（iOS开发）UIButton 半边圆角

//1、创建好myButton的各项

//2、添加以下代码，实现半边圆角（下边的半边圆角）

//3、想改变半边圆角，可以通过改变UIRectCornerBottomLeft | UIRectCornerBottomRight 

 UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:myButton.bounds      byRoundingCorners:UIRectCornerBottomLeft | UIRectCornerBottomRight    cornerRadii:CGSizeMake(10, 10)];

    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];

    maskLayer.frame = myButton.bounds;

    maskLayer.path = maskPath.CGPath;

    myButton.layer.mask = maskLayer;


// 全部圆角 
myButton.layer.cornerRadius=2;