContentModeTopLeft

10、UIViewContentModeTopRight

11、UIViewContentModeBottomLeft

12、UIViewContentModeBottomRight

13、UIViewContentModeLeft

14、UIViewContentModeLeft

15、UIViewContentModeLeft

10、’-[__NSCFString objectForKeyedSubscript:]: unrecognized selector sent to instance 0x102288570’

报错信息如下：

2017-12-28 19:38:14.259 SwiftLive[1327:1606209] <Unknown>: [BLYLog]  Trapped uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString objectForKeyedSubscript:]: unrecognized selector sent to instance 0x102288570' 
(
    0   CoreFoundation                      0x0000000186d461d8 <redacted> + 148
    1   libobjc.A.dylib                     0x000000018578055c objc_exception_throw + 56
    2   CoreFoundation                      0x0000000186d4d278 <redacted> + 0
    3   CoreFoundation                      0x0000000186d4a278 <redacted> + 916
    4   CoreFoundation                      0x0000000186c4459c _CF_forwarding_prep_0 + 92
    5   SwiftLive                           0x00000001001a1e3c -[FLAttentionViewController collectionView:didSelectItemAtIndexPath:] + 476
    6   UIKit                               0x000000018cdb9ad4 <redacted> + 596
    7   UIKit                               0x000000018cdb9468 <redacted> + 596
    8   UIKit                               0x000000018cd34e84 <redacted> + 336
    9   UIKit                               0x000000018cd7f500 <redacted> + 60
    10  UIKit                               0x000000018cd34e84 <redacted> + 336
    11  UIKit                               0x000000018cd7f500 <redacted> + 60
    12  UIKit                               0x000000018cd34e84 <redacted> + 336
    13  UIKit                               0x000000018cd7f500 <redacted> + 60
    14  UIKit                               0x000000018d166c90 <redacted> + 4484
    15  UIKit                               0x000000018d162d28 <redacted> + 1164
    16  UIKit                               0x000000018d162848 <redacted> + 408
    17  UIKit                               0x000000018d161b04 <redacted> + 268
    18  UIKit                               0x000000018cbd0a44 <redacted> + 2960
    19  UIKit                               0x000000018cba152c <redacted> + 340
    20  UIKit                               0x000000018d38ea54 <redacted> + 2736
    21  UIKit                               0x000000018d3884bc <redacted> + 784
    22  CoreFoundation                      0x0000000186cf4278 <redacted> + 24
    23  CoreFoundation                      0x0000000186cf3bc0 <redacted> + 524
    24  CoreFoundation                      0x0000000186cf17c0 <redacted> + 804
    25  CoreFoundation                      0x0000000186c20048 CFRunLoopRunSpecific + 444
    26  GraphicsServices                    0x00000001886a6198 GSEventRunModal + 180
    27  UIKit                               0x000000018cc0c2fc <redacted> + 684
    28  UIKit                               0x000000018cc07034 UIApplicationMain + 208
    29  SwiftLive                           0x000000010037b6d0 main + 312
    30  libdyld.dylib                       0x0000000185c045b8 <redacted> + 4
)

刚一开始看，以为是数据解析错误，但是明明是看着打印出的数据解析的，没有问题啊，郁闷的宝宝又去找师傅，师父说，肯定是你没字典转模型啊

确实，后台返的数组里面嵌套有字典，然后忘了写：

- (void)setValue:(id)value forKey:(NSString *)key
{
    if ([key isEqualToString:@"live_info"])
    {
        [super setValue:value forKey:key];
    }else
    {
        NSString *string = [NSString stringWithFormat:@"%@", value];
        [super setValue:string forKey:key];
    }
}

