Strange behavior of NavigationBar after multiple push and pop with animation NO. iOS7

Question

Problem while multiple pop and push operation performed on UINavigationController programmatically with animation NO. ( iOS7 iPhone Only )

Source Code https://github.com/abhishek9284/NavigationBarTest

To understand problem consider following view tree.
( I use UITableViewController in my application )
Right click and select open image in new tab to see large image.

Bug Info
Right click and select open image in new tab to see large image.

Bug/Problem occurs while performing following navigations.

1. Push one by one view manually and goto D view.
   (PUSH : Root > Alphabets > A > B > C > D)
2. Pop multiple views at once programmatically using popToViewController and go back to Root view.
   (POP : Root < Alphabets < A < B < C < D)
3. Push programmatically and goto 2 view.
   (PUSH : Root > Numbers > 1 > 2)

in above step 2 and 3 pop and push done programmatically with animation NO, which makes UINavigationBar back button and title very strange.

NOTE : Above problem occurs only in iOS 7 & work perfectly in iOS 6.

Answer 1

★☆★　SOLVED　★☆★

Reason for problem

• Doing push or pop inside -(void)viewDidAppear:(BOOL)animated method makes navigation stack unstable.

Solution

• Create separate method for push or pop related process and call that method from another view controller (avoid push or pop inside -(void)viewDidAppear:(BOOL)animated)

• After push operation call method [self.navigationController.view layoutSubviews]; which lays out subviews.

Answer 2

For technical accuracy, one should not call layoutSubviews directly, even though it does work. Check Apple documentation for more info.