UINavigationController在IOS 8中損壞？

Question

我在我的應用程序中有一系列UIViewControllers，並且這些都是使用UINavigationController呈現的。 HOME ViewController調用pushViewController進入PROFILES ViewController。 PROFILES屏幕正確顯示返回按鈕到HOME。然後在PROFILES上選擇一個按鈕將使用戶進入DETAIL ViewController。 DETAIL屏幕正確顯示PROFILES的後退按鈕。但是當我將後退按鈕按下到PROFILES時，我確實回到PROFILES屏幕，但屏幕上的導航欄現在顯示標題HOME，沒有後退按鈕。換句話說，看起來IOS8已經彈出ViewController一次從細節返回到PROFILES，但以某種方式彈出導航欄項目兩次！

任何想法如何解決這個問題？

Answer 1

顯然，解決方案的輪廓可以在這裏找到： UINavigationController and UINavigationBarDelegate.ShouldPopItem() with MonoTouch

在我的解決方案，我只是有我所有的視圖控制器擴展CustomUINavigationController，它看起來像這樣：

#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