我是一名经验丰富的C/C++程序员,但却是ObjC的新成员.我正试图在Mac OSX项目中捕获NSWorkspacedidmountnofification.
我将回调添加到我的app delegate界面.
- (void)mediaMounted:(NSNotification *)notification;
实施包括
- (void)mediaMounted:(NSNotification *)aNotification {
NSLog(@"mediaMounted volume change.");
}
在我的applicationDidFinishLaunching中,我将自己添加到通知中心.
NSNotificationCenter* ncenter = [[NSWorkspace sharedWorkspace] notificationCenter];
[ncenter addObserver: self
selector: @selector(mediaMounted)
name: NSWorkspaceDidMountNotification
object: nil];
但是,当我运行并装载磁盘时,我看到:
2012-08-29 09:52:31.753 OSN[2203:903] -[OSNAppDelegate mediaMounted]: unrecognized selector sent to instance 0x101340af0
2012-08-29 09:52:31.756 OSN[2203:903] -[OSNAppDelegate mediaMounted]: unrecognized selector sent to instance 0x101340af0
我确认Instance 0x101340af0是我的OSNAppDelegate self,但我不明白我还需要做什么,以便识别选择器.
最佳答案 你的选择器应该是:
mediaMounted:不是mediaMounted.
您的实现将NSNotification作为参数,而不是任何内容.
您可以通过以下方式验证选择
if( [self respondsToSelector:@selector(mediaMounted)] )
{
NSLog(@"Good to go");
}
例:
// this selector
@selector(test)
// will call this method
- (void)test{ }
// but this selector, noting the :
@selector(test:)
// would call this method
- (void)test:(id)sender{ }
您可以阅读有关选择器here的信息.