UILabel * labb ＝ 。。。
//set the border of labb
labb.layer.borderWidth = 1;
labb.layer.borderColor = [UIColor lightGrayColor].CGColor;
//创建圆角图片
fixLab.layer.masksToBounds = YES;
fixLab.layer.cornerRadius = fixLab.frame.size.height*0.1;
[self.view addSubview:labb];
原文：http://www.cnblogs.com/isItOk/p/4615408.html