Question

我有一个自定义NSControl，我正在尝试使函数edit(withFrame:editor:delegate:event:)正常工作。调用它后，我希望字段编辑器出现在我的视图中，但是什么也没发生。

我已经阅读了有关该功能的文档，并创建了一个最小的示例：

class MyView: NSControl, NSControlTextEditingDelegate, NSTextDelegate {
  required init?(coder: NSCoder) {
    super.init(coder: coder)
    isEnabled = true
  }

  override func mouseDown(with event: NSEvent) {
    let editor = window!.fieldEditor(true, for: nil)!
    let rect = bounds.insetBy(dx: 10.0, dy: 10.0)
    self.edit(withFrame: rect, editor: editor, delegate: self, event: event)
  }

  func control(_ control: NSControl, textShouldBeginEditing fieldEditor: NSText) -> Bool {
    return true
  }

  func control(_ control: NSControl, textShouldEndEditing fieldEditor: NSText) -> Bool {
    self.endEditing(fieldEditor)
    return true
  }

  func textShouldBeginEditing(_ textObject: NSText) -> Bool {
    return true
  }
}

从示例中可以看到，我不太确定是遵守NSControlTextEditingDelegate还是NSTextDelegate。我实现的功能似乎都没有被调用。

还是我可能误解了该功能的目的？我应该覆盖它而不是调用它吗？

Answer 1

我不是字段编辑器的专家，但是浏览Apple的文档似乎表明，该文件旨在在控件NSCell类上实现并自行呈现文本。如果希望字段编辑器出现在以上示例中，则必须将字段编辑器插入视图层次结构。它不会自动发生。

class CustomTextControl: NSControl {
    override func mouseDown(with event: NSEvent) {
        // Make sure
        if currentEditor() == nil {
            if let controlWindow = window {
                if controlWindow.makeFirstResponder(controlWindow) {
                    // It is safe to claim the field editor
                    if let editor = controlWindow.fieldEditor(true, for: nil) as? NSTextView {
                        addSubview(editor)
                        editor.frame = bounds
                        edit(withFrame: bounds, editor: editor, delegate: nil, event: event)
                    }
                } else {
                    // Some other control has first responder, force first responder to resign
                    controlWindow.endEditing(for: nil)
                }
            }
        }
    }
}

我建议您阅读有关Cocoa Text Architecture Guide的Apple文档。特别是Working with the Field Editor和NSCell文档。这是一项艰巨的任务。

你想达到什么目的？

如何使用NSControl的edit（withFrame：editor：delegate：event：）？

1 个答案: