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POtouchesBegan doesn't always respond
 

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    <p>I'm detecting a swipe on the screen, and it works exactly the way I want it to. The only thing is, in testing, I keep swiping over and over and over again and at least 90% of the time or more it is responding, but every now and again there is no response.</p> <p>I NSLog'd everything to find the culprit and found that touchesBegan isn't getting detected at all on the few times that this happens.</p> <p>Here's my code, although touchesBegan isn't even getting called so the code shouldn't matter:</p> <pre><code>- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"touches began!"); UITouch *touch = [touches anyObject]; CGPoint thisTouch = [touch locationInView:self.view]; touchstartedX = thisTouch.x; touchstartedY = thisTouch.y; } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { CGPoint p = [[touches anyObject] locationInView:self.view]; if ((abs(p.y - touchstartedY)) &lt; 120) { if ((p.x - touchstartedX) &gt; 10) { [self goPrevious]; } else if ((p.x - touchstartedX) &lt; -10) { [self goNext]; } } else { NSLog(@"too much Y"); } } </code></pre> <p>Any ideas?</p> <p>Thanks!</p> <p><em><strong></em>* EDIT WITH SOLUTION <em>*</em></strong> Here's the code I ended up using after exploring UISwipeGestureRecognizer on dredful's suggestion:</p> <p>in .h:</p> <pre><code>UIViewController &lt;UIGestureRecognizerDelegate&gt; UISwipeGestureRecognizer *swipeLeft; UISwipeGestureRecognizer *swipeRight; @property (nonatomic, retain) UISwipeGestureRecognizer *swipeLeft; @property (nonatomic, retain) UISwipeGestureRecognizer *swipeRight; </code></pre> <p>in .m:</p> <pre><code>@synthesize swipeLeft, swipeRight; UIGestureRecognizer *recognizer; recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)]; self.swipeLeft = (UISwipeGestureRecognizer *)recognizer; swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft; self.swipeLeft = (UISwipeGestureRecognizer *)recognizer; [recognizer release]; recognizer; recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)]; self.swipeRight = (UISwipeGestureRecognizer *)recognizer; swipeRight.direction = UISwipeGestureRecognizerDirectionRight; self.swipeRight = (UISwipeGestureRecognizer *)recognizer; [recognizer release]; [self.view addGestureRecognizer:swipeLeft]; [self.view addGestureRecognizer:swipeRight]; - (void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer { if (recognizer.direction == UISwipeGestureRecognizerDirectionLeft) { [self goNext]; } else { [self goPrevious]; } } - (void)dealloc { [swipeLeft release]; [swipeRight release]; [super dealloc]; } - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; self.swipeLeft = nil; self.swipeRight = nil; } </code></pre>
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