iOS Changing Images using Swap effect(swap transition)

[aliaalia]

Can anyone post some sample codes in order for me to do swap effect on images?? Any generous guy can help me solve the problem?? I want to swap images using touches but i couldnt do it... Example:

-(void) touchesEnded: (NSSet *) touches withEvent: (UIEvent *) event {

.
.
.
}

-(void) touchesBegan: (NSSet *) touches withEvent: (UIEvent *) event {

.
.
.
}

-(void) touchesMoved: (NSSet *) touches withEvent: (UIEvent *) event {

.
.
.
}