iOS-夜间模式(换肤设置)

浅浅的花香味﹌ 2022-05-31 08:58 231阅读 0赞

# 概述 #

iOS 开发中有时候会有夜间模式(换肤设置)的需求, 主要是更改相关颜色操作每次切换夜间/白天模式时，都会发出通知给所有ViewController，让它们切换到相应的主题.

# 详细 #

#### 代码下载：[http://www.demodashi.com/demo/10668.html][http_www.demodashi.com_demo_10668.html] ####

####    一、实现功能及主要思路 ####

实现功能:

iOS 开发中有时候会有夜间模式(换肤设置)的需求, 其实主要是更改相关颜色操作.每次切换夜间/白天模式时，都会发出通知给所有ViewController，让它们切换到相应的主题.

主要思路:

1. 创建一个管理模式主题的单例管理类ThemeManage

2. 封装好需要做夜间模式变色处理的控件扩展:UIView (ThemeChange), UINavigationBar (ThemeChange), UITabBar (ThemeChange), UILabel (ThemeChange), UIButton (ThemeChange)

3. 在 AppDelegate里先获取夜间模式状态, 根控制器里先设置tabBar 及 子控制器里navigationBar的夜间模式状态

4. 添加控制白天/黑夜模式item,发通知切换相对应i模式及image

5. 添加相关控件是否黑夜模式下已更换字色和背景色

#### 二、程序实现 ####

Step1. 创建一个管理模式主题的单例管理类

ThemeManage.h 文件里添加模式管理单例:

// 是否是夜间 YES表示夜间, NO为正常
    @property(nonatomic, assign) BOOL isNight;
    /**
     * 模式管理单例
     */
    + (ThemeManage *)shareThemeManage;

ThemeManage. m 文件:

单例的初始化:

+ (ThemeManage *)shareThemeManage {
        
        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            themeManage = [[ThemeManage alloc] init];
        });
        return themeManage;
    }

重写isNight的set方法 (是否是夜间 YES表示夜间, NO为正常)

- (void)setIsNight:(BOOL)isNight {
        
        _isNight = isNight;
        
        if (self.isNight) { // 夜间模式改变相关颜色
            
            self.bgColor = [UIColor colorWithRed:0.06 green:0.08 blue:0.1 alpha:1];
            self.textColor = [UIColor whiteColor];
            self.color1 = [UIColor colorWithRed:0.08 green:0.11 blue:0.13 alpha:1];
            self.navBarColor = [UIColor whiteColor];
            self.color2 = [UIColor colorWithRed:0.2 green:0.31 blue:0.43 alpha:1];
            self.textColorGray = [UIColor whiteColor];
        } else{
            
            self.bgColor = [UIColor whiteColor];
            self.textColor = [UIColor blackColor];
            self.color1 = [UIColor colorWithRed:0.06 green:0.25 blue:0.48 alpha:1];
            self.navBarColor = [UIColor colorWithRed:0.31 green:0.73 blue:0.58 alpha:1];
            self.color2 = [UIColor colorWithRed:0.57 green:0.66 blue:0.77 alpha:1];
            self.textColorGray = [UIColor grayColor];
        }
        
        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            self.colorClear = [UIColor clearColor];
        });
    }

Step2. 封装好需要做夜间模式变色处理的控件扩展

一般需要UIView (ThemeChange), UINavigationBar (ThemeChange), UITabBar (ThemeChange), UILabel (ThemeChange), UIButton (ThemeChange);

详情见 Demo, 这里拿 UIView 做例子:

添加颜色状态枚举值 颜色的定义(一个代表一套):

typedef NS_ENUM(NSInteger, UIViewColorType) {
        UIViewColorTypeNormal, // 白天白色, 夜间黑色
        UIViewColorType1, // 白天蓝色, 夜间深灰
        UIViewColorType2, // 白天浅蓝, 夜间浅蓝
        UIViewColorTypeClear // 透明状态
    };

添加type的set,get方法:

- (void)setType:(id)type {
        
        objc_setAssociatedObject(self, @selector(type), type, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    }
    - (id)type {
        return objc_getAssociatedObject(self, @selector(type));
    }

开始监听:

- (void)startMonitor {
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeColor) name:@"changeColor" object:nil];
    }

改变颜色:

- (void)changeColor {
        // type为NSNumber型, 变为NSInteger
        switch ([self.type integerValue]) {
            case UIViewColorTypeNormal:
                self.backgroundColor = [ThemeManage shareThemeManage].bgColor;
                break;
            case UIViewColorType1:
                self.backgroundColor = [ThemeManage shareThemeManage].color1;
                break;
            case UIViewColorType2:
                self.backgroundColor = [ThemeManage shareThemeManage].color2;
                break;
            case UIViewColorTypeClear:
                self.backgroundColor = [ThemeManage shareThemeManage].colorClear;
                break;
                
            default:
                break;
        }
        
    }

设置颜色类型和对应颜色:

- (void)NightWithType:(UIViewColorType)type {
        
        self.type = [NSNumber numberWithInteger:type];
        [self changeColor];
        [self startMonitor];
        
