- (void)viewWillAppear:(BOOL)animated detect custom animation

Question

I have a button which when pressed pushes a view controller however i'm using a custom animation so pushViewController: childController animated: is set to NO. What i want to do though is detect this custom animation in my - (void)viewWillAppear:(BOOL)animatedmethod and write an if statement like this;

- (void)viewWillAppear:(BOOL)animated { 
     if (customAnimation occured) {//Do this} 
     else {//Do this}
}

This is the method for my button which pushes the view controller.

- (void)nextPressed:(id)sender {
    childController = [[CategoryOneDetailController alloc] initWithNibName:xibDownName bundle:nil];
    [UIView  beginAnimations: @"Showinfo"context: nil];
    [UIView setAnimationCurve: UIViewAnimationCurveEaseInOut];
    [UIView setAnimationDuration:0.75];
    [self.navigationController pushViewController: childController animated:NO];
    [UIView setAnimationTransition:UIViewAnimationTransitionCurlDown forView:self.navigationController.view cache:NO];
    [UIView commitAnimations];
    [childController release];
}

Any help would be much appreciated, thanks, Sami.

score 1 · Accepted Answer · answered Jun 23 '11 at 08:37

1

If you don't use standard animations, I think your best bet is to add a property to your pushed view controller that is set to YES in case of a custom animation (and NO by default to not break any existing behavior). Then you can check that property in viewDidAppear:.

If you need your custom logic to be executed after the animation has run, you might want to set up an animation completion handler or block.

answered Jun 23 '11 at 08:37

Eiko

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Thanks, for the response, how would i add a property to my view controller, sorry i'm still learning. – Sami Jun 23 '11 at 08:40
1

Just like any other code you write. Add a variable `BOOL usesCustomAnimation;` and `@property BOOL usesCustomAnimation;`in your controller's .h file, and `@synthesize usesCustomAnimation;`in your .m file. Then, after you alloc/init your controller, just do `childController.usesCustomAnimation = YES;`. – Eiko Jun 23 '11 at 08:44
Thanks, it all worked great, i was on the right track, was using an NSString instead of a BOOL however i was missing this part 'childController.usesCustomAnimation = YES;'. – Sami Jun 23 '11 at 09:12
I don't suppose you could help with another small issue, when the nextPressed method is called i would like to hide a label then run the custom animation, so i added the following code [label setAlpha:0]; before the animation however it doesn't work the label is not hidden so i tried adding a timer before the animation [NSThread sleepForTimeInterval:1]; but still no luck, any idea why? – Sami Jun 23 '11 at 09:25
Check if label is nil, maybe it's not connected. – Eiko Jun 23 '11 at 09:44
I added the label programmatically, and i know it works because if i disable the the pushing of the view controller so that if the button is pressed just the label is hidden then it works, it just doesn't work when i have both. – Sami Jun 23 '11 at 10:18
It should. Maybe put this up with some code as another question. – Eiko Jun 23 '11 at 10:43

- (void)viewWillAppear:(BOOL)animated detect custom animation

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