Problem with shakes: viewDidAppear isn't called when loading viewController

fede · 02-25-2010, 09:14 AM

I'm trying to detect a shake on the iPhone device, so for what i've read I need to set my view controller as first responder on the viewDidAppear method. This method is supposed to be called automatically, but for some reason this method is never called. Only viewDidLoad is called.

this is my code (I put only the relevant parts):

BuildHouseViewController.h:

Code:

@interface BuildHouseViewController : UIViewController <UIAccelerometerDelegate>{

BuildHouseViewController.m:

Code:

- (void)viewDidLoad {
    [super viewDidLoad];
	[self.view becomeFirstResponder];

Code:

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

-(BOOL)canBecomeFirstResponder {
	return YES;
}

Code:

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event{
	
	NSLog(@"shake"); 
    if ( event.subtype == UIEventSubtypeMotionShake )
    {  }
	
    if ( [super respondsToSelector:@selector(motionEnded:withEvent:)] )
		[super motionEnded:motion withEvent:event];
	
}

I added breakpoints on the viewDidAppear and viewWillAppear methods and they are never called. Shakes are never detected, I suppose it is because as this methods are never called, the view controller can never become first responder. I don't understand why this is happening.

Any help will be appreciated.

fede · 02-25-2010, 10:00 AM

Is it possible that the reason for this is the way I load the view?

I load it from another view using:

Code:

BuildHouseViewController *nextScreen=[[BuildHouseViewController alloc] initWithNibName:@"BuildHouseViewController" bundle:nil];
		[self.view addSubview:nextScreen.view];

bocephus_h@yahoo.com · 10-30-2010, 11:05 PM

I'm having same issue view 1 calls view 2 and in view 2 I have a shake gesture not responding. Did you come up with a solution?

Bertrand21 · 10-30-2010, 11:37 PM

Quote:

Originally Posted by bocephus_h@yahoo.com

I'm having same issue view 1 calls view 2 and in view 2 I have a shake gesture not responding. Did you come up with a solution?

I think the viewdidappear only gets called on a navigation stack not just adding a subview