师父果然腻害，笨笨的我，总是丢三落四

11、大家新年快乐，今天继续上班，遇到了一个小小的问题：

*** -[__NSArrayM insertObject]: object cannot be nil

2018-01-02 14:43:32.923 SwiftLive[1046:427525] <Unknown>: [BLYLog]  Trapped uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil' 
(
    0   CoreFoundation                      0x0000000181f2aff8 <redacted> + 148
    1   libobjc.A.dylib                     0x000000018098c538 objc_exception_throw + 56
    2   CoreFoundation                      0x0000000181e0c898 CFStringConvertNSStringEncodingToEncoding + 0
    3   SwiftLive                           0x000000010018e110 -[FLRefreshHeaderView imagesArr] + 336
    4   SwiftLive                           0x000000010018e684 -[FLRefreshHeaderView setRefreshState:] + 60
    5   SwiftLive                           0x000000010018da74 -[FLRefreshHeaderView refreshView] + 792
    6   SwiftLive                           0x000000010018f178 -[FLRefreshHeaderView setState:] + 1516
    7   SwiftLive                           0x00000001007c1aa0 -[MJRefreshComponent initWithFrame:] + 200
    8   SwiftLive                           0x000000010018d700 -[FLRefreshHeaderView init] + 76
    9   SwiftLive                           0x00000001007c524c +[MJRefreshHeader headerWithRefreshingTarget:refreshingAction:] + 92
    10  SwiftLive                           0x000000010021bd20 -[FLLiveListViewController setUpRefreshView] + 88
    11  SwiftLive                           0x000000010021bb40 -[FLLiveListViewController viewDidLoad] + 876
    12  UIKit                               0x000000018805cb04 <redacted> + 1036
    13  UIKit                               0x000000018805c6e0 <redacted> + 28
    14  SwiftLive                           0x000000010012b0ec -[FLHomeViewController collectionView:cellForItemAtIndexPath:] + 436
    15  UIKit                               0x00000001889564a0 <redacted> + 448
    16  UIKit                               0x00000001880bd3f0 <redacted> + 3820
    17  UIKit                               0x00000001880b8018 <redacted> + 300
    18  UIKit                               0x0000000188059cc0 <redacted> + 1200
    19  QuartzCore                          0x000000018524a274 <redacted> + 148
    20  QuartzCore                          0x000000018523ede8 <redacted> + 292
    21  QuartzCore                          0x000000018523eca8 <redacted> + 32
    22  QuartzCore                          0x00000001851ba34c <redacted> + 252
    23  QuartzCore                          0x00000001851e13ac <redacted> + 504
    24  UIKit                               0x00000001882f4840 <redacted> + 140
    25  CoreFoundation                      0x0000000181ed930c <redacted> + 20
    26  CoreFoundation                      0x0000000181ed8b28 <redacted> + 288
    27  CoreFoundation                      0x0000000181ed6998 <redacted> + 728
    28  CoreFoundation                      0x0000000181e06da4 CFRunLoopRunSpecific + 424
    29  GraphicsServices                    0x0000000183871074 GSEventRunModal + 100
    30  UIKit                               0x00000001880c1c9c UIApplicationMain + 208
    31  SwiftLive                           0x000000010044771c main + 312
    32  libdyld.dylib                       0x0000000180e1559c <redacted> + 4
)

这个出错的原因主要是，我们的一个帧动画需要替换，UI直接用我原来的图的名称命名的，便于我替换，不过帧的多少是不一样的，我把图片直接拉进去，代码里面的帧数改了，多余的帧的图片却忘记拉进项目，找不到对应的图，自然崩溃

12、-[__NSCFNumber length]: unrecognized selector sent to instance 0xb000000000000643

