ios - App Delegate的应用程序:didReceiveLocalNotification: not called

Question

在我的应用程序委托(delegate)中，永远不会调用方法 - (void)application:(UIApplication *)application didReceiveLocalNotification: (UILocalNotification *)notification。

这就是我创建通知的方式:

UILocalNotification *notification = [[UILocalNotification alloc] init];
// set UUID, which we will store in userDefaults for later
NSMutableDictionary *myUserInfo = [[NSMutableDictionary alloc] init];
NSString *uuid = [[NSProcessInfo processInfo] globallyUniqueString];
[myUserInfo setValue:uuid forKey:KEY_UUID];
[myUserInfo setValue:@"month" forKey:KEY_UNIT];
[myUserInfo setObject:@YES forKey:KEY_RESCHEDULE];
NSInteger row = [_wurmProphylaxePickerView selectedRowInComponent:0];
switch (row) {
    case 0:
        [myUserInfo setValue:@2 forKey:KEY_FREQUENCY];
        break;
    case 1:
        [myUserInfo setValue:@4 forKey:KEY_FREQUENCY];
        break;
    case 2:
        [myUserInfo setValue:@6 forKey:KEY_FREQUENCY];
        break;
    default:
        [myUserInfo setValue:@4 forKey:KEY_FREQUENCY];
        break;
}
notification.userInfo = myUserInfo;
// calculate date for next notification, depends on the user's selection
NSDate *today = [NSDate date];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *myComps = [[NSDateComponents alloc] init];
[myComps setMinute:1];
notification.fireDate = [calendar dateByAddingComponents:myComps toDate:today options:0];
notification.timeZone = [NSTimeZone localTimeZone];
notification.alertBody = @"My alertBody";
[[UIApplication sharedApplication] scheduleLocalNotification:notification];

这是在我的应用程序委托(delegate)中，但从未被调用:

- (void)application:(UIApplication *)application didReceiveLocalNotification:    (UILocalNotification *)notification
{
    NSDictionary *userInfo = notification.userInfo;
    BOOL repeat = [[userInfo objectForKey:KEY_RESCHEDULE] boolValue];
    if (repeat)
    {
        NSInteger frequency = (NSInteger)[userInfo objectForKey:KEY_FREQUENCY];
        NSString *unit = (NSString *)[userInfo objectForKey:KEY_UNIT];
        NSString *uuid = (NSString *)[userInfo objectForKey:KEY_UUID];

        // calculate date for next notification
        NSDate *today = [NSDate date];
        NSCalendar *calendar = [NSCalendar currentCalendar];
        NSDateComponents *myComps = [[NSDateComponents alloc] init];
        if ([unit isEqualToString:@"month"]) {
            //[myComps setMonth:frequency];
            [myComps setMinute:frequency];
        } else {

        }

        // create new notification
        UILocalNotification *newNotification = [[UILocalNotification alloc] init];
        newNotification.fireDate = [calendar dateByAddingComponents:myComps toDate:today options:0];
        newNotification.timeZone = [NSTimeZone localTimeZone];
        newNotification.alertAction = notification.alertAction;
        newNotification.alertBody = notification.alertBody;
        newNotification.userInfo = notification.userInfo;

        // schedule it
        [[UIApplication sharedApplication] scheduleLocalNotification:newNotification];     
    }
}

在 iOS 8 上测试，不确定 iOS 7...

Answer 1

如果通知触发时应用程序未处于事件状态，您可以在 didFinishLaunchingWithOptions 中处理此问题，如 Local and Push Notifications Programming Guide 的处理本地和远程通知部分中的示例所示:

- (BOOL)application:(UIApplication *)app didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    UILocalNotification *localNotif =
        [launchOptions objectForKey:UIApplicationLaunchOptionsLocalNotificationKey];
    if (localNotif) {
        NSString *itemName = [localNotif.userInfo objectForKey:ToDoItemKey];
        [viewController displayItem:itemName];  // custom method
        app.applicationIconBadgeNumber = localNotif.applicationIconBadgeNumber-1;
    }
    [window addSubview:viewController.view];
    [window makeKeyAndVisible];
    return YES;
}

如果通知触发时应用程序处于事件状态，则会调用 didReceiveLocalNotification。