How to change Corner Radius of NSView in Swift Language

cocoa, macos, nsview, swift

Solution

That is because `self.layer` is an optional value, which is currently not set. Add `self.wantsLayer = true` before `self.layer.cornerRadius`, to make sure a proper `layer` exists.

init(frame: NSRect) {
    super.init(frame: frame)
    self.wantsLayer = true
    self.layer.cornerRadius  = cornerRad
}

Problem

changing corner radius of NSView should be pretty straight forward however i am getting error message "fatal error: Can't unwrap Optional.None". is there a chance i am doing this with 10.9 not 10.10 and this is happening due framework differences? or the code is wrong. ``` class aRoundView: NSView { let cornerRad = 5.0 init(frame: NSRect) { super.init(frame: frame) self.layer.cornerRadius = cornerRad } override func drawRect(dirtyRect: NSRect) { super.drawRect(dirtyRect) NSColor.redColor().setFill() NSRectFill(dirtyRect) } } ``` EDIT calling it in ``` func applicationDidFinishLaunching(aNotification: NSNotification?) { let aView = mainViewTest(frame: NSMakeRect(0, 0, 100, 100)) self.window.contentView.addSubview(aView) } ``` actually it is not just that. any iteration with self.layer gives same result, backgroundcolor etc.

Original source