2018-01-03 14:39:38.703 SwiftLive[1681:2148751] <Unknown>: [BLYLog]  Trapped uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFNumber length]: unrecognized selector sent to instance 0xb000000000000643' 
(
    0   CoreFoundation                      0x0000000186d461d8 <redacted> + 148
    1   libobjc.A.dylib                     0x000000018578055c objc_exception_throw + 56
    2   CoreFoundation                      0x0000000186d4d278 <redacted> + 0
    3   CoreFoundation                      0x0000000186d4a278 <redacted> + 916
    4   CoreFoundation                      0x0000000186c4459c _CF_forwarding_prep_0 + 92
    5   UIKit                               0x000000018cbab7bc <redacted> + 108
    6   UIKit                               0x000000018cbab6b4 <redacted> + 128
    7   UIKit                               0x000000018cca1afc <redacted> + 96
    8   UIKit                               0x000000018cca18f0 <redacted> + 52
    9   UIKit                               0x000000018cca1458 <redacted> + 488
    10  UIKit                               0x000000018d4f3b78 <redacted> + 76
    11  UIKit                               0x000000018d4f289c <redacted> + 192
    12  UIKit                               0x000000018d4f2be4 <redacted> + 632
    13  UIKit                               0x000000018d4f2b6c <redacted> + 512
    14  UIKit                               0x000000018d4f2b6c <redacted> + 512
    15  UIKit                               0x000000018d4f2b6c <redacted> + 512
    16  UIKit                               0x000000018d4f2b6c <redacted> + 512
    17  UIKit                               0x000000018d4f2b6c <redacted> + 512
    18  UIKit                               0x000000018d4f2b6c <redacted> + 512
    19  Foundation                          0x0000000187775480 <redacted> + 168
    20  UIKit                               0x000000018d4f338c <redacted> + 84
    21  UIKit                               0x000000018d4f254c <redacted> + 136
    22  UIKit                               0x000000018d4f2f94 <redacted> + 164
    23  UIKit                               0x000000018d4f3f00 <redacted> + 364
    24  UIKit                               0x000000018ce9add4 <redacted> + 180
    25  UIKit                               0x000000018cb9e220 <redacted> + 1196
    26  QuartzCore                          0x000000018a05e188 <redacted> + 148
    27  QuartzCore                          0x000000018a052e64 <redacted> + 292
    28  QuartzCore                          0x000000018a052d24 <redacted> + 32
    29  QuartzCore                          0x0000000189fcf7ec <redacted> + 252
    30  QuartzCore                          0x0000000189ff6c58 <redacted> + 512
    31  QuartzCore                          0x0000000189ff7678 <redacted> + 120
    32  CoreFoundation                      0x0000000186cf37dc <redacted> + 32
    33  CoreFoundation                      0x0000000186cf140c <redacted> + 372
    34  CoreFoundation                      0x0000000186cf189c <redacted> + 1024
    35  CoreFoundation                      0x0000000186c20048 CFRunLoopRunSpecific + 444
    36  GraphicsServices                    0x00000001886a6198 GSEventRunModal + 180
    37  UIKit                               0x000000018cc0c2fc <redacted> + 684
    38  UIKit                               0x000000018cc07034 UIApplicationMain + 208
    39  SwiftLive                           0x00000001003f7454 main + 312
    40  libdyld.dylib                       0x0000000185c045b8 <redacted> + 4
)

每次从后台拿到值的时候，总忘判断后天传过来的值的类型，呢，又出错了，后台的给我的是长整型的变量，我赋值给了string类型。

13、the view returned from -collectionViewatIndexPath (UICollectionElementKindSectionHeader, {length = 2, path = 0 - 0}) was not retrieved by calling -dequeueReusableSupplementaryViewOfKindforIndexPath: or is nil ((null))

