-self parentViewController- dismissModalViewController not working on iOS 5 - objective-c

Question

So, any clue on this? I had to use [self dismiss modalviewcontroller to dismiss modalviews. Funny fact: when dismissing a tabbarcontroller I could still use the reference to parentviewcontroller, when dismissing a regular viewcontroller, not.

Answer 1

On iOS 5 you will need to use the presentingViewController selector instead of the parentViewController selector.

Answer 2

-(UIViewController *)getParentViewController{
float currentVersion = 5.0;
float sysVersion = [[[UIDevice currentDevice] systemVersion] floatValue];
if (sysVersion >= currentVersion) {
// iOS 5.0 or later version of iOS specific functionality hanled here
return self.presentingViewController;
}
else {
//Previous than iOS 5.0 specific functionality
return self.parentViewController;
}
}

Answer 3

The app i have in the store was built using ios SDK 4.3 and uses self.parentViewController dismissModalViewControllerAnimated:YES. It continues to work with IOS 5 devices. I thought it would since it was built on sdk 4.3. Now when i'm updating it with the new xcode and ios 5.0 sdk, it will not work as is and i have to change all the view closing stuff to use the conditional selector workaround mentioned above.(yuck!)
Just thought i'd mention that dismissing from the parent should work on ios 5 (at least in my case with the ios 4.3 sdk). I can't speak for previous sdks or other selectors with parentViewController.

Answer 4

I have built a category that add presentingViewController on iOS 4.
It disables itself on iOS 5.
You can use it seamlessly. Please see backward-modal.

Answer 5

For your particular use case of dismissing the modal view controller, you may want to keep in mind the second paragraph of the Discussion section in Apple's documentation for -dismissModalViewControllerAnimated:.
The parent view controller is responsible for dismissing the modal
view controller it presented using the
presentModalViewController:animated: method. If you call this method
on the modal view controller itself, however, the modal view
controller automatically forwards the message to its parent view
controller.
If you call this method on the modal view controller itself, however,
the modal view controller automatically forwards the message to its
parent view controller.
Jason's solution is also great and helpful! Thanks!

Answer 6

I found a nice blog post explaining this issue:
http://omegadelta.net/2011/11/04/oh-my-god-they-killed-parentviewcontroller/
Following this post I created a category method for UIViewController:
- (UIViewController*) myParentViewController {
UIViewController* ret = [self parentViewController];
if(ret == nil) {
if([self respondsToSelector:#selector(presentingViewController)]) {
ret = [self presentingViewController];
}
}
return ret;
}