Created
August 7, 2013 04:58
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UIPanGestureRecognizer for creating parallax effect on an image view with text view
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| - (IBAction)handlePanGesture:(UIPanGestureRecognizer*)gesture | |
| { | |
| CGPoint translation = [gesture translationInView:self.view]; | |
| if (gesture.state == UIGestureRecognizerStateChanged) { | |
| // user is swiping, translate the view for the image by 1/4 the translation, and the text by 1/2 the translation to give parallax effect | |
| self.currentSlide.imageView.frame = CGRectMake(self.currentSlide.imageView.frame.origin.x+translation.x/4,0,self.currentSlide.imageView.frame.size.width, self.currentSlide.imageView.frame.size.height); | |
| self.currentSlide.slideText.view.frame = CGRectMake(self.currentSlide.slideText.view.frame.origin.x+translation.x/2,0,self.currentSlide.slideText.view.frame.size.width, self.currentSlide.slideText.view.frame.size.height); | |
| // save the cumulative translation and reset the local translation | |
| self.panTranslation += translation.x; | |
| [gesture setTranslation:CGPointZero inView:self.view]; | |
| } | |
| if (gesture.state == UIGestureRecognizerStateCancelled || gesture.state == UIGestureRecognizerStateFailed) | |
| { | |
| // gesture was interrupted, reset the view and clear the translation | |
| [self resetSlideView]; | |
| self.panTranslation = 0; | |
| } | |
| if (gesture.state == UIGestureRecognizerStateEnded) | |
| { | |
| // gesture finished. If swipe is past threshold, perform left or right swipe animation. Otherwise, reset the view. | |
| CGPoint velocity = [gesture velocityInView:self.view]; | |
| if(abs(self.panTranslation) > (self.view.bounds.size.width*.15)) { | |
| if(velocity.x < 0) { | |
| [self swipeLeft]; | |
| } else { | |
| [self swipeRight]; | |
| } | |
| } else { | |
| [self resetSlideView]; | |
| } | |
| self.panTranslation = 0; | |
| } | |
| } |
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