嵌套推送动画可能导致导航栏损坏错误答案

【问题标题】：nested push animation can result in corrupted navigation bar error嵌套推送动画可能导致导航栏损坏错误
【发布时间】：2012-07-06 06:08:41
【问题描述】：

据我所知，我不相信我做错了什么，但是我得到了：

2011-04-02 14:55:23.350 AppName[42430:207] nested push animation can result in corrupted navigation bar
2011-04-02 14:55:23.352 AppName[42430:207] nested push animation can result in corrupted navigation bar
2011-04-02 14:55:23.729 AppName[42430:207] Finishing up a navigation transition in an unexpected state. Navigation Bar subview tree might get corrupted.
2011-04-02 14:55:23.729 AppName[42430:207] Finishing up a navigation transition in an unexpected state. Navigation Bar subview tree might get corrupted.

这是我的代码

- (IBAction) btnGetCurrentLocation{
    [SVProgressHUD showWithStatus:@"Getting current location..."];
    locationManager = [[CLLocationManager alloc] init];
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    locationManager.delegate = self;
    [locationManager startUpdatingLocation];
    [SVProgressHUD dismiss];
}

- (void)locationManager:(CLLocationManager *)manager 
    didUpdateToLocation:(CLLocation *)newLocation 
           fromLocation:(CLLocation *)oldLocation {

    [locationManager stopUpdatingLocation];
    CLLocationCoordinate2D coordinate = newLocation.coordinate;

    LocationMapViewController *locationMapViewController = [[LocationMapViewController alloc] initWithNibName:@"LocationMapViewController_iPhone" bundle:nil];
    locationMapViewController.title=@"Your Title";
    locationMapViewController.centerOfMap = &(coordinate);
    [self.navigationController pushViewController:locationMapViewController animated:YES]; 

}

我用谷歌搜索了它，但是大多数地方都在谈论放置动画：不，但是我在下一个屏幕上看不到地图。

【问题讨论】：

查看stackoverflow.com/questions/5525519/…

标签： ios uinavigationcontroller pushviewcontroller

【解决方案1】：

每次 CLLocationManager 通知来自同一控制器的位置更改时，您都会推送一个新控制器。这会导致嵌套导航。尝试在第一次通知您时在该控制器中保存对 LocationMapViewController 的引用，然后检查它以通知它：

if (self.locationController == null){
     LocationMapViewController *locationMapViewController = [[LocationMapViewController alloc] initWithNibName:@"LocationMapViewController_iPhone" bundle:nil];
    locationMapViewController.title=@"Your Title";
    locationMapViewController.centerOfMap = &(coordinate);
    [self.navigationController pushViewController:locationMapViewController animated:YES]; 
}else{
    [self.locationController locationDidChangeTo: &(coordinate)];
}

另一种选择是在 LocationMapViewController 中创建 CLLocationManager...

【讨论】：

【解决方案2】：

我发现另一种解决方案可以将我的所有代码转换为情节提要，并且walla，它又可以工作了。甜的。它并不像看起来那么难，干杯，tronnick

【讨论】：

【解决方案3】：

确保您没有同时将两个或多个UIViewControllers 推入导航堆栈。

【讨论】：

欢迎来到stackoverflow。如果您通过参考和/或一些解释来改进您的答案，那就太好了。

【解决方案4】：

我不能 100% 确定这是否解决了您的具体问题，但是当我试图在视图控制器出现之前弹出一个视图控制器时，我收到了 nested pop animation can result in corrupted navigation bar 消息。覆盖viewDidAppear 以在您的 UIViewController 子类中设置一个标志，指示视图已出现（请记住也调用[super viewDidAppear]）。在弹出控制器之前测试该标志。如果视图尚未出现，您可能需要设置 another 标志，表明您需要在视图控制器出现后立即从viewDidAppear 中弹出它。像这样：

@interface MyViewController : UIViewController {
    bool didAppear, needToPop;
}

...在@implementation...

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    didAppear = YES;
    if (needToPop)
        [self.navigationController popViewControllerAnimated:YES];
}

- (void)myCrucialBackgroundTask {
    // this task was presumably initiated when view was created or loaded....
    ...
    if (myTaskFailed) {  // o noes!
        if (didAppear)
            [self.navigationController popViewControllerAnimated:YES];
        else
            needToPop = YES;
    }
}

重复的popViewControllerAnimated 调用有点难看，但我可以让它在我目前疲倦的状态下工作的唯一方法。

【讨论】：