Objective c dock显示或隐藏时的事件

当Dock显示或隐藏时，如何获取事件？

如果Dock可见或未使用碳，则可以获取通知。我不知道用可可做这件事的方法

（我还没有测试过这个；它来自代码）

创建回调方法：

#import <Carbon/Carbon.h>

static const EventTypeSpec appEvents[] = {
    { kEventClassApplication, kEventAppSystemUIModeChanged }
};

OSStatus DockChangedHandler(EventHandlerCallRef inCallRef, EventRef event, void *userData) {
    OSStatus status = eventNotHandledErr;
    switch(GetEventClass(event)) {
        case kEventClassApplication: {
            SystemUIMode *outMode;
            SystemUIOptions *outOptions;
            GetSystemUIMode(outMode, outOptions);
            status = noErr;
        }
            break;

        default: 
            return;

    }

    /*Insert whatever you want to do when you're notified of a dock change*/

    return status;
}

进一步资料：

    InstallApplicationEventHandler(NewEventHandlerUPP(DockChangedHandler), GetEventTypeCount(appEvents), appEvents, 0, NULL);