以编程方式更改视图的高度和宽度会导致使用swift在iOS中出现意外行为

Question

I was making a view rounded by using

dashboardView.layer.cornerRadius = dashboardView.frame.height/2

And it was working. Then I changed the height and width of my View with this method

dashboardView.frame = CGRect(x: screenSize.width/2,y: 300,width: 200,height: 200)

Now when I try to make it round by using same method, it's not working. I was also adding a gradient layer on the view with this method

    let gradient: CAGradientLayer = CAGradientLayer()
    let endingColorOFGradient = UIColor(colorLiteralRed: 133/255, green: 210/255, blue: 230/255, alpha: 1.0).CGColor
    let startingColorOfGradient = UIColor(colorLiteralRed: 50/255, green: 189/255, blue: 170/255, alpha: 1.0).CGColor
    gradient.startPoint = CGPoint(x: 1.0, y: 0.5)
    gradient.endPoint = CGPoint(x: 0.0, y: 0.5)
    gradient.frame = CGRect(x: 0, y: 0, width: dashboardView.layer.frame.width, height: dashboardView.layer.frame.height)
    gradient.colors = [startingColorOfGradient , endingColorOFGradient]
    self.dashboardView.layer.insertSublayer(gradient, atIndex:0)
    // making gradient round
    gradient.cornerRadius = dashboardView.frame.height/2

And after changing the size of View gradient, the layer does become round but my View does not.

This is the View I created. Actually I want to change its size according to device. It should be small on iphone 5 and larger on iphone 6+

This is what I am getting I am stuck at this point.

Answer 1

call dashboardView.layer.cornerRadius = dashboardView.frame.height/2 again after setting gradient because you are changing frame so it's height should be different so your dashboardView.frame.height/2 have different value.

and try to set clipstobounds to true for dashboardView if required.

Answer 2

The problem was Autolayout constraints.

I was trying to change the size of view but Autolayout was putting it back. So I created outlet of my Height and Width constraint and changed it accordingly.