用UIWebview、UILabeL、UITextView加载html富文本，图片太大显示不全的解决

（1）用UIWebview加载

// 自适应尺寸大小
- (NSString *)autoWebAutoImageSize:(NSString *)html{
    //搜索标签文本中的标签
    NSString * regExpStr = @"";
    NSRegularExpression *regex=[NSRegularExpression regularExpressionWithPattern:regExpStr options:NSRegularExpressionCaseInsensitive error:nil];
    
    NSArray *matches=[regex matchesInString:html
                                    options:0
                                      range:NSMakeRange(0, [html length])];
    
    
    NSMutableArray * mutArray = [NSMutableArray array];
    for (NSTextCheckingResult *match in matches) {
        NSString* group1 = [html substringWithRange:[match rangeAtIndex:1]];
        [mutArray addObject: group1];
    }
    
    NSUInteger len = [mutArray count];
    for (int i = 0; i < len; ++ i) {
        //在img标签内添加style,设置image的宽度,高度
        NSString *imageStr = [mutArray[i] stringByAppendingString:@" style=\"width:100%; height:auto;\""];
        
        html = [html stringByReplacingOccurrencesOfString:mutArray[i] withString:imageStr];
        
    }
    
    return html;
}

（2）用UITextView(UILabeL)加载

- (NSAttributedString *)showAttributedToHtml:(NSString *)html withWidth:(float)width{
    //替换图片的高度为屏幕的高度
    //width为UITextView的宽度
    
    NSString *str = [NSString stringWithFormat:@"%@",width,html];
    
    NSAttributedString *attributeString=[[NSAttributedString alloc] initWithData:[str dataUsingEncoding:NSUnicodeStringEncoding] options:@{NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType} documentAttributes:nil error:nil];
    
    
    return attributeString;
    
}