设置圆角

1.layer层设置

self.myButton = [[UIButton alloc] initWithFrame:self.bounds];
self.myButton.layer.cornerRadius = (self.myButton.frame.size.width - 1) / 2;//圆形
self.myButton.clipsToBounds = true;
(self.myButton.layer.masksToBounds = YES;)
//设置边框及其颜色
self.myButton.layer.borderWidth = 1.0;
self.myButton.layer.borderColor = [[UIColor whiteColor] CGColor];self.myButton = [[UIButton