UILabel在设置了行间距和字间距后计算高度

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- (CGFloat)textHeightFromTextString:(NSString *)text width:(CGFloat)textWidth fontSize:(CGFloat)textSize {
    
    //设置行间距
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    [paragraphStyle setLineSpacing:3];
    
    //把行间距和字间距加入高度计算的方法
    NSDictionary*attrs =@{NSFontAttributeName: [UIFont systemFontOfSize:textSize],NSParagraphStyleAttributeName:paragraphStyle,NSKernAttributeName:@1.5f};
    
    CGRect rect = [text boundingRectWithSize:CGSizeMake(textWidth, MAXFLOAT) options:NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesFontLeading|NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingTruncatesLastVisibleLine attributes:attrs context:nil];
    
    //返回计算出的行高
    return ceilf(rect.size.height);
}
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UILabel *msgLab = [[UILabel alloc] initWithFrame:CGRectMake(15, 10, frame.size.width-30, 100)];
        msgLab.backgroundColor = [UIColor clearColor];
msgLab.textColor = [[UIColor whiteColor] colorWithAlphaComponent:.8]; 
msgLab.numberOfLines = 0;
        msgLab.lineBreakMode = NSLineBreakByWordWrapping;
        NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:[bannerDic objectForKey:@"msgText"]];
        
        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
        [paragraphStyle setLineSpacing:3];//调整行间距
        //这个设置在字体无法显示时一省略号表示
        paragraphStyle.lineBreakMode = NSLineBreakByTruncatingTail;
        
        [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [attributedString length])];
        
        [attributedString addAttribute:NSFontAttributeName value:msgFont range:NSMakeRange(0, attributedString.length)];
        msgLab.attributedText = attributedString;
        [self addSubview:msgLab];