UIView默認屬性和自定義屬性

Question

我使用默認屬性創建了UIView

var color =  Label.Color.black { didSet{ setNeedsDisplay() }}
var count =  Label.Count.one.rawValue   { didSet{ setNeedsDisplay() }}
var shading =  Label.Shading.empty   { didSet{ setNeedsDisplay() }}
var shape =  Label.Shape.triangle { didSet{ setNeedsDisplay() }}
var isSelected = false

然后我在ViewController中使用相同的UIView添加一些子視圖

func addCardsOnGridView() {
    grid.frame = cardsView.bounds
    grid.cellCount = game.cardsOnDeck.count
    for cardView in cardsView.subviews{

        cardView.removeFromSuperview()
    }
    for index in 0..<grid.cellCount {
        if let cellFrame = grid[index] {
            let card = game.cardsOnDeck[index]
            let cardView = CardsView(frame: cellFrame.insetBy(dx: CardSize.inset, dy: CardSize.inset))
            cardView.color = card.label.color
            cardView.count = card.label.count.rawValue
            cardView.shape = card.label.shape
            cardView.shading = card.label.shading
            //cardView.isSelected = card.isSelected
            //print(cardsView.isSelected)
            cardsView.addSubview(cardView)

        } else {
            print("grid[\(index)] doecnt exist")
        }
    }
}

然后我得到了默認的UIView作為Superview和Superview之上的子視圖：

如何刪除具有默認UIView屬性的視圖並使用自定義屬性重繪？

Answer 1

我無法完全理解您的問題。 我了解的是您想獲得特定的視圖，例如三角形視圖。

實現此目的的一種方法是在mainView中添加tag ，將tag分配給每個子視圖，如下所示

aView.tag = 6

然后當您想要獲得子視圖時，可以使用如下的viewWithTag函數

if let aCustomView = mainView.viewWithTag(6) as? CustomView {
   aCustomView.myColor = .blue
}

獲取自定義視圖的另一種方法是循環思想子視圖，然后嘗試將視圖轉換為自定義類，如下所示

mainView.subviews.forEach({ (aView) in
  if aView.tag == 6,
     let customView = aView as? CustomView {
        customView.myColor = .blue
  }
})