准确计算UIlabel的宽高

• 准确计算UIlabel的宽高

height = [self.label.text sizeThatFits:CGSizeMake(SCREEN_WIDTH - 30, MAXFLOAT) ].height;

• 设置UIlabel的行间距和部分颜色

NSMutableAttributedString* text =[[NSMutableAttributedString alloc]initWithString:string];

NSMutableParagraphStyle * paragraphStyle =[[NSMutableParagraphStyle alloc]init];

//设置行距

[paragraphStyle setLineSpacing:15.0f];

[text addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, string.length)];

//设置一定Range区间文字颜色

[text addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(0, 30)];

//设置一定Range区间文字下划线

[text addAttribute:NSUnderlineStyleAttributeName value:@(NSUnderlineStyleSingle) range:NSMakeRange(0, 30)];

label.attributedText = text;

[self.view addSubview:label];

[label sizeToFit];