UIView默认属性和自定义属性

Question

我使用默认属性创建了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添加一些子视图

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")
        }
    }
}

然后我得到了默认的UIView，它是Superview和Superview之上的子视图：

如何删除具有默认UIView属性的视图并使用自定义属性重绘？

Answer 1

我无法完全理解您的问题。我了解的是您想获得特定的视图，例如三角形视图。

一种实现此目的的方法是，将tag分配给如下所示的每个子视图，如下所示：

aView.tag = 6

，然后当您想要获得子视图时，可以使用下面的viewWithTag函数

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

获取自定义视图的另一种方法是循环思想子视图，然后尝试将视图投射到如下所示的自定义类中

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