视图切圆角.. 每一个角

   UIBezierPath * bezierPath = [UIBezierPath bezierPathWithRoundedRect:skinSource.bounds byRoundingCorners:UIRectCornerBottomRight | UIRectCornerTopRight cornerRadii:CGSizeMake(14, 14)];
    CAShapeLayer *maskLayer = [CAShapeLayer layer];
    maskLayer.frame = skinSource.bounds;
    maskLayer.path = bezierPath.CGPath;

    skinSource.layer.mask = maskLayer;

 

typedef NS_OPTIONS(NSUInteger, UIRectCorner) {
    UIRectCornerTopLeft     = 1 << 0,
    UIRectCornerTopRight    = 1 << 1,
    UIRectCornerBottomLeft  = 1 << 2,
    UIRectCornerBottomRight = 1 << 3,
    UIRectCornerAllCorners  = ~0UL

};