UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(15, 100, self.view.bounds.size.width - 30, 200)];

label.font = [UIFont systemFontOfSize:15];

NSString *leftString =@"活动地址：";

NSMutableAttributedString *aString = [[NSMutableAttributedString alloc]initWithString:[NSString stringWithFormat:@"%@%@",leftString,@"金融街第九大道第七大院第五小区第三栋B座1021室第九大道第七大院第五小区第三栋B座1021室第九大道第七大院第五小区第三栋B座1021室"]];

[aString addAttribute:NSForegroundColorAttributeName value:[UIColor blackColor] range:NSMakeRange(0,leftString.length)];

[aString addAttribute:NSForegroundColorAttributeName value:kUIColorFromRGBWithAlapha(69, 69, 69, 1) range:NSMakeRange(5, aString.length-leftString.length)];

[aString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:11] range:NSMakeRange(0, aString.length-leftString.length)];

///  行间距  === 8

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

[paragraphStyle setLineSpacing:8];

[aString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [aString length])];

label.attributedText= aString;

[self.view addSubview:label];

效果图