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Changing leftBarButtonItem with flip transition?

In my code I programmatically change leftBarButtonItem with a UIButton to a UIActivityIndicatorView, I would like to know how to perform a flip transition when changing, any idea ?

Thanks a lot.

Solution

  • I have a feeling that to do a flip transition, you need to have a UIView.

    So.. you could make a custom barButtonItem and add to it a flipView:

    UIView *flipView = [[UIView alloc] init....];
BarButtonItem *barbutton = [[BarButtonItem alloc] initWithCustomView:flipView];

    then add your original view to the flipView, this can contain whatever you like...

    [flipView addSubview:<original view>];

    Then to flip this into a UIActivityIndicatorView, I think you need to do something like this:

    [UIView beginAnimations:@"flip" context:NULL];
[UIView setAnimationDuration:1];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:flipView cache:YES];

[<original view> removeFromSuperView];
[flipView addSubview:<activityIndicatorView>];
    
[UIView commitAnimations];

    You'll probably have to keep a reference to your flipView somewhere so you can bring back a reference to it when you want to perform the flip.