iOS自定义一个Label上显示不同大小不同颜色

UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(100,100,200,30)];

NSString *balance =@"6666";

NSMutableAttributedString *aString = [[NSMutableAttributedString alloc]initWithString:[NSString stringWithFormat:@"价格: %@元",balance]];

[aString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor]range:NSMakeRange(6, balance.length)];

[aString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:15]range:NSMakeRange(6, balance.length)];

label.attributedText= aString;

[self.view addSubview:label];