CODEWITHSUNDEEP
objective-cxcodeiphone-sdk-3.0shake
Radix
Radix

Reputation: 3657

How to detect shake motion in iPhone

On the shake of the iPhone device i want some function to be called, i dont know how to recognize shake so i tried some link and tried this code

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    if(event.type == UIEventSubtypeMotionShake)
    {
        NSLog(@"called");
        [self.view setBackgroundColor:[UIColor greenColor]];
    }
}

- (BOOL)canBecomeFirstResponder
{ 
return YES; 
}

But alas no luck so can you please let me know how i can do the same

Thanks and Regards

Upvotes: 14

Views: 13744

Answers (4)

Shengsheng
Shengsheng

Reputation: 1

Things become easier with SSEventListener. Your view controller doesn't need to override motionEnded:withEvent: any more! With SSEventListener, you can listener for shake event as simple as this:

[viewController ss_setShakeEventListener:^{ ... }];

Upvotes: 0

Bjørn Egil
Bjørn Egil

Reputation: 2458

To globally handle shake across all screens of your app, you can subclass UIWindow and implement motionEnded, since the event will bubble up the responder chain until it reaches the window-object. Example using Xamarin:

public class MyWindow : UIWindow
{
    public MyWindow(CoreGraphics.CGRect frame)
        : base (frame)
    { }

    public override void MotionEnded (UIEventSubtype motion, UIEvent evt)
    {
        if (motion == UIEventSubtype.MotionShake) {
            Console.WriteLine ("Shake received");
        }
    }
}

Next, in AppDelegate, implement the window method to return an instance of your UIWindow subclass. Example using Xamarin:

public class AppDelegate : UIApplicationDelegate
{
    UIWindow _window;

    public override UIWindow Window 
    { 
        get
        {
            if (_window == null) {
                _window = new MyWindow (UIScreen.MainScreen.Bounds);
            }

            return _window;
        }
        set
        {
        }
    }

    // ...
}

Voilà, shake is handled across the whole app.

Upvotes: 0

Thomas Stone
Thomas Stone

Reputation: 287

You could do something like this...

Firstly...

Set the applicationSupportsShakeToEdit property in the App's Delegate:

- (void)applicationDidFinishLaunching:(UIApplication *)application {

    application.applicationSupportsShakeToEdit = YES;

    [window addSubview:viewController.view];
    [window makeKeyAndVisible];
}

Secondly...

Add/Override canBecomeFirstResponder, viewDidAppear: and viewWillDisappear: methods in your View Controller:

-(BOOL)canBecomeFirstResponder {
    return YES;
}

-(void)viewDidAppear:(BOOL)animated {
   [super viewDidAppear:animated];
   [self becomeFirstResponder];
}

- (void)viewWillDisappear:(BOOL)animated {
    [self resignFirstResponder];
    [super viewWillDisappear:animated];
 }

Thirdly...

Add the motionEnded method to your View Controller:

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
   if (motion == UIEventSubtypeMotionShake)
   {
    // your code
   }
 }

That should work if the first answer did not and this is only quickly typed not tested:)

Upvotes: 2

Radix
Radix

Reputation: 3657

As per the above comments discussed i am answering my question so that others can read the solution that i have got

In the UIResponder class documentation it is said that the motion events will respond to the first responder only so what i did was add just a small function and that did the trick for me, so here's my solution

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    if(event.type == UIEventSubtypeMotionShake)
    {
        NSLog(@"called");
        [self.view setBackgroundColor:[UIColor greenColor]];
    }
}

- (BOOL)canBecomeFirstResponder
{ 
return YES; 
}

Now still i was not able to detect any shake motion so all i had to do was to make my viewcontroller the first responder and for that here's the code that i used

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [self becomeFirstResponder];
}

and i was done

This was the solution that i came up with

Thanks and Regards

Upvotes: 34

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