为什么自定义 UIRefreshControl 类的背景颜色在 Swift 中没有改变？

Question

I created custom UIRefreshControl as below:

class CustRefreshCont: UIRefreshControl {

    override func draw(_ rect: CGRect) {
        // Drawing code
        let blueColor: UIColor = UIColor.blue
        let lightGrayColor: UIColor = UIColor.lightGray

        self.tintColor = blueColor
        self.backgroundColor = lightGrayColor

        self.attributedTitle = NSAttributedString(string: "Updating data", attributes: [NSAttributedStringKey.foregroundColor : self.tintColor, NSAttributedStringKey.backgroundColor : self.backgroundColor!])
    }
}

And way I assign UIRefreshControl from UIViewController is copied below:

    let refreshControl = CustRefreshCont()

Text and the ActivityIndicator customizations are being displayed, however the background color is showing as black.

Any ideas what is wrong with my code?

Answer 1

Move your configuration code to the initializer. I don't think the draw method is the correct place to do it.

override init() {
    super.init()
    backgroundColor = .red
    tintColor = .blue
}