编辑 NSTextField 时检测箭头/输入键答案

【问题标题】：Detecting arrow/enter keys when editing NSTextField编辑 NSTextField 时检测箭头/输入键
【发布时间】：2017-12-06 21:05:56
【问题描述】：

我找不到解决此问题的最新内容。如何在编辑 NSTextField 时监控诸如箭头键之类的操作？

根据我的查找： - NSControlTextEditingDelegate 函数未被调用（而且我不知道如何使用它们） - NSTextFieldDelegate 函数没有列出可以在这里工作的东西

【问题讨论】：

Recognize if user has pressed arrow key while editing NSTextField swift的可能重复

标签： cocoa nstextfield

【解决方案1】：

设置您的文本字段的委托：

textField.delegate = self

为协议添加以下继承：

class MyTextField : NSTextFieldDelegate, NSControlTextEditingDelegate { ...

并实现以下内容：

   func control(_ control: NSControl, textView: NSTextView, doCommandBy commandSelector: Selector) -> Bool {
    if commandSelector == #selector(moveUp(_:)) {
        ...
    } else if commandSelector == #selector(moveDown(_:)) {
        ...
    } else if commandSelector == #selector(insertNewline(_:)) {
        ...
    }
    return true
}

这个链接Recognize if user has pressed arrow key while editing NSTextField swift有更深入的解释

【讨论】：

【解决方案2】：

keyDown doesn't seem to work with NSTextFields (it does for NSTextView)，所以我所做的是子类NSTextField 或ViewController 并添加这些方法：

import Cocoa

class MyTextField: NSTextField
{    
    override func keyUp(with event: NSEvent) {
        print("MyTextField keyUp key is %ld", event.keyCode)

        super.keyUp(with: event)            
    }
}

class MyTextView: NSTextView
{
    override func keyDown(with event: NSEvent) {

        print("MyTextView keyDown key is %ld", event.keyCode)

        super.keyDown(with: event)
    }    
}

class ViewController: NSViewController {

    override func keyUp(with event: NSEvent) {
        print("ViewController keyUp key is %ld", event.keyCode)

        super.keyUp(with: event)
    }
}

【讨论】：