如何在UILabel第一个元素前加图片

注意：未经本人同意，请勿转发

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0    , 100, 200, 44)];

[self.view addSubview:label];

NSMutableAttributedString *goalTipStr = [[NSMutableAttributedString alloc]initWithString:@"123456"];
NSTextAttachment *alertImg = [[NSTextAttachment alloc]init];
alertImg.image = [UIImage imageNamed:@"!_gray"];
alertImg.bounds=CGRectMake(0, -2, 13, 13);
NSAttributedString *imgStr = [NSAttributedString attributedStringWithAttachment:alertImg];
[goalTipStr insertAttributedString:imgStr atIndex:0];

label.text = goalTipStr ;

效果图。。。。。