swift UIView 子类，带有来自传递值的可选子视图答案

【问题标题】：swift UIView subclass with optional SubViews from passed valueswift UIView 子类，带有来自传递值的可选子视图
【发布时间】：2016-07-10 00:09:53
【问题描述】：

我有一个 UIView 子类，它有一个 UILabel 标题、一个按钮和另一个子视图，当视图在另一个视图控制器中使用时，它将根据传递的值发生变化。

class CustomView: UIView {

    enum PickerType {
        case pikerView
        case datePicker
    }

    private var dialogView:   UIView!
    private var titleLabel:   UILabel!
    private var pickerView:   UIPickerView!
    private var datePicker:   UIDatePicker!

    private var pickerType: PickerType!

    init() {
    super.init(frame: CGRectMake(0, 0, UIScreen.mainScreen().bounds.size.width, UIScreen.mainScreen().bounds.size.height))
    setupView()
}

required init(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

func setupView() {
    self.dialogView = createContainerView()

    self.dialogView.layer.shouldRasterize = true
    self.dialogView.layer.rasterizationScale = UIScreen.mainScreen().scale

    self.layer.shouldRasterize = true
    self.layer.rasterizationScale = UIScreen.mainScreen().scale

    self.dialogView.layer.opacity = 0.5
    self.dialogView.layer.transform = CATransform3DMakeScale(1.3, 1.3, 1)

    self.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0)

    self.addSubview(self.dialogView)
}

private func createContainerView() -> UIView {
    let screenSize = getScreenSize()
    let dialogSize = CGSizeMake(screenSize.width, 300)

    // For the black background
    self.frame = CGRectMake(0, 0, screenSize.width, screenSize.height)

    let dialogContainer = UIView(frame: CGRectMake(0, screenSize.height - dialogSize.height, dialogSize.width, dialogSize.height))

    //Title
    self.titleLabel = UILabel(frame: CGRectMake(10, 10, dialogSize.width - 20, 30))
    self.titleLabel.textAlignment = NSTextAlignment.Center
    self.titleLabel.font = UIFont.boldSystemFontOfSize(17)
    dialogContainer.addSubview(self.titleLabel)

    //Add the PickerView
    addPickerView(dialogContainer)

    return dialogContainer
}

/**Add the appropriate view based on pickerType*/
private func addPickerView(dialogContainer: UIView) {
    let screenSize = countScreenSize()
    let dialogSize = CGSizeMake(screenSize.width, 250)

    if pickerType == PickerType.pikerView {
        self.pickerView = UIPickerView(frame: CGRectMake(10, 30, 0, 0))
        self.pickerView.autoresizingMask = UIViewAutoresizing.FlexibleRightMargin
        self.pickerView.frame.size.width = dialogSize.width - 20
        dialogContainer.addSubview(self.pickerView)
    } else if pickerType == PickerType.datePicker {
        self.datePicker = UIDatePicker(frame: CGRectMake(10, 30, 0, 0))
        self.datePicker.autoresizingMask = UIViewAutoresizing.FlexibleRightMargin
        self.datePicker.frame.size.width = dialogSize.width - 20
        dialogContainer.addSubview(self.datePicker)
    }
}

func showPickerView(title: String) {
    self.pickerType = PickerType.pikerView
    self.titleLabel.text = title
}

func showDatePicker(title: String) {
    self.pickerType = PickerType.datePicker
    self.titleLabel.text = title
}
}

这个想法是，如果 CustomView().showPickerView 被调用，那么 pickerType 变量将被分配适当的值并加载 UIPickerView。如果调用 CustomView().showDatePicker，则加载 UIDatePicker。

我的问题是，addPickerView 是在调用 showPickerView() 或 showDatePicker() 之前调用的。

如何在视图初始化之前传递pickerType的值？

【问题讨论】：

标签： ios swift uiview ios9 init

【解决方案1】：

我已经通过将初始化程序更改为：

init(picker: PickerType) {
    super.init(frame: CGRectMake(0, 0, UIScreen.mainScreen().bounds.size.width, UIScreen.mainScreen().bounds.size.height))

    self.pickerType = picker
    setupView()
}

并在 CustomView 之外取出 PickerType 枚举。

现在我可以将自定义视图用作：

CustomView(picker: PickerType.datePicker).showDatePicker("Select date")
CustomView(picker: PickerType.pickerView).showPickerView("Select data")

但如果有更有效的方法来实现这一点，我很乐意提出建议。

【讨论】：