UIView does not change colors after setting backgroundColor programmatically-CodePudding

I'm creating a subview to add onto an existing view. I'm trying to assign the background color to this subview to red programmatically but displays as the defaulted color still.

let toggleView = UIView(frame: CGRect(x: 0, y: 0, width: screenWidth, height: screenHeight))
        
toggleView.backgroundColor = UIColor.red

CodePudding user response：

As from the above code snippet it looks like that you are creating a view but not adding it as a subview to the parent view. It will be best if you can provide full function so that we can look into the actual cause.

CodePudding user response：

You have created the toggleView with a red background but you have not added it to the main view, this is what you should do:

let screenWidth = view.frame.size.width
let screenHeight = view.frame.size.height
    
let toggleView = UIView(frame: CGRect(x: 0, y: 0, width: screenWidth, height: screenHeight))
toggleView.backgroundColor = UIColor.red
view.addSubview(toggleView)