How to handle keyboard events in subclass of NSViewController?

问题

I am creating one cocoa application having wizard like structure.

All dialogs are subclass of NSViewController. Currently I am not able get keyboard events such as keyDown and keyUp..

Please help me to solve this problem....

Thanks in advance....

回答1:

Override keyDown: and keyUp: method.

-(void)keyUp:(NSEvent*)event
-(void)keyDown:(NSEvent*)event

and

- (BOOL)acceptsFirstResponder {
    return YES;
}

In subclass of NSViewController you should refer Cocoa Event-Handling Guide .

回答2:

If you are trying to simply get an event for escape, use this instead:

override var acceptsFirstResponder: Bool {
    return true
}

override func cancelOperation(_ sender: Any?) {
    // The user pressed escape
}

回答3:

Setting window to "Auto Recalculates View Loop" in Inteface Builder has worked for me.

来源：https://stackoverflow.com/questions/8148714/how-to-handle-keyboard-events-in-subclass-of-nsviewcontroller