2018-01-03 16:00:21.895 SwiftLive[1712:2166430] <Unknown>: [BLYLog]  Trapped uncaught exception 'NSInternalInconsistencyException', reason: 'the view returned from -collectionView:viewForSupplementaryElementOfKind:atIndexPath (UICollectionElementKindSectionHeader,<NSIndexPath: 0xc000000000000016> {length = 2, path = 0 - 0}) was not retrieved by calling -dequeueReusableSupplementaryViewOfKind:withReuseIdentifier:forIndexPath: or is nil ((null))' 
(
    0   CoreFoundation                      0x0000000186d461d8 <redacted> + 148
    1   libobjc.A.dylib                     0x000000018578055c objc_exception_throw + 56
    2   CoreFoundation                      0x0000000186d46094 <redacted> + 0
    3   Foundation                          0x00000001877d379c <redacted> + 112
    4   UIKit                               0x000000018cd24044 <redacted> + 932
    5   UIKit                               0x000000018cc02678 <redacted> + 3868
    6   UIKit                               0x000000018cbfd0a4 <redacted> + 288
    7   UIKit                               0x000000018cb9e220 <redacted> + 1196
    8   QuartzCore                          0x000000018a05e188 <redacted> + 148
    9   QuartzCore                          0x000000018a052e64 <redacted> + 292
    10  QuartzCore                          0x000000018a052d24 <redacted> + 32
    11  QuartzCore                          0x0000000189fcf7ec <redacted> + 252
    12  QuartzCore                          0x0000000189ff6c58 <redacted> + 512
    13  QuartzCore                          0x0000000189ff7678 <redacted> + 120
    14  CoreFoundation                      0x0000000186cf37dc <redacted> + 32
    15  CoreFoundation                      0x0000000186cf140c <redacted> + 372
    16  CoreFoundation                      0x0000000186cf189c <redacted> + 1024
    17  CoreFoundation                      0x0000000186c20048 CFRunLoopRunSpecific + 444
    18  GraphicsServices                    0x00000001886a6198 GSEventRunModal + 180
    19  UIKit                               0x000000018cc0c2fc <redacted> + 684
    20  UIKit                               0x000000018cc07034 UIApplicationMain + 208
    21  SwiftLive                           0x0000000100397478 main + 312
    22  libdyld.dylib                       0x0000000185c045b8 <redacted> + 4
)

这个不是太确定，应该是要判断collectionView的header的section要确定下来，不能直接返回nil？有大神看到了帮忙解答下，蟹蟹。

14、-[__NSSingleObjectArrayI objectForKey:]: unrecognized selector sent to instance 0x174011cd0

2018-01-03 16:12:37.485 SwiftLive[1725:2170098] <Unknown>: [BLYLog]  Trapped uncaught exception 'NSInvalidArgumentException', reason: '-[__NSSingleObjectArrayI objectForKey:]: unrecognized selector sent to instance 0x174011cd0' 
(
    0   CoreFoundation                      0x0000000186d461d8 <redacted> + 148
    1   libobjc.A.dylib                     0x000000018578055c objc_exception_throw + 56
    2   CoreFoundation                      0x0000000186d4d278 <redacted> + 0
    3   CoreFoundation                      0x0000000186d4a278 <redacted> + 916
    4   CoreFoundation                      0x0000000186c4459c _CF_forwarding_prep_0 + 92
    5   Foundation                          0x00000001877ea800 <redacted> + 212
    6   SwiftLive                           0x000000010036ac88 -[FLDiscoveryViewController dealRequestDataErrorWithOffset:] + 1092
    7   SwiftLive                           0x000000010036a5c4 -[FLDiscoveryViewController refreshData] + 404
    8   SwiftLive                           0x00000001006eac0c __47-[MJRefreshComponent executeRefreshingCallback]_block_invoke + 372
    9   libdispatch.dylib                   0x0000000101f1925c _dispatch_call_block_and_release + 24
    10  libdispatch.dylib                   0x0000000101f1921c _dispatch_client_callout + 16
    11  libdispatch.dylib                   0x0000000101f1e284 _dispatch_main_queue_callback_4CF + 1200
    12  CoreFoundation                      0x0000000186cf3f2c <redacted> + 12
    13  CoreFoundation                      0x0000000186cf1b18 <redacted> + 1660
    14  CoreFoundation                      0x0000000186c20048 CFRunLoopRunSpecific + 444
    15  GraphicsServices                    0x00000001886a6198 GSEventRunModal + 180
    16  UIKit                               0x000000018cc0c2fc <redacted> + 684
    17  UIKit                               0x000000018cc07034 UIApplicationMain + 208
    18  SwiftLive                           0x000000010036f4a0 main + 312
    19  libdyld.dylib                       0x0000000185c045b8 <redacted> + 4
)

