IOS label 设置行高

　　self.adTittle.text = @"转化付费转化转化付费转化转化付费转化转化付费转化转化付费转化转化付费转化转化付费转化转化付费转化转化付费转化转化付费转化转化付费转化转化付费转化转化付费转化转化付费转化";
 
    
    NSMutableParagraphStyle  *paragraphStyle = [[NSMutableParagraphStyle alloc] init];

    // 行间距设置为8
    [paragraphStyle  setLineSpacing:8];

    NSString  *testString = self.adTittle.text;
    NSMutableAttributedString  *setString = [[NSMutableAttributedString alloc] initWithString:testString];
    [setString  addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [testString length])];
    
    // 设置Label要显示的text
    [self.adTittle  setAttributedText:setString];

paragraphStyle.lineBreakMode = NSLineBreakByTruncatingTail;