NSUserNotification 不显示操作按钮

我正在使用这段代码：

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    // Insert code here to initialize your application
    NSUserNotification *notification = [[NSUserNotification alloc] init];
    [notification setTitle: @"Title"];
    [notification setSubtitle: @"Subtitle"];
    [notification setInformativeText: @"Informative Text"];

    [notification setHasActionButton: YES];
    [notification setActionButtonTitle: @"Action Button"];
    [notification setOtherButtonTitle: @"Other Button"];

    [notification setSoundName: NSUserNotificationDefaultSoundName];

    [notification setDeliveryDate: [NSDate dateWithTimeIntervalSinceNow: 10]];
    [[NSUserNotificationCenter defaultUserNotificationCenter] scheduleNotification: notification];
}

我一定会得到，

没有操作按钮或其他按钮。

正如之前的答案中所述，需要将通知类型设置为提醒要显示的操作按钮。如果你想设置你的应用程序的默认通知样式来提醒，你需要定义键NSUserNotificationAlertStyle在 info.plist 中使用值alert.

参见苹果的info.plist 键参考 http://developer.apple.com/library/ios/#documentation/general/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html#//apple_ref/doc/uid/TP40009251-SW1更多细节：

NSUserNotificationAlertStyle指定通知样式是否应为banners, alerts, or none。默认值为banner，这是推荐的样式。