iOS导航问题：在推送ViewController后，导致显示前一个ViewController的导航条的导航栏

这种情况很少发生，我不知道如何重现它，但它有时会发生，我会喜欢解决它。iOS导航问题：在推送ViewController后，导致显示前一个ViewController的导航条的导航栏

在ViewController A，如果我在，有时候（不总是）在ViewController B没有出现，导航栏显示的ViewController A导航栏项目，而不是那些ViewController B推ViewController B。如果我点击后退按钮，我不能回到ViewController A，陷入ViewController B。

A UIBarButtonItem已添加到导航条目ViewController A，导航条目ViewController A将根据某些事件进行更新。这是导致这个问题的原因吗？

代码为ViewController A

- (void)viewDidAppear:(BOOL)animated{ 

    [super viewDidAppear:animated]; 

    if(NumberOfCalendarOperations == 0){ 
     [self showNavigatorBarButtons]; 
    } 
    else{ 
     [self startRefreshAnimationOnUpdateButton]; 
    } 
} 



//This method is triggered through notification when the number of operations in calendarOperationQueue is changed 

-(void)calendarOperationQueueStateDidChange:(NSNotification*)notification{ 
    if(NumberOfCalendarOperations == 0){ 

     if (self.isShowActivityIndicator) { 
      dispatch_async(dispatch_get_main_queue(), ^{ 
       [self showNavigatorBarButtons]; 
      }); 
     } 
    } 
    else{ 
     if (!self.isShowActivityIndicator) { 
      dispatch_async(dispatch_get_main_queue(), ^{ 
       [self startRefreshAnimationOnUpdateButton]; 
      }); 
     } 
    } 
}

/** 推ViewController B

ViewControllerB* viewControllerB = [ViewControllerB new]; 
[self.navigationController pushViewController:viewControllerB animated:YES];

代码用于更新导航项*显示在导航栏右侧的更新按钮*/

-(void)showNavigatorBarButtons{ self.isShowActivityIndicator = NO; UIBarButtonItem *updateButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"sync.png"] style:UIBarButtonItemStylePlain target:self action:@selector(updateButtonDidPress:)]; [self.navigationItem setRightBarButtonItems:[NSArray arrayWithObjects:updateButton, nil]];}

/** * 上开始更新按钮 */

-(void)startRefreshAnimationOnUpdateButton{ if (self.navigationController.topViewController != self) { return; } self.isShowActivityIndicator = YES; UIView* updateButtonView = nil; for (UIView *subViewInNavigationBar in self.navigationController.navigationBar.subviews){ NSString *subViewClassAsString = NSStringFromClass([subViewInNavigationBar class]); if ([subViewClassAsString compare:@"UINavigationButton" /* TODO: be careful with this */ options:NSCaseInsensitiveSearch] == NSOrderedSame){ if ([subViewInNavigationBar isKindOfClass:[UIView class]] == YES){ if(updateButtonView == nil){ updateButtonView = subViewInNavigationBar; } else if(subViewInNavigationBar.center.x < updateButtonView.center.x){ updateButtonView = subViewInNavigationBar; } } } } for (UIView *subViewsInButton in updateButtonView.subviews){ if ([subViewsInButton isKindOfClass:[UIImageView class]] == YES && subViewsInButton.frame.origin.x != 0.0f && subViewsInButton.frame.origin.y != 0.0f){ [subViewsInButton removeFromSuperview]; CGRect activityIndicatorFrame = self.updateButtonActivityIndicator.frame; activityIndicatorFrame.origin.x = (CGRectGetWidth(updateButtonView.frame)/2.0f) - (CGRectGetWidth(activityIndicatorFrame)/2.0f); activityIndicatorFrame.origin.y = (CGRectGetHeight(updateButtonView.frame)/2.0f) - (CGRectGetHeight(activityIndicatorFrame)/2.0f); self.updateButtonActivityIndicator.frame = activityIndicatorFrame; [self.updateButtonActivityIndicator startAnimating]; [updateButtonView addSubview:self.updateButtonActivityIndicator]; return; } } }

任何人都得到了一个线索刷新动画？谢谢。

来源

2014-01-24 Jibeex

你是怎么在ViewControllerA中添加栏按钮的？ – channi

任何代码显示？ –

是的，一个UIBarButtonItem被添加到A的导航项中，并且A的导航项将被更新以响应一些事件。 – Jibeex

最后我找到了这个问题的原因。这是我试图隐藏viewWillDisappear中的导航栏。现在iOS允许我通过从屏幕左边缘进行平移来回到前一个视图。但是，从左边缘平移时，如果我取消此操作并平移回左边缘，导航栏将进入此奇怪状态。

来源

2014-09-17 08:32:20 Jibeex

iOS导航问题：在推送ViewController后，导致显示前一个ViewController的导航条的导航栏

回答

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