SwiftUI Representable TextField 在消失时更改字体

SwiftUI Representable TextField changes Font on disappear

我在 SwiftUI for MacOS 中使用 Representable ViewController 作为自定义 NSTextField。我正在为该 TextField 应用自定义的增大字体大小。效果很好,我在上一个问题 .

中有一个关于该主题的问题

我现在正在 viewDidAppear() 方法中设置 TextField 的字体,效果很好。我可以看到更大的字体。现在的问题是,当我的视图没有聚焦时,文本大小正在缩小到正常水平。当我返回并再次激活 window 时,我看到了小字体。当我再次输入时,它会刷新并且我会看到正确的字体大小。

这是我正在使用的代码:

class AddTextFieldController: NSViewController {
    @Binding var text: String
    let textField = NSTextField()
    var isFirstResponder : Bool = true

    init(text: Binding<String>, isFirstResponder : Bool = true) {
        self._text = text
        textField.font = NSFont.userFont(ofSize: 16.5)
        super.init(nibName: nil, bundle: nil)
        NSLog("init")
    }

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

    override func loadView() {
        textField.delegate = self
        //textField.font = NSFont.userFont(ofSize: 16.5)
        self.view = textField
    }

    override func viewDidAppear() {
        self.view.window?.makeFirstResponder(self.view)
        textField.font = NSFont.userFont(ofSize: 16.5)
    }
}

extension AddTextFieldController: NSTextFieldDelegate {

  func controlTextDidChange(_ obj: Notification) {
    if let textField = obj.object as? NSTextField {
      self.text = textField.stringValue
    }
    textField.font = NSFont.userFont(ofSize: 16.5)

  }
}

这是代表:

struct AddTextFieldRepresentable: NSViewControllerRepresentable {

  @Binding var text: String

  func makeNSViewController(
    context: NSViewControllerRepresentableContext<AddTextFieldRepresentable>
  ) -> AddTextFieldController {
    return AddTextFieldController(text: $text)
  }

  func updateNSViewController(
    _ nsViewController: AddTextFieldController,
    context: NSViewControllerRepresentableContext<AddTextFieldRepresentable>
  ) {
    }
}

这是一个演示:

我考虑过在视图返回时使用 Notification,但不确定

NotificationCenter.default.addObserver(self, selector: #selector(willEnterForeground), name: NSApplication.willBecomeActiveNotification, object: nil)

这是一个解决方案。使用 Xcode 11.4 / macOS 10.15.4

测试
class AddTextFieldController: NSViewController {
    @Binding var text: String
    let textField = MyTextField()  // << overridden field

和单元格和控件所需的自定义 类(两者!!)(在所有其他地方,只需删除不再需要的用户字体使用):

class MyTextFieldCell: NSTextFieldCell {
    override var font: NSFont? {
        get {
            return super.font
        }
        set {
            // system tries to reset font to default several
            // times (here!), so don't allow that
            super.font = NSFont.userFont(ofSize: 16.5)
        }
    }
}

class MyTextField: NSTextField {
    override class var cellClass: AnyClass? {
        get { MyTextFieldCell.self }
        set {}
    }

    override var font: NSFont? {
        get {
            return super.font
        }
        set {
            // system tries to reset font to default several
            // times (and here!!), so don't allow that
            super.font = NSFont.userFont(ofSize: 16.5)
        }
    }
}