保留 UIButton 的圆边

Question

trying to preserve the 'roundness' of a UIButton while user rotates the device:

func resizeButtons() {


        startButton.layer.masksToBounds = true
        startButton.layer.cornerRadius = self.startButton.frame.size.width / 2
        startButton.layer.borderColor = UIColor.blackColor().CGColor
        startButton.layer.borderWidth = 1.0

    }

override func didRotateFromInterfaceOrientation(fromInterfaceOrientation: UIInterfaceOrientation) {


        switch UIDevice.currentDevice().orientation{
        case .Portrait:
             self.resizeButtons()
        case .PortraitUpsideDown:
           self.resizeButtons()
        case .LandscapeLeft:
             self.resizeButtons()
        case .LandscapeRight:
             self.resizeButtons()
        default:
            print("default")
        }

    }

I am using auto layout and StoryBoards (button aspect ratio 1:1, and aspect ratio button to container view 1:3, button center horizontally and vertically to container).

The result is a bit cumbersome and 'ugly' as the device rotates the UIButton becomes a rounded corner rectangle and then full circle.

Answer 1

Have you tried just setting the cornerRadius to a static variable? Your frame width changes every time you rotate, causing it to become either a circle or a rounded rectangle. My preferred cornerRadius value is 5, eg button.layer.cornerRadius = 5

I also wouldn't call the resize every time the orientation changes. Just set the variables in viewDidLoad() and call it a day

EDIT: For a circle:

That is the UIButton. It is centered in the view, but that shouldn't matter.