swift 4。自定义 View 未在自定义初始化中显示

Question

谁能指出以下代码有什么问题吗？

 class CustomView: UIView {
        init(_ i:Int, _ view:UIView){

            super.init(frame: CGRect.init(x: 0, y: i*300, width:Int(view.frame.size.width) , height: 300))
            for i in stride(from: 0, to: 3, by: 1){
                var view = UIView.init(frame: CGRect.init(x: (Int(self.frame.size.width/2-50)), y: i*00, width: 100, height: 100))

                switch(i%3){
                case 0:
                    view.backgroundColor = UIColor.red
                    break;
                case 1:
                    view.backgroundColor = UIColor.green
                    break;
                case 2:
                    view.backgroundColor = UIColor.orange
                    break;
                default:
                    break;

                }

                self.addSubview(view)


            }

 }

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    print("not required to implement requiredInit here")


}

我试图根据模运算符显示 3 种不同颜色的 View 。但由于某种原因，仅显示最后一个橙色的。前两个没有出现。代码也不会崩溃。我是否需要将自定义逻辑移至所需的 init 中。

谢谢。

Answer 1

请检查如下:

init(_ i:Int, _ view:UIView){
    super.init(frame: CGRect.init(x: 0, y: i*300, width:Int(view.frame.size.width) , height: 300))
    for i in stride(from: 0, to: 3, by: 1){
        var subview = UIView.init(frame: CGRect.init(x: (Int(self.frame.size.width/2-50)), y: i*100, width: 100, height: 100))

        switch(i%3){
        case 0:
            subview.backgroundColor = UIColor.red
            break;
        case 1:
            subview.backgroundColor = UIColor.green
            break;
        case 2:
            subview.backgroundColor = UIColor.orange
            break;
        default:
            break;
        }
        view.addSubview(subview)
    }
}