Get the current displaying UIViewController on the screen in AppDelegate.m

user_1297382 0
Viewed 198491

The current UIViewController on the screen need to response to push-notifications from APNs, by setting some badge views. But how could I get the UIViewController in methodapplication:didReceiveRemoteNotification: of AppDelegate.m?

I tried use self.window.rootViewController to get the current displaying UIViewController, it may be a UINavigationViewController or some other kind of view controller. And I find out that the visibleViewController property of UINavigationViewController can be used to get the UIViewController on the screen. But what could I do if it is not a UINavigationViewController?

Any help is appreciated! The related code is as following.

AppDelegate.m

...
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {

    //I would like to find out which view controller is on the screen here.

    UIViewController *vc = [(UINavigationViewController *)self.window.rootViewController visibleViewController];
    [vc performSelector:@selector(handleThePushNotification:) withObject:userInfo];
}
...

ViewControllerA.m

- (void)handleThePushNotification:(NSDictionary *)userInfo{

    //set some badge view here

}
push-notification uiviewcontroller iphone ios
20 Answers

Regarding NSNotificationCenter Post above (sorry can't find out where to post a comment under it...)

In case some were getting the -[NSConcreteNotification allKeys] error of sorts. Change this:

-(void)didReceiveRemoteNotification:(NSDictionary *)userInfo

to this:

-(void)didReceiveRemoteNotification:(NSNotification*)notif {
NSDictionary *dict = notif.userInfo;
}
user_17480110

Always check your build configuration if you you are running your app with debug or release.

IMPORTANT NOTE: You can't be able to test it without running your app in debug mode

This was my solution

user_20606050

In Swift, just add this single line of code to your BaseViewController to log your displayed view controllers

override public func viewDidLoad() {

super.viewDidLoad()

print("Current ViewController ‍♂️  #\(UIApplication.getTopViewController()?.classForCoder ?? self.classForCoder)")

}

user_124347230
Related