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UILabel 根据text的内容来调整大小

有时候,在UILabel的text过长的时候,我们需要让label进行自适应大小,之前我们必须要获得这个UILabel的size,这便是根据text的内容和性质(字体,行间距等决定的)。 
 
在ios7中,使用boundingRectWithRect方法来获得CGSize:
 
 
 
//文字的字体NSDictionary *attribute = @{NSFontAttributeName:[UIFont fontWithName:@"Heiti SC" size:15.0f]}; //将text转化为NSMutableAttributedString类型NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:_titleLabel.text attributes:attribute]; //设置行间距NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];[paragraphStyle setLineSpacing:6.0f];[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [_titleLabel.text length])]; //获得UILabel的size,其中,296和93是size的限定值CGSize DateSize = [attributedString boundingRectWithSize:CGSizeMake(296, 93) options: NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading  context:nil].size;    //如果UILabel的宽度太宽的话if (DateSize.width > 518.0f/2) {     _titleLabel.size = CGSizeMake(296.0f, DateSize.height);    _titleLabel.textAlignment = NSTextAlignmentLeft;    _titleLabel.lineBreakMode = NSLineBreakByCharWrapping;    _titleLabel.numberOfLines = 0;  //不限定行数,自动换行    _titleLabel.attributedText = attributedString;}