ios html阅读器,iOS加载Html文本

今天药忘吃喽~ 2021-09-08 06:36 378阅读 0赞

UILable||UITextView加载html

使用UILable或TextView比较方便，但是字体样式无法保证，推荐使用下面的UIWebView加载

UITextView \*titleTexV;

\- (void)setTitleStr:(NSString \*)titleStr\{

\_titleStr = titleStr;

//添加行间距，不过没用

self.attriStr = \[self setHotSpotWithString:\_titleStr\];

//赋值

self.titleTexV.attributedText = self.attriStr;

//计算html文本高度

CGFloat desHeight = \[self.attriStr boundingRectWithSize:CGSizeMake(SCREEN\_WIDTH, CGFLOAT\_MAX) options:NSStringDrawingUsesLineFragmentOrigin context:nil\].size.height;

self.footerDesHeight = 50+desHeight;

//更新布局

\[\_titleTexV mas\_updateConstraints:^(MASConstraintMaker \*make) \{

make.height.mas\_equalTo(desHeight);

\}\];

//添加行间距等样式

\- (NSMutableAttributedString \*)setHotSpotWithString:(NSString \*)str\{

NSMutableParagraphStyle \*paragraphStyle = \[\[NSMutableParagraphStyle alloc\]init\];

\[paragraphStyle setLineSpacing:4\*layoutBy6()\];

NSDictionary \*attDic = @\{NSFontAttributeName : \[UIFont systemFontOfSize:12\*layoutBy6()\],

NSParagraphStyleAttributeName : paragraphStyle,

NSForegroundColorAttributeName:hexStringToColor(@"999999"),

NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType

\};

NSMutableAttributedString \*lastStr = \[\[NSMutableAttributedString alloc\]initWithData:\[str dataUsingEncoding:NSUnicodeStringEncoding\] options:attDic documentAttributes:nil error:nil\];

return lastStr;

WebView加载

typedef void(^DescriptionBlock)(void);

@property (nonatomic , copy) NSString \*desStr; //赋值的Html文本

@property (nonatomic , assign) CGFloat cellHeight; //需要返回给View的

@property (nonatomic , copy) DescriptionBlock myBlock; //Block回调

/-----------------------------------------------------------------------/

\- (void)webViewDidFinishLoad:(UIWebView \*)webView \{

//加载完成后获取WebView实际高度

CGFloat webViewHeight = \[\[webView stringByEvaluatingJavaScriptFromString:@"document.body.scrollHeight"\] floatValue\];

webView.frame = CGRectMake(0, 0, SCREEN\_WIDTH, webViewHeight);

//赋值并回调需要的cellHeight

self.cellHeight = webViewHeight;

if (self.myBlock) \{

self.myBlock();

\-(void)setDesStr:(NSString \*)desStr \{

\_desStr = desStr;

//移除所有视图

\[self.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)\];

//添加WebView 注:这里的Frame高度必须赋值

UIWebView \*webView = \[\[UIWebView alloc\]initWithFrame:CGRectMake(0, 0, SCREEN\_WIDTH, 1)\];

webView.scrollView.scrollEnabled = NO;

webView.delegate =self;

\[webView sizeToFit\];

\[self addSubview:webView\];

//加载Html文件

\[webView loadHTMLString:desStr baseURL:nil\];

//外部调用：

\- (ChooseGradeFooterDesView \*)footerDesV\{

if (!\_footerDesV) \{

\_footerDesV = \[\[ChooseGradeFooterDesView alloc\]init\];

\_\_weak typeof(self) weakSelf = self;

\_footerDesV.myBlock = ^\{

\[self.tableView reloadSections:\[NSIndexSet indexSetWithIndex:0\] withRowAnimation:UITableViewRowAnimationNone\];

\};

return \_footerDesV;

其它关于计算文本高度 || 正则去除标签的方法

//计算文本size

\- (CGSize)getSizeWithStr:(NSString \*)str Font:(float)font viewWidth:(CGFloat)widht\{

NSString \*string = \[self getZZwithString:str\];

//加行间距

NSMutableParagraphStyle \*paragraphStyle = \[\[NSMutableParagraphStyle alloc\]init\];

\[paragraphStyle setLineSpacing:4\*layoutBy6()\];

NSDictionary \*dic = @\{NSFontAttributeName:\[UIFont systemFontOfSize:font\], NSParagraphStyleAttributeName:paragraphStyle\};

CGSize sizeO = \[string boundingRectWithSize:CGSizeMake(widht, 20000) options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil\].size;

return sizeO;

//正则去除网络标签

\-(NSString \*)getZZwithString:(NSString \*)string\{

NSRegularExpression \*regularExpretion=\[NSRegularExpression regularExpressionWithPattern:@"\]\*>|\\n"

options:0

error:nil\];

string=\[regularExpretion stringByReplacingMatchesInString:string options:NSMatchingReportProgress range:NSMakeRange(0, string.length) withTemplate:@""\];

return string;