这里就狠坑啦，主要还是窝是个小白，应该是字典转模型的，但是我取出来的是数组，而不是字段，根据打印，一看就是数组，怎么会不蹦捏！

字典：

{
    avatar = "http://tx-upload.hk.ufileos.com/c229b79525a8a1e276d8e7c6817aab26.jpg";
    "avatar_small" = "http://tx-upload.hk.ufileos.com/cca6661843afcd4953539a0dc220da50.jpg";
    country = "";
    "create_time" = 1514957449;
    "current_count" = 0;
    "end_time" = 0;
    gender = 0;
    "great_sort" = 0;
    "hls_endpoint" = "http://hls.ylive.avazuinc.com:9090/hls/av3598/index.m3u8";
    "hot_sort" = 0;
    "like_sort" = 0;
    "live_id" = 3598;
    "live_pic" = "";
    "liver_exp" = 208080;
    "liver_grade" = 4;
    "liver_next_exp" = 319300;
    "new_sort" = 0;
    nick = test123;
    "people_count" = 300;
    signature = "";
    status = 2;
    "streaming_endpoint" = "rtmp://source.publish.olivestream.tv/live/av3598";
    title = "test123 on live";
    uid = 828;
    "update_time" = 1514957449;
    "viewing_endpoint" = "http://rtmp.pull.olivestream.tv/live/av3598.flv";
}

数组：

(
{
    avatar = "http://tx-upload.hk.ufileos.com/c229b79525a8a1e276d8e7c6817aab26.jpg";
    "avatar_small" = "http://tx-upload.hk.ufileos.com/cca6661843afcd4953539a0dc220da50.jpg";
    country = "";
    "create_time" = 1514957449;
    "current_count" = 0;
    "end_time" = 0;
    gender = 0;
    "great_sort" = 0;
    "hls_endpoint" = "http://hls.ylive.avazuinc.com:9090/hls/av3598/index.m3u8";
    "hot_sort" = 0;
    "like_sort" = 0;
    "live_id" = 3598;
    "live_pic" = "";
    "liver_exp" = 208080;
    "liver_grade" = 4;
    "liver_next_exp" = 319300;
    "new_sort" = 0;
    nick = test123;
    "people_count" = 300;
    signature = "";
    status = 2;
    "streaming_endpoint" = "rtmp://source.publish.olivestream.tv/live/av3598";
    title = "test123 on live";
    uid = 828;
    "update_time" = 1514957449;
    "viewing_endpoint" = "http://rtmp.pull.olivestream.tv/live/av3598.flv";
}
)

15、网络状态不好的时候，明明设置了刷新超时，却明显超过了自己设置的超时时间，还在加载QAQ

原来代码如下：

SouthEast 4

感谢师父告诉我，这样是不对滴，

timeoutInterval 已经没有了作用。不管是同步还是异步。

这个问题只有在3.0以及之后的os中才有的，而且只有在当调用了setHTTPBody之后才会出现timeout失效。这个是苹果公司对URL Loading System的在iOS3.0中的一个改动,所有要改代码：

[request setTimeoutInterval:10.0f];

改成

[self.manager.requestSerializer setTimeoutInterval:10.0f];

感谢师父！

16、-[__NSCFNumber boundingRectWithSizeattributes]: unrecognized selector sent to instance 0xb000000000d33a13

