Open book animation only plays sporadically on iOS 6

[jgale]

When run on a device, sometimes it displays, sometimes it doesn't. It always seems to display in the simulator.

I don't know that I've ever seen it actually work on iPad on an actual device.

[alexsaidani]

The animation works perfectly fine in iOS 6, (both in simulator and on device) you must be observing another issue? Have you got it sorted as of yet?

[jgale]

For me, it works very reliably in the simulator but only occasionally on the device on iOS 6. I don't think I've ever seen it on the iPad, I see it on my iPhone only very occasionally. Do you see it 100% reliably on your device?

[alexsaidani]

Yeah I can see it 100% of the time on both iPhone and iPad iOS 5-6 (simulator too), although it is very difficult to implement into an app upon opening. Are you getting this simply when running the sample project?

[jgale]

Thanks for the tip! You are right, my demo project works 100% of the time but it's very sporadic when integrated into my real app. At least that gives me something to look into.

[alexsaidani]

How are you going about implementing it into your app?

[alexsaidani]

Okay I found a much better way of doing this that is 10 times simpler. Stick the following code in your app delegate - didFinishLaunchingWithOptions

    //1. add the image to the front of the view...
        UIImageView *splashImage = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
        [splashImage setImage: [UIImage imageNamed:@"Default"]];
        [self.window.rootViewController.view addSubview:splashImage];
        [self.window.rootViewController.view bringSubviewToFront:splashImage];

        //2. set an anchor point on the image view so it opens from the left
        splashImage.layer.anchorPoint = CGPointMake(0, 0.5);

        //reset the image view frame
        splashImage.frame = CGRectMake(0, -20, 320, 480);

        //3. animate the open
        [UIView animateWithDuration:1.5
                              delay:0.0
                            options:(UIViewAnimationCurveEaseOut)
                         animations:^{

                             splashImage.layer.transform = CATransform3DRotate(CATransform3DIdentity, -M_PI_2, 0, 1, 0);
                         } completion:^(BOOL finished){

                             //remove that imageview from the view
                             [splashImage removeFromSuperview];
                         }];

[alexsaidani]

You can then use the following to adjust for iPhone 5 screen size. A bit fragmented but it works perfectly.

if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
{
CGSize result = [[UIScreen mainScreen] bounds].size;
if(result.height == 480)
{
// iPhone Classic
}
if(result.height == 568)
{
// iPhone 5
}
}

[jgale]

Interesting, your approach is a lot cleaner. It has a few problems that makes it not work for me though:

• Most importantly, it doesn't work with iPad, because I need to be able to check self.interfaceOrientation to decide what image to load. I can't think of any other way to check what orientation we are in when in didFinishLaunchingWithOptions. Any ideas?
• It's missing the perspective aspects of the 3D transform, but that's easy to add in
• The setting of -20 on the frame messed it up on mine, I needed mine to be at 0,0. Maybe this depends on your status bar settings in your app.
• Also, you might want to be careful with checking for if height == 480 or 568, since those are CGFloats and checking equality that way is risky.

[jgale]

However, after playing around with this I realized why the animation wasn't working on my own real app.

I was using an animation duration of 0.5, and it just wouldn't show up often. Switching it to use a duration of 1.0 seemed to make it long enough that it actually showed up on my app.