动态设置webView,Label高度

动态计算web高度，代理方法里

-(void)webViewDidFinishLoad:(UIWebView *)webView
{
    CGFloat webViewHeight=[webView.scrollView contentSize].height;
    CGRect newFrame = webView.frame;
    newFrame.size.height = webViewHeight;
    webView.frame = newFrame;
 }

内容所占长度，CGSizeMake(Label宽度, 最大高度)，lineBreakMode是文字换行模式

        CGSize titleSize = [note sizeWithFont:[UIFont systemFontOfSize:15] constrainedToSize:CGSizeMake(209, 1000) lineBreakMode:UILineBreakModeWordWrap];

动态计算Label高度

NSString *str ;
CGRect rect = self.rejectInfo.frame;
NSDictionary *arrts = @{NSFontAttributeName : [UIFont systemFontOfSize:15.0]};
rect.size.height = [str boundingRectWithSize:CGSizeMake(WIDTH-30, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:arrts context:nil].size.height;
self.rejectInfo.frame = rect;
//顺畅显示中文加英文,设置换行模式
self.rejectInfo.lineBreakMode = NSLineBreakByCharWrapping;
self.rejectInfo.text = str;