ios - segue 和 NavigationController 导航有什么问题

Question

这是该线程的延续/替代:popToRootViewControllerAnimated problem以更有条理和更容易理解的方式找出问题/错误是什么。

在 VC3 中按下后退按钮时，我想返回到 VC1。

我有以下设置:

以下代码:

VC1:

@implementation ViewController
- (IBAction)myButton1:(id)sender {

//Call InformationViewController for Quick Game
[self performSegueWithIdentifier:@"toVC2" sender:self];


}

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end

VC2:

@implementation nrTwoViewController
- (IBAction)myButton2:(id)sender {
//Call InformationViewController for Quick Game
[self performSegueWithIdentifier:@"toVC3" sender:self];

}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
    // Custom initialization
}
return self;
}

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end

VC3:

@implementation nrThreeViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
    // Custom initialization
}
return self;
}

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.


}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[self.navigationController popToRootViewControllerAnimated:YES];
}


@end

我只弹出到 VC2，而不是根目录 (VC1)，并且在 VC3 上按返回按钮时收到以下消息:

2013-10-15 08:36:08.479 segueTest[44153:a0b] nested pop animation can result in corrupted navigation bar
2013-10-15 08:36:08.831 segueTest[44153:a0b] Finishing up a navigation transition in an unexpected state. Navigation Bar subview tree might get corrupted.

我也按照建议尝试添加 UINavigationBarDelegate:

@interface nrThreeViewController : UIViewController <UINavigationBarDelegate>

...和:

- (BOOL)navigationBar:(UINavigationBar *)navigationBar shouldPopItem:(UINavigationItem *)item {
[self.navigationController popToRootViewControllerAnimated:YES];
return NO;
}

结果:

pop'ed from VC3 to VC2 only with no messages in the console.

Answer 1

问题是您放置 [self.navigationController popToRootViewControllerAnimated:YES]; 的错误消息是 Finishing up a navigation transition in an unexpected state. 这是因为当调用 viewWillDisappear 时， View 已经开始从屏幕上过渡，然后您将调用另一个过渡。尝试将它放在一个简单地弹出到 Root View Controller 的按钮操作中，看看是否能解决您的问题。