cocoa - 编辑 NSTextField 时检测箭头/输入键

Question

我找不到任何可以解决此问题的最新内容。如何在编辑 NSTextField 时监控箭头键按下等操作？

据我查找:- NSControlTextEditingDelegate 函数未被调用(我不知道如何使用它们)- NSTextFieldDelegate 函数未列出此处可用的内容

Answer 1

设置文本字段的委托(delegate):

textField.delegate = self

为协议(protocol)添加以下继承:

类 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
}

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