UINavigationController Broken in IOS 8? - ios

Question

I have a series of UIViewControllers in my app, and these are presented using a UINavigationController. The HOME ViewController calls pushViewController to get to the PROFILES ViewController. The PROFILES screen correctly shows the back button to HOME. Then selecting a button on PROFILES will take the user to the DETAIL ViewController. The DETAIL screen correctly shows the back button to PROFILES. But when I press the back button to PROFILES, I do indeed go back to the PROFILES screen but the navigation bar on that screen now shows the title HOME with no back button. In other words, it appears that IOS 8 has popped the ViewController once to go back from DETAIL to PROFILES, but has somehow popped the navigation bar items twice!
Any idea how I can fix this?

Answer 1

Apparently the solution outline can be found here:
UINavigationController and UINavigationBarDelegate.ShouldPopItem() with MonoTouch
In my solution, I just have all my view controllers extend CustomUINavigationController, which looks like this:
#import "CustomUINavigationController.h"
#import "IOSVersion.h"
#interface CustomUINavigationController ()
#end
#implementation CustomUINavigationController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.delegate=self;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//
// The following two methods are the key to overriding the buggy behavior in IOS 8
// The first method is from here:
// https://stackoverflow.com/questions/6413595/uinavigationcontroller-and-uinavigationbardelegate-shouldpopitem-with-monotouc
//
- (BOOL)navigationBar:(UINavigationBar *)navigationBar shouldPopItem:(UINavigationItem *)item {
NSLog(#"Inside shouldPopItem");
if (regularPop) {
NSLog(#"regularPop is TRUE");
} else {
NSLog(#"regularPop is FALSE");
}
if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(#"8.0")) {
if (regularPop) {
regularPop = FALSE;
return YES;
}
regularPop = TRUE;
[self popViewControllerAnimated:YES];
return NO;
} else {
return [super navigationBar:navigationBar shouldPopItem:item];
}
}
- (UIViewController *)popViewControllerAnimated:(BOOL)animated
{
NSLog(#"Inside popViewControllerAnimated");
if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(#"8.0")) {
NSMutableArray *viewControllers = [NSMutableArray arrayWithArray:self.viewControllers];
int cnt=(int)[viewControllers count];
NSLog(#"Inside popViewControllerAnimated, cnt is %d",cnt);
UIViewController *vc=[viewControllers objectAtIndex:cnt-2];
if (regularPop) self.desiredVC=vc;
[self popToViewController:vc animated:animated];
return vc;
} else {
return [super popViewControllerAnimated:animated];
}
}
- (UIViewController *)manualpopViewControllerAnimated:(BOOL)animated {
NSLog(#"Inside manualpopViewControllerAnimated");
if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(#"8.0")) {
regularPop=TRUE;
return [self popViewControllerAnimated:animated];
} else {
return [super popViewControllerAnimated:animated];
}
}
- (void)navigationController:(UINavigationController *)navigationController
didShowViewController:(UIViewController *)viewController
animated:(BOOL)animated {
NSLog(#"Inside didShowViewController");
if (viewController==self.desiredVC) {
NSLog(#"Inside didShowViewController, found desiredVC");
regularPop = FALSE;
}
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
#end