为什么 -[NSTextInputClient doCommandBySelector:] 不应该将事件传递给响应者链？
Why should -[NSTextInputClient doCommandBySelector:] not pass the event up the responder chain?
文本视图不应将不可调用的命令转发到响应链，the docs say for -[NSTextInputClient doCommandBySelector:]:
If aSelector cannot be invoked, then doCommandBySelector: should not pass this message up the responder chain. NSResponder also implements this method, and it does forward uninvokable commands up the responder chain, but a text view should not. A text view implementing the NSTextInputClient protocol inherits from NSView, which inherits from NSResponder, so your implementation of this method will override the one in NSResponder. It should not call super.
如果我对文本的理解没有让我失望，最后一句话没有澄清，只是重新说明了事情是如何设置的。
所以基本上只有一个药方："a text view should not"。期间.
但是为什么呢？
我可以理解这样一种情况，您希望文本视图不对 any/all NSResponder 方法作出反应，而是将这些委托给它的视图控制器，例如。这会不会惹麻烦？这只是在 macOS 应用程序中保持文本视图行为一致的建议吗？
来自The Key-Input Message Sequence：
If the first responder is a text view, the key event enters the text system. The key window sends the text view a keyDown: message with the event as its argument. The keyDown: method passes the event to handleEvent:, which sends the character input to the input context for key binding and interpretation. In response, the input context sends either insertText:replacementRange:, setMarkedText:selectedRange:replacementRange:, or doCommandBySelector: to the text view.
如果文本视图处理按键事件而滚动视图或其他视图收到 doCommandBySelector: 消息，则不正确。您不能将 doCommandBySelector: 发送给 super，但可以将选择器发送给委托人。
文本视图不应将不可调用的命令转发到响应链，the docs say for -[NSTextInputClient doCommandBySelector:]:
If
aSelectorcannot be invoked, thendoCommandBySelector:should not pass this message up the responder chain.NSResponderalso implements this method, and it does forward uninvokable commands up the responder chain, but a text view should not. A text view implementing theNSTextInputClientprotocol inherits fromNSView,which inherits fromNSResponder, so your implementation of this method will override the one inNSResponder. It should not call super.
如果我对文本的理解没有让我失望，最后一句话没有澄清，只是重新说明了事情是如何设置的。
所以基本上只有一个药方："a text view should not"。期间.
但是为什么呢？
我可以理解这样一种情况，您希望文本视图不对 any/all NSResponder 方法作出反应，而是将这些委托给它的视图控制器，例如。这会不会惹麻烦？这只是在 macOS 应用程序中保持文本视图行为一致的建议吗？
来自The Key-Input Message Sequence：
If the first responder is a text view, the key event enters the text system. The key window sends the text view a keyDown: message with the event as its argument. The keyDown: method passes the event to handleEvent:, which sends the character input to the input context for key binding and interpretation. In response, the input context sends either insertText:replacementRange:, setMarkedText:selectedRange:replacementRange:, or doCommandBySelector: to the text view.
如果文本视图处理按键事件而滚动视图或其他视图收到 doCommandBySelector: 消息，则不正确。您不能将 doCommandBySelector: 发送给 super，但可以将选择器发送给委托人。