iOS label自适应高度(宽度)

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/// label自适应高度(一定要保持字体大小一致, numberOfLines为0, 否则不自适应)-(CGFloat)setIntroductionText:(NSString*)text label:(UILabel *)label{    /*boundingRectWithSize: CGSize 对应 constrainedToSize: CGSize     attributes:@{NSFontAttributeName: [ UIFont ] } 对应 sizeWithFont[ UIFont ]     options: NSStringDrawingUsesLineFragmentOrigin 默认照填     context: nil 默认照填 */        CGRect frame = label.frame;    label.numberOfLines = 0;    label.font = [UIFont systemFontOfSize:17.0];        CGSize sizeText =[text boundingRectWithSize:CGSizeMake(KanalysisTitleWhight, 1000) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:17.0]} context:nil].size;        frame.size.height = sizeText.height;        label.frame = frame;        // 返回高度    return sizeText.height;}

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