UINavigationController custom transition animation view controller alpha value

Question

I want to make a transition, that in the end, the ToViewController alpha value will be something like 0.7, so the user still be able to see the FromViewController" at the background.

Why am I doing it? because at the end of transition I need to remove the FromViewController.

score 1 · Answer 1 · edited Jul 23 '16 at 11:16

1

An easy way is to take snapshot of the view controller at run time and navigate your desired controller with passing snapshot image and make it a background image of ToView Controller, so it will look like you are on a same page.

-(UIImage *)takeSnapshot:(UIView *)snapView {

    UIGraphicsBeginImageContextWithOptions(snapView.frame.size, NO, [UIScreen mainScreen].scale);

    [snapView drawViewHierarchyInRect:snapView.bounds afterScreenUpdates:NO];

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

edited Jul 23 '16 at 11:16

Praveen Kumar Purushothaman

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answered Jul 23 '16 at 11:07

Rohit Jha

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Looks like a good solution, but I am pretty sure there is much simpler elegant one. I saw a tutorial for this, but can't find it anymore. – Daniel Rahamim Jul 23 '16 at 11:11
@RohitJha Use four tabs to indent codes. Please read the [tour] and answer. Welcome to Stack Overflow. – Praveen Kumar Purushothaman Jul 23 '16 at 11:16

UINavigationController custom transition animation view controller alpha value

1 Answers1