UIBezierPath doesn't work in TopRight corner and BottomRight corner

问题

I want to round my right corners, but only works for Left corners

let path = UIBezierPath(roundedRect: view.bounds, byRoundingCorners: [UIRectCorner.TopLeft, UIRectCorner.TopRight], cornerRadii: CGSizeMake(20.0, 20.0))
let maskLayer = CAShapeLayer()
    maskLayer.path = path.CGPath
    view.layer.mask = maskLayer
    view.layer.masksToBounds = true

回答1:

The problem is that you're getting the view's bounds before it's been resized for the current device. It's larger than it will be later when it appears on screen, so the right side of your rounded rect is off the right side of the screen.

You need to create path and set maskLayer.path later, after the view has been resized, which means during or after the layout phase of the run loop. So either subclass the view and do it in the view's layoutSubviews method, or do it in the view controller's viewDidLayoutSubviews method.

回答2:

Swift 3

It works for me !

override func layoutSubviews() {
    super.layoutSubviews()
    DispatchQueue.main.async {
       self.containerView.roundCorners(corners: [.topRight,.topLeft], radius: 25)
       self.containerView.layer.masksToBounds = true
    }
    self.layoutIfNeeded()
}

You can check the method "roundCorners" here : https://stackoverflow.com/a/41217863/3687902

回答3:

If you are tried to set the RoundingCorners for View which are design on Storyboard OR Xib then please set the corner and MaskLayer.path into below method.

override func viewDidLayoutSubviews() {
// here you can write the code...
    }

来源：https://stackoverflow.com/questions/35685726/uibezierpath-doesnt-work-in-topright-corner-and-bottomright-corner

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swift

uibezierpath