2018-01-04 21:03:39.929 SwiftLive[1935:2427284] <Unknown>: [BLYLog]  Trapped uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFNumber boundingRectWithSize:options:attributes:context:]: unrecognized selector sent to instance 0xb000000000d33a13' 
(
    0   CoreFoundation                      0x0000000186d461d8 <redacted> + 148
    1   libobjc.A.dylib                     0x000000018578055c objc_exception_throw + 56
    2   CoreFoundation                      0x0000000186d4d278 <redacted> + 0
    3   CoreFoundation                      0x0000000186d4a278 <redacted> + 916
    4   CoreFoundation                      0x0000000186c4459c _CF_forwarding_prep_0 + 92
    5   SwiftLive                           0x000000010023cb50 -[FLChatRoomInfoView stringRect:fontSize:constraintWidth:constraintHeight:] + 288
    6   SwiftLive                           0x00000001002354b0 -[FLChatRoomInfoView updateUIWithAnchor:liveRoomInfo:isFollow:] + 2736
    7   SwiftLive                           0x00000001001e1cd0 -[FLLiveMainInterfaceViewController setupContentView] + 3844
    8   SwiftLive                           0x00000001001dfe60 -[FLLiveMainInterfaceViewController setupUI] + 2708
    9   SwiftLive                           0x00000001001d8be0 -[FLLiveMainInterfaceViewController viewDidLoad] + 372
    10  UIKit                               0x000000018cba10b0 <redacted> + 1056
    11  UIKit                               0x000000018cbb8c44 <redacted> + 132
    12  UIKit                               0x000000018cd41190 <redacted> + 1136
    13  UIKit                               0x000000018cc59858 <redacted> + 676
    14  UIKit                               0x000000018cc594c0 <redacted> + 64
    15  UIKit                               0x000000018cc59424 <redacted> + 188
    16  UIKit                               0x000000018cb9e220 <redacted> + 1196
    17  QuartzCore                          0x000000018a05e188 <redacted> + 148
    18  QuartzCore                          0x000000018a052e64 <redacted> + 292
    19  QuartzCore                          0x000000018a052d24 <redacted> + 32
    20  QuartzCore                          0x0000000189fcf7ec <redacted> + 252
    21  QuartzCore                          0x0000000189ff6c58 <redacted> + 512
    22  QuartzCore                          0x0000000189ff7678 <redacted> + 120
    23  CoreFoundation                      0x0000000186cf37dc <redacted> + 32
    24  CoreFoundation                      0x0000000186cf140c <redacted> + 372
    25  CoreFoundation                      0x0000000186cf189c <redacted> + 1024
    26  CoreFoundation                      0x0000000186c20048 CFRunLoopRunSpecific + 444
    27  GraphicsServices                    0x00000001886a6198 GSEventRunModal + 180
    28  UIKit                               0x000000018cc0c2fc <redacted> + 684
    29  UIKit                               0x000000018cc07034 UIApplicationMain + 208
    30  SwiftLive                           0x000000010038e380 main + 312
    31  libdyld.dylib                       0x0000000185c045b8 <redacted> + 4
)

boundingRectWithSizeattributes

是计算字符串宽度的方法，而后台传过来的是nsnumber类型的，所以出错了，你没看错，我每天都在出错中度过

17、在 UIScrollView上面添加了一个View，点击View的时候，页面上滑了一下，测试过来提bug，emmmm，可是宝宝看了层级关系，没有可点击的东西啊，QAQ

   师父快来救我：

关于scrollView点击状态栏列表回到顶部的说明，想要禁用掉此功能将scrollsToTop属性设置为NO即可。

18、去除cell的点击后的选中背景：

方法一：自定义cell里面：

- (void)awakeFromNib {
    [super awakeFromNib];
    self.selectionStyle = UITableViewCellSelectionStyleNone;
}

方法二：设置tableView的allowsSelection属性注意:属性为NO的时候 tableView的代理方法:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 就不会执行 ,所以如果需要有cell点击事件的不要用此方法

tableView.allowsSelection = NO;

方法三：更改cell属性selectedBackgroundView 的背景色

我们选中cell时有灰色效果就是因为selectedBackgroundView这个家伙,所以,我们可以通过设置改View的背景色来改变选中颜色

self.selectedBackgroundView = [[UIView alloc] initWithFrame:cell.frame];  
self.selectedBackgroundView.backgroundColor = [UIColor redColor];

注意点:

1, 在storyboard设置tableView属性的时候如果这样设置 selection: NoSelection

会导致点击cell的时候没反应不会调用 didSelectRowAtIndexPath 方法

要想有点击方法应设置成 selection: SingleSelection

19、-[__NSCFNumber length]: unrecognized selector sent to instance 0xb000000000000033

