registerUserNotificationSettings不显示警报

Question

我要求用户允许在iOS 8上使用本地通知，如下所示：

    if ([UIApplication instancesRespondToSelector:@selector(registerUserNotificationSettings:)]){
    UIUserNotificationType types = UIUserNotificationTypeBadge |
    UIUserNotificationTypeSound | UIUserNotificationTypeAlert;
    UIUserNotificationSettings *notificationSettings =
    [UIUserNotificationSettings settingsForTypes:types categories:nil];
    [[UIApplication sharedApplication] registerUserNotificationSettings:notificationSettings];
}

我在AppDelegate中这样处理：

-(void)application:(UIApplication *)application didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings {
[[NSNotificationCenter defaultCenter] postNotificationName:@"didRegisterUserNotificationSettings" object:nil];
}

但是没有显示警报？它会直接跳到委托回调。为什么是这样？我在iOS模拟器中这样做。

谢谢！

Answer 1

仅显示一次警报，要在模拟器上再次显示，请按iOS Simulator - ＆gt; Reset Contents and Settings