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    <p>I finally found a way. I probably found the error. What i have done is cutting the branch on which i am sitting. I was releasing the view controller which i am currently in:) When viewdidDisappear called, there is no such view controller. Because i throw away it to space already.Below is my working steps. I hope it will be useful to someone. But i cant stand thinking of apple may reject my app. I wish finding a suitable way. </p> <p><strong>This is my working ultimate way of using split view controller and navigation controller as window root view controller alternately.</strong></p> <p>Firstly i defined NavigationController and SplitViewController property in AppDelegate interface.</p> <pre><code>AppDelegate.h @property (assign,nonatomic) UINavigationController * NC; @property (assign,nonatomic) UISplitViewController *SVC; </code></pre> <p>Secondly i assign newly created NC on AppDelegate didFinishLaunch event.</p> <pre><code>AppDelegate.m //Creating my main screen controller //Creating my navigation controller with my view controller instance. Then self.NC= my_navigation_controller; self.window.rootViewController= self.NC; </code></pre> <p>Thirdly creating a splitview controller and setting as app's root view controller</p> <pre><code> MyMainScreen.m -(void) OpenSplit() { //Creating my master view controller of SVC //Creating my detail view controller of SVC //Creating my SVC; AppDelegate * app_delegate= [[UIApplication sharedApplication] delegate]; app_delegate.SVC= newly created my SVC; app_delegate.window.rootViewController= app_delegate.SVC; } </code></pre> <p>Fourthly releasing unused NC in viewDidLoad event of detail view of SVC.</p> <pre><code>MyDetailView.m - (void) viewDidLoad() { ... AppDelegate * app_delegate= [[UIApplication sharedApplication] delegate]; app_delegate.NC= nil; //i dont need it now. i am releasing. Releasing Navigation Controller release as well child controllers. I learned with testing. } </code></pre> <p>Fifthly managing close split view function.I used UIBarButton on NavigationBar in DetailView.</p> <pre><code>MyDetailView.m -(void) closeSplitView { //Creating navigation controller with my main screen view controller AppDelegate * app_delegate= [[UIApplication sharedApplication] delegate]; app_delegate.NC= newly_created_NC; app_delegate.window.rootViewController= appdelegate.NC; } </code></pre> <p>Sixthly handling unused split view controller in Main Screen viewDidLoad event.</p> <pre><code> MyMainScreen.m -(void) viewDidLoad { AppDelegate * app_delegate= [[UIApplication sharedApplication] delegate]; app_delegate.SVC= nil; //I am releasing it because i am working with NC now. } </code></pre>
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