自动更新UITabBar项目徽章值 [英] Auto-update UITabBar item badge value

问题描述

在我的应用程序中有UITabBar项，我希望标签栏项的徽章值每X秒更新一次，但我不太清楚...

In my app there UITabBar items, I want the badge value of the tab bar item to be updated every X seconds, but I can't quite figure it out...

这是我的更新方法:

-(void)updateTabBadgeValue{

    NSLog(@"tick");


    if([PFUser currentUser]!=nil){
        NSLog(@"user is not null");
        UIStoryboard *mySb = [UIStoryboard storyboardWithName:@"Main_iPhone" bundle:nil];

        UITabBarController *myTbc = [mySb instantiateViewControllerWithIdentifier:@"tbc"];
        NotificationNavigation *nn = [myTbc viewControllers][2];

        NotificationViewController *nvc = [nn viewControllers][0];
         [nvc awakeFromNib];
       PFQuery *query = [PFQuery queryWithClassName:@"NoCo"];
        [query whereKey:@"username" equalTo:[[PFUser currentUser]username]];
        PFObject *noco = [query getFirstObject];
        if([[noco objectForKey:@"count"] intValue] > 0){
            NSLog(@"tock");
            [nn.tabBarItem setBadgeValue:[NSString stringWithFormat:@"%d",[[noco objectForKey:@"count"] intValue]]];
            [myTbc viewDidLoad];
            [myTbc viewWillAppear:YES];
            [nvc viewDidLoad];
            [nvc viewWillAppear:YES];

        }


    }
}

我实现了这样的方法:

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
   [NSTimer scheduledTimerWithTimeInterval:5.0 target:self selector:@selector(updateTabBadgeValue) userInfo:nil repeats:YES];

       }

但是它似乎不起作用...我的日志输出显示"tick"，"user is not null"，"tock"，每5秒按此顺序进行，所以我知道该方法正在被调用，但是徽章值未更新

but it doesn't seem to be working...my log output shows "tick", "user is not null", "tock", in that order every 5 seconds so I know the method is being called but the badge value is not being updated

推荐答案

最终，最终有效的方法是使用以下方法放置NSTimer:

Ultimately, what ended up working was putting the NSTimer with this method:

-(void)updateTabBadgeValue{

    NSLog(@"tick");


    if([PFUser currentUser]!=nil){
        NSLog(@"user is not null");
        //UIStoryboard *mySb = [UIStoryboard storyboardWithName:@"Main_iPhone" bundle:nil];

        //UITabBarController *myTbc = [mySb instantiateViewControllerWithIdentifier:@"tbc"];
        //NotificationNavigation *nn = [myTbc viewControllers][2];

        //NotificationViewController *nvc = [nn viewControllers][0];
        //[nvc awakeFromNib];
        PFQuery *query = [PFQuery queryWithClassName:@"NoCo"];
        [query whereKey:@"username" equalTo:[[PFUser currentUser]username]];
        PFObject *noco = [query getFirstObject];
        if([[noco objectForKey:@"count"] intValue] > 0){
            NSLog(@"tock");
            //for(UIViewController *controller in myTbc.viewControllers){
                //if(controller.tabBarItem.tag == 101){
                    [self.tabBarItem setBadgeValue:[NSString stringWithFormat:@"%d",[[noco objectForKey:@"count"] intValue]]];

                    //[myTbc viewDidLoad];
                    //[myTbc viewWillAppear:YES];
                    //[nvc viewDidLoad];
                    //[nvc viewWillAppear:YES];
                //}
            //}

        }
        else{
            NSLog(@"pause");
        }


    }
}

进入具有tabBarItem

into the -(void)awakeFromNib method of the view controller that had the tabBarItem

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