按钮下自带划线 && 计算Label.text长度

按钮下自带划线

UIButton *button = 

[ UIButton buttonWithType :UIButtonTypeCustom ];

button.frame = frame;

NSMutableAttributedString *content = [[NSMutableAttributedStrin alloc]initWithString:text];

NSRange contentRange = {0,[content length]};

[content addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:contentRange];

button.titleLabel.attributedText=content;

计算宽度

UIFont * font = [UIFont systemFontOfSize:13];

    CGSize lastSize = [str sizeWithAttributes:[NSDictionary dictionaryWithObjectsAndKeys:font,NSFontAttributeName,nil]];

CGFloat w = lastSize.width;