xcode ios 6 shake motion calls IBaction from previous view

Question

I'm a bit new to app development. In a viewController ( VPviewController ) i have the following code:

- (void) motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event{
    if (motion == UIEventSubtypeMotionShake){       
        [self startGame:nil];
    }   
}

In a different viewController ( VPgameViewController ) i have a different MotionShake event:

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event{
    if(event.subtype == UIEventSubtypeMotionShake){
        if(count < 3 ){

            [self changeText:nil];
            AudioServicesPlaySystemSound(1016);
            count++;

         }else{

            count = 0;
            AudioServicesPlaySystemSound(1024);
            UIStoryboard *storyboard = self.storyboard;
            VPpoepViewController *shit = [storyboard instantiateViewControllerWithIdentifier:@"PoepViewController"];
           shit.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
           [self presentViewController:shit animated:YES completion:nil];
        }
    }
}

When i'm in the VPgameView and i shake the Iphone it's also calling the startGame function which is in a different viewController shake event.

How can i stop this?

Dyspepsia

Maybe this (https://mcmap.net/q/800146/-motionbegan-not-working) helps – Welterweight

In both views i have can become first responder and resign first responder. But that's not helping. – Dyspepsia

Do you want to detect the motion in Xcode or in iOS? If the latter, please don't confuse iOS with Xcode. One doesn't need Xcode for writing iOS applications. – Internationale

Answer 1

Sounds like you have to unsubscribe your VPViewController from receiving the shake event notifications in its viewWillDisappear: function.

Generally, if you want your viewController to receive certain event notifications only when visible you should subscribe to the notification in the viewWillAppear: function and unsubscribe in the viewWillDisappear: function.

Alix

What is the best way to do this? – Dyspepsia

To control if a viewController responds to a shake gesture you should introduce a BOOL respondsToShakeGesture class variable for the viewController. In the motionBegan and motionEnded functions return immediately if this bool value is false. Finally, in the viewWillAppear: function set the bool value to true and in the viewWillDisappear: function set the bool value to false. – Alix