2018-01-18 18:17:17.217 SwiftLive[1168:493865] <Unknown>: [BLYLog]  Trapped uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFNumber length]: unrecognized selector sent to instance 0xb000000000000033' 
(
    0   CoreFoundation                      0x00000001818a2ff8 <redacted> + 148
    1   libobjc.A.dylib                     0x0000000180304538 objc_exception_throw + 56
    2   CoreFoundation                      0x00000001818a9ef4 <redacted> + 0
    3   CoreFoundation                      0x00000001818a6f54 <redacted> + 916
    4   CoreFoundation                      0x00000001817a2d4c _CF_forwarding_prep_0 + 92
    5   UIKit                               0x00000001879de58c <redacted> + 108
    6   UIKit                               0x00000001879de484 <redacted> + 124
    7   UIKit                               0x0000000187ad29c0 <redacted> + 272
    8   UIKit                               0x0000000187ad2704 <redacted> + 52
    9   UIKit                               0x0000000187ad2230 <redacted> + 488
    10  UIKit                               0x0000000188335ca0 <redacted> + 112
    11  UIKit                               0x000000018833492c <redacted> + 192
    12  UIKit                               0x0000000188334c74 <redacted> + 624
    13  UIKit                               0x0000000188334bfc <redacted> + 504
    14  UIKit                               0x0000000188334bfc <redacted> + 504
    15  UIKit                               0x0000000188334bfc <redacted> + 504
    16  UIKit                               0x0000000188334bfc <redacted> + 504
    17  UIKit                               0x0000000188334bfc <redacted> + 504
    18  UIKit                               0x0000000188334bfc <redacted> + 504
    19  UIKit                               0x0000000188334bfc <redacted> + 504
    20  Foundation                          0x00000001822dca7c <redacted> + 168
    21  UIKit                               0x0000000188335410 <redacted> + 88
    22  UIKit                               0x0000000188334340 <redacted> + 116
    23  UIKit                               0x0000000188335024 <redacted> + 164
    24  UIKit                               0x0000000188336070 <redacted> + 432
    25  UIKit                               0x00000001879e596c <redacted> + 892
    26  SwiftLive                           0x000000010022f88c __69-[FLLiveMainInterfaceViewController showDialogWithUserInfo:withType:]_block_invoke.1225 + 84
    27  UIKit                               0x0000000187a093dc <redacted> + 644
    28  UIKit                               0x0000000187b4da24 <redacted> + 100
    29  SwiftLive                           0x000000010022f518 -[FLLiveMainInterfaceViewController showDialogWithUserInfo:withType:] + 620
    30  SwiftLive                           0x0000000100234a58 -[FLLiveMainInterfaceViewController chatMessageShowUserDetail:withType:] + 84
    31  SwiftLive                           0x00000001000f3cb4 -[FLChatMessageView getUserDetails:] + 1920
    32  SwiftLive                           0x00000001000f3ef0 -[FLChatMessageView showUserInfo:] + 444
    33  UIKit                               0x0000000187fa5d38 <redacted> + 64
    34  UIKit                               0x0000000187fa956c <redacted> + 124
    35  UIKit                               0x0000000187b63470 <redacted> + 252
    36  UIKit                               0x0000000187a05380 <redacted> + 720
    37  UIKit                               0x0000000187f99810 <redacted> + 988
    38  UIKit                               0x0000000187f993e0 <redacted> + 404
    39  UIKit                               0x0000000187f9868c <redacted> + 268
    40  UIKit                               0x0000000187a0370c <redacted> + 3164
    41  UIKit                               0x00000001879d433c <redacted> + 340
    42  UIKit                               0x00000001881ce014 <redacted> + 2400
    43  UIKit                               0x00000001881c8770 <redacted> + 4268
    44  UIKit                               0x00000001881c8b9c <redacted> + 148
    45  CoreFoundation                      0x000000018185142c <redacted> + 24
    46  CoreFoundation                      0x0000000181850d9c <redacted> + 540
    47  CoreFoundation                      0x000000018184e9a8 <redacted> + 744
    48  CoreFoundation                      0x000000018177eda4 CFRunLoopRunSpecific + 424
    49  GraphicsServices                    0x00000001831e8074 GSEventRunModal + 100
    50  UIKit                               0x0000000187a39058 UIApplicationMain + 208
    51  SwiftLive                           0x00000001003dc848 main + 312
    52  libdyld.dylib                       0x000000018078d59c <redacted> + 4
)