仅在Tabbar-Application（横向纵向）中的一个选项卡上更改视图？

如何在旋转iphone（更换笔尖）时更改视图。但它应该只发生在一个单一的标签！我试了一下：仅在Tabbar-Application（横向纵向）中的一个选项卡上更改视图？

- (void)viewDidLoad { 
LandscapeViewController *viewController = [[LandscapeViewController alloc] 
      initWithNibName:@"LandscapeView" bundle:nil]; 
self.landscapeViewController = viewController; 
[viewController release]; 

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications]; 
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChanged:) 
      name:UIDeviceOrientationDidChangeNotification object:nil]; } 

- (void)orientationChanged:(NSNotification *)notification 
{ 
    [self performSelector:@selector(updateLandscapeView) withObject:nil afterDelay:0]; 
} 

- (void)updateLandscapeView 
{ 
    UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation; 
    if (UIDeviceOrientationIsLandscape(deviceOrientation) && !isShowingLandscapeView) 
{ 
     [self presentModalViewController:self.landscapeViewController animated:YES]; 
     isShowingLandscapeView = YES; 
    } 
else if (deviceOrientation == UIDeviceOrientationPortrait && isShowingLandscapeView) 
{ 
     [self dismissModalViewControllerAnimated:YES]; 
     isShowingLandscapeView = NO; 
    }  
}

但随后的景观，景观出现在所有选项卡。（当这个代码加载一次）。有什么想法？

来源

2010-02-08 x2on

坦克为您的意见！我发现了一个解决方法：

//Remove Observer if not in Landscape 
- (void)viewDidDisappear:(BOOL)animated { 
    if (isShowingLandscapeView == NO) { 
     [[NSNotificationCenter defaultCenter] removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil]; 
    } 
} 

//Add Observer if not in Landscape 
- (void)viewDidAppear:(BOOL)animated { 
    if (isShowingLandscapeView == NO) { 
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChanged:) name:UIDeviceOrientationDidChangeNotification object:nil]; 
    } 
}

来源

2010-02-12 11:09:53 x2on