//先定义一个UIView
UIView * view = [[UIView alloc] initWithFrame:CGRectMake(50, 50, 50, 50)];
//圆的半径是view宽的一半
view.layer.cornerRadius = view.frame.size.width / 2;
//是否进行剪切
view.clipsToBounds = YES;
// 给view一个颜色
view.backgroundColor = [UIColor redColor];
//添加到视图上
[self.View addSubview:view];
//UIButton
UIButton * = [UIButton buttonWithType:(UIButtonTypeRoundedRect)];
button.frame =CGRectMake(10, 10, 50, 50);
button.layer.cornerRadius = button.frame.size.width /2;
button.clipsToBounds = YES;
[self.view addSubview:button];
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