        // 调用设置字体颜色的方法
        [self initTextColor];
    }

改变字体颜色的方法, 空方法, 可以在子类中重写这个方法来改变颜色(例如:Label):

- (void)initTextColor {
        
    }

Step3. 在 AppDelegate里先获取夜间模式状态, 根控制器里先设置tabBar 及 子控制器里navigationBar的夜间模式状态

#import "ThemeManage.h"
    #import "UIView+ThemeChange.h"

获取夜间模式状态:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
        
        // 获取夜间模式状态
        [ThemeManage shareThemeManage].isNight = [[NSUserDefaults standardUserDefaults] boolForKey:@"night"];
        
        self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
        self.window.backgroundColor = [UIColor whiteColor];
        [self.window makeKeyAndVisible];
        
        RootViewController *rootVc = [[RootViewController alloc] init];
        self.window.rootViewController = rootVc;
        
        return YES;
    }

RootViewController.m 文件里设置navigationBar的夜间模式状态:

- (void)viewDidLoad {
        [super viewDidLoad];
        
        [self.view NightWithType:UIViewColorTypeNormal];
        
        HomeViewController *vc = [[HomeViewController alloc] init];
        UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc];
        // 设置navigationBar的夜间模式状态
        [nav.navigationBar NightWithType:UIViewColorTypeNormal];
        vc.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"首页" image:[UIImage imageNamed:@"home"] tag:10];
        
        SchemaViewController *secondVC = [[SchemaViewController alloc] init];
        UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:secondVC];
        // 设置navigationBar的夜间模式状态
        [nav1.navigationBar NightWithType:UIViewColorTypeNormal];
        secondVC.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"菜单" image:[UIImage imageNamed:@"schema"] tag:11];
        
        [self.tabBar NightWithType:UIViewColorTypeNormal];
        self.viewControllers = @[nav, nav1];
        self.tabBar.translucent = NO;
        [[UINavigationBar appearance] setTranslucent:NO];
    }

Step4. 添加控制白天/黑夜模式item,发通知切换相对应i模式及image

[self.view NightWithType:UIViewColorTypeNormal];
        
        UIImage *barButtonImage = [ThemeManage shareThemeManage].isNight ? [UIImage imageNamed:@"night"] : [UIImage imageNamed:@"day"];
        self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithImage:barButtonImage style:UIBarButtonItemStylePlain target:self action:@selector(rightBarBtnAction:)];

Action点击动作事件(切换夜间模式):

- (void)rightBarBtnAction:(UIBarButtonItem *)barButton {
        
        [ThemeManage shareThemeManage].isNight = ![ThemeManage shareThemeManage].isNight;
        [[NSNotificationCenter defaultCenter] postNotificationName:@"changeColor" object:nil];
        [[NSUserDefaults standardUserDefaults] setBool:[ThemeManage shareThemeManage].isNight forKey:@"night"];
        UIImage *barBtnImage = [ThemeManage shareThemeManage].isNight ? [UIImage imageNamed:@"night"] : [UIImage imageNamed:@"day"];
        [barButton setImage:barBtnImage];
    }

发了通知不要忘记移除监听:

- (void)dealloc {
        // 移除监听
        [[NSNotificationCenter defaultCenter] removeObserver:self];
    }

Step5. 添加相关控件是否黑夜模式下已更换字色和背景色

#import "UILabel+ThemeChange.h"

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(100, 100, 200, 40)];
        label.text = @"测试看看字色及背景色";
        [label NightWithType:UIViewColorTypeNormal];
        [label NightTextType:LabelColorGray];
        [self.view addSubview:label];

#### 三、项目截图及运行效果 ####

项目截图:

![D4E7C60D-D933-4F01-B306-C17B19A81617.png][]

![E400F0A1-F882-4AE4-B032-F46A53A3F32E.png][]

这时候测试下, 看下运行效果:

![夜间模式.gif][.gif]

夜间模式对比截图:

![EA21E87F-09B2-4996-BAEB-FD2C819827B5.png][]

#### 四、其他补充 ####

界面性问题可以根据自己项目需求调整即可, 具体可参考代码, 项目能够直接运行!

#### 注：本文著作权归作者，由demo大师（[http://www.demodashi.com][http_www.demodashi.com]）宣传，拒绝转载，转载需要作者授权 ####

[http_www.demodashi.com_demo_10668.html]: http://www.demodashi.com/demo/10668.html
[D4E7C60D-D933-4F01-B306-C17B19A81617.png]: /images/20220531/0c2b6bea68434dcf9ac30efa6577f8f0.png
[E400F0A1-F882-4AE4-B032-F46A53A3F32E.png]: /images/20220531/c24188b8f01c442587799255698a6af8.png
[.gif]: /images/20220531/f2b5cedada3c4c99b2e2b5be0f3e1e9c.png
[EA21E87F-09B2-4996-BAEB-FD2C819827B5.png]: /images/20220531/1ab0f1ec6e9b41a29212c85471b3e26a.png
[http_www.demodashi.com]: http://www.demodashi.com/