Swift 带有初始参数的自定义 UIView

Question

我写了一个自定义的 UIView class，它接受几个参数并覆盖一个空的故事板 UIView（subclassed 作为 MultiPositionTarget class 而不是 UIview）作为 below.The 下面的视图链接为视图控制器的出口，如下面的代码所示（总共 9 个视图）。

// Initialize the targets
target1 = MultiPositionTarget(.zero,"targetTemp.png","David","Target")
target1.parentVC = self
targetList.append(target1)

但是，它不接受参数。并且只加载视图。下面是我的 class：

class MultiPositionTarget: UIView{

    var targetName: String!
    var bottomLabelName: String!
    var imageName: String!
    var isSelected: Bool!
    var labelTop: UILabel!
    var labelBottom: UILabel!
    var parentVC: SelectTargetViewController!

    init(_ frame: CGRect,_ imagName: String,_ targetname: String,_ targetlabel: String){

        self.imageName = imagName
        self.targetName = targetname
        self.bottomLabelName = targetlabel
        super.init(frame: frame)
        setUp()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setUp()
    }

    func setUp(){

        let viewWidth = self.bounds.width
        let viewHeight = self.bounds.height
        // Add top label
        labelTop = UILabel(frame: CGRect(x: 0, y: 0, width: viewWidth, height: viewHeight/5))

        //labelTop.center = CGPoint(x: 160, y: 285)
        labelTop.textAlignment = .center
        labelTop.font = UIFont(name:"System",size:6)
        labelTop.text = self.imageName
        labelTop.textColor = UIColor.white
        labelTop.backgroundColor = hexStringToUIColor(hex: "#770B2C")
        //labelTop.alpha = 0.5
        self.addSubview(labelTop)

        let image = UIImage(named: "targetTemp.png")
        let imageView = UIImageView(image: image!)
        imageView.frame = CGRect(x: 0, y: (viewHeight-viewHeight * 4/5), width: viewWidth, height: (viewHeight * 4/5))
        self.addSubview(imageView)

        // Add bottom Label
        labelBottom = UILabel(frame: CGRect(x: 0, y: (viewHeight * 4/5), width: viewWidth, height: viewHeight/5))

        //labelBottom.center = CGPoint(x: 160, y: 285)

        labelBottom.textAlignment = .center
        labelBottom.text = self.bottomLabelName
        labelBottom.font = UIFont(name:"System",size:10)
        labelBottom.textColor = UIColor.white
        labelBottom.backgroundColor = hexStringToUIColor(hex: "770B2C")
        labelBottom.alpha = 0.95
        self.addSubview(labelBottom)

        self.isUserInteractionEnabled = true
        let viewTap = UITapGestureRecognizer(target: self, action: #selector(singleTap))
        self.addGestureRecognizer(viewTap)

    }

}

感谢任何帮助或提示。在此先感谢堆栈溢出系列。

Answer 1

此行正在创建新视图：

target1 = MultiPositionTarget(.zero,"targetTemp.png","David","Target")

新视图与屏幕上显示的视图无关。新视图实际上根本不在屏幕上，因为您还没有将它添加到视图层次结构中。即使你这样做了，它也是不可见的，因为它的帧数为零。

简而言之，您不能调用您的自定义初始化器并且在故事板中设计您的视图。您也可以在故事板或代码中初始化所需的属性。

如果你也想初始化故事板中的属性，你可以将imageName、bottomLabelName和targetName修改为@IBInsepctable:

@IBInsepctable var targetName: String!
@IBInsepctable var bottomLabelName: String!
@IBInsepctable var imageName: String!
// or, if you want to directly select an image from the storyboard:
// @IBInsepctable var image: UIImage!

这样，这些属性将显示在故事板的属性检查器中。

如果你想在代码中初始化它，你必须用赋值语句设置它，而不是用初始化器:

target1.targetName = "David"
target1.bottomLabelName = "Target"
target1.imageName = "targetTemp.png"
target1.parentVC = self
targetList.append(target1)

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