Unable to change background color of UIView from black

Question

This is my first time when I ran into problems with drawRect. I have a simple subclass of UIView with a path to fill. All perfectly. The path fills correctly, but the background remains black, no matter what. What should I do? My code is below:

var color: UIColor = UIColor.red {didSet{setNeedsDisplay()}}

private var spaceshipBezierPath: UIBezierPath{
    let path = UIBezierPath()
    let roomFromTop: CGFloat = 10
    let roomFromCenter: CGFloat = 7
    path.move(to: CGPoint(x: bounds.minX, y: bounds.maxY))
    path.addLine(to: CGPoint(x: bounds.minX, y: bounds.minY+roomFromTop))
    path.addLine(to: CGPoint(x: bounds.midX-roomFromCenter, y: bounds.minY+roomFromTop))
    path.addLine(to: CGPoint(x: bounds.midX-roomFromCenter, y: bounds.minY))
    path.addLine(to: CGPoint(x: bounds.midX+roomFromCenter, y: bounds.minY))
    path.addLine(to: CGPoint(x: bounds.midX+roomFromCenter, y: bounds.minY+roomFromTop))
    path.addLine(to: CGPoint(x: bounds.maxX, y: bounds.minY+roomFromTop))
    path.addLine(to: CGPoint(x: bounds.maxX, y: bounds.maxY))
    path.addLine(to: CGPoint(x: bounds.minX, y: bounds.maxY))
    return path
}

override func draw(_ rect: CGRect) {
    color.setFill()
    spaceshipBezierPath.fill()
}

Here is the view:

Answer 1

I have a simple subclass of UIView ... but the background remains black no matter what

Typically, the point is that you forgot to set the UIView subclass isOpaqueto false. It is a good idea to do this in the initializer of the UIView subclass so that it is early enough.

, . , :

class MyView : UIView {
    private var spaceshipBezierPath: UIBezierPath{
        let path = UIBezierPath()
        // ... identical to your code
        return path
    }
    override func draw(_ rect: CGRect) {
        UIColor.red.setFill()
        spaceshipBezierPath.fill()
    }
}

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()        
        let v = MyView(frame:CGRect(x: 100, y: 100, width: 200, height: 200))
        self.view.addSubview(v)
    }
}

:

MyView:

override init(frame:CGRect) {
    super.init(frame:frame)
    self.isOpaque = false
}
required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

. , ?