裁剪矩形指定圆角

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某UI中经常会有裁剪某两个矩形圆角的需求, 本文提供两个简单的裁剪矩形指定圆角的方法.

OC写法

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/**
 裁剪某几个圆角

 @param view 被裁减的view
 @param corners 裁剪的角
 @param cornerRadii 裁剪半径
 */
- (void)clipCornerOf:(UIView *)view byRoundingCorners:(UIRectCorner)corners cornerRadii:(CGSize)radii{
    UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect: view.bounds byRoundingCorners: corners cornerRadii: radii];
    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
    maskLayer.frame = self.bgView.bounds;
    maskLayer.path = maskPath.CGPath;
    view.layer.mask = maskLayer;
}

Swift写法

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/**
 裁剪某几个圆角

 @param view 被裁减的view
 @param corners 裁剪的角
 @par
  func clipCorner(of view: UIView, corners: UIRectCorner, radii:CGSize) -> Void {
  	let path =  UIBezierPath(roundedRect: view.bounds, byRoundingCorners: corners, cornerRadii: radii)
    let shapeLayer = CAShapeLayer()
    shapeLayer.frame = view.bounds
    shapeLayer.path = path.cgPath
    view.layer.mask = shapeLayer
}

Swift分类写法(OC分类可以自行编写)

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extension UIView{
    func clip(corners: UIRectCorner, radii:CGSize) -> Void {
        let path =  UIBezierPath(roundedRect: bounds, byRoundingCorners: corners, cornerRadii: radii)
        let shapeLayer = CAShapeLayer()
        shapeLayer.frame = bounds
        shapeLayer.path = path.cgPath
        layer.mask = shapeLayer
    }
}