Swiping A View with Gestures - iphone

Question

I am trying to develop an application to Iphone; but i am new-bee so i have got a lot of problems.
My application has got a default view and another small view in the main view that name is flashcard.
I want to add capability this view swiping (or sliding) like Photos in Iphone. For example if user swipes view until the inner view's center reaches bounds of main view there will be two possibilities,
1- if user finish swiping before reach inner view will return to original position.
2- if user don't stop swiping, inner view will go out at screen from swipe direction and return the screen from the opposite direction.
So i declare UIPanGestureRecognizer at viewDidLoad like below
UIPanGestureRecognizer *panFlashCard = [[UIPanGestureRecognizer alloc]
initWithTarget:self action:#selector(handlePanFlashCard:)];
[flashcard addGestureRecognizer:panFlashCard];
[panFlashCard release];
handPanFlashCard action:
UIView *piece = [recognizer view];
CGPoint center = piece.center;
CGFloat x = 160; // the original x axis of inner view
if ([recognizer state] == UIGestureRecognizerStateChanged) {
CGPoint translation = [recognizer translationInView:piece ];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.55];
[piece setCenter:CGPointMake(piece.center.x + translation.x, center.y)];
[UIView commitAnimations];
CGFloat totalX;
totalX= x + translation.x;
if(translation.x <0)
{
if (totalX <= 0)
{
[self showNextCard];
}
else
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.55];
[piece setCenter:CGPointMake(self.view.center.x, center.y)];
[UIView commitAnimations];
}
}
else
{
if (totalX >= self.view.bounds.size.width)
{
[self showPreviousCard];
}
else
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.55];
[piece setCenter:CGPointMake(self.view.center.x, center.y)];
[UIView commitAnimations];
}
}
}
showNextCard action:
[flashcard setCenter:CGPointMake(self.view.bounds.size.width + flashcard.bounds.size.width, flashcard.center.y)];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.55];
[flashcard setCenter:CGPointMake(self.view.center.x, flashcard.center.y)];
[UIView commitAnimations];
showPreviousCard action:
[flashcard setCenter:CGPointMake(0 - flashcard.bounds.size.width, flashcard.center.y)];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.55];
[flashcard setCenter:CGPointMake(self.view.center.x, flashcard.center.y)];
[UIView commitAnimations];
When i run this application, it builds and runs successfully but there is something wrong with animations, some frame mistakes i think.
Please help me to correct this code and run fluent animations while swiping.

Answer 1

If I understand what you are trying to do then you can just use built in controls for this. Take a look at the pagingEnabled property on the UIScrollView class. There is also a sample project called PhotoScroller that may help.
http://developer.apple.com/library/ios/#samplecode/PhotoScroller/Introduction/Intro.html