UIView animations that interact poorly

Question

I see what seems to be the interaction between the individual animations, and I am very grateful for any suggestions to eliminate this effect.

Basically: I have an iPhone app that includes an “a” button in the root view. Pressing "a" calls up the view on the controller stack of the navigation view with flip animation. The extended view has a button to display the view back to the root.

Main code:

- (IBAction)pushOneView{
TheAppDelegate *delegate = [[UIApplication sharedApplication] delegate];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationTransition: UIViewAnimationTransitionFlipFromRight 
                    forView:delegate.navigationController.view cache:NO];
[delegate.navigationController 
            pushViewController:oneViewController animated:NO];
[UIView commitAnimations];

}

This seems like normal, and the animation is pretty smooth.

The root view also includes a preview ("panelView") and another button "b". panelView can display either of the other two sub-items - by pressing "b" swaps between these subzones, with rotation animations. Code:

-(IBAction)swapPanels{
UIViewController *coming;
UIViewController *going;
float rotation;

if (self.aPanel.view.superview == nil) {
    coming = aPanel;
    going = bPanel;
    rotation = 3.14;
}
else {
    coming = bPanel;
    going = aPanel;
    rotation = -3.14;
}

// First half of spin
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.25];
CGAffineTransform swirlTransform = CGAffineTransformMakeRotation(rotation);
panelView.transform = swirlTransform;
[panelView setAlpha:0.1];
[UIView commitAnimations];

// Finish spin
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.25];
CGAffineTransform secondTransform = 
                        CGAffineTransformRotate(swirlTransform, rotation);
panelView.transform = secondTransform;
[panelView setAlpha:1];
[UIView commitAnimations];

// Swap the panels
[going.view removeFromSuperview];
[panelView insertSubview:coming.view atIndex:0];

}

. .

, "a" , "b" . , , "a" , . "b" . "a" ... "a" , .

100% . , . - . "b" ( ), "a" "sw" "b" . , . "a" , "b" , , , , ( ).

, : . "a" , "b" - - , "b" . , ? ? ...?

.

Answer 1

"b" . begin/commit, . "b" , , . , , , .

, :

[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:@selector(rotationAnimationFinished:finished:context:)];

'b' ( " " ). ,

- (void)rotationAnimationFinished:(NSString *)animationID finished:(BOOL)finished context:(void *)context;

, , , "b" ( "Finish spin" ).

, .

Answer 2

, , : , - "b" , . , , transform View "b" ... , , , View.

, , , , "b" , View : CGAffineTransformIdentity:

• (void) spinFinished: (NSString *) ID : (BOOL) : (void *) context { panelView.transform = CGAffineTransformIdentity; }

-'b ' ' a ', , . , , . .