如何在方向更改時管理應用程序？

Question

我有一個應用程序，我正在改變屏幕方向。但是，當我更改第一個屏幕的方向並轉到下一個屏幕時，更改不會持續。

附加的圖像爲了更清楚的理解。

的主要問題是設備旋轉時，則第一屏幕旋轉，但第二次沒有出現在新的方向發射。
只有在屏幕啓動後我們改變方向時，它纔會旋轉。

我該如何解決這個問題？

Answer 1

的問題是，當你旋轉設備，然後

(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 

方法被調用，但是當你去到下一個屏幕，則此方法不會被調用。如果您再次旋轉設備，則會調用該方法。

因此，如果您想要將下一個屏幕方向更改爲設備當前方向，請使用viewDidLoad方法或ViewWillApper()方法檢查設備的當前方向。然後根據這個設定你當前的觀點。

Answer 2

調用此方法。

-(void) viewWillAppear:(BOOL)animated{ 
    UIInterfaceOrientation orientation = [[UIDevice currentDevice] orientation]; 

    [self willAnimateRotationToInterfaceOrientation:orientation duration:0]; 

} 

-(void) willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration 
{ 
    if(toInterfaceOrientation == UIInterfaceOrientationPortrait || toInterfaceOrientation == UIInterfaceOrientationPortraitUpsideDown) 
    { 


    enter code here 
    set frame......... 
    } 
    else if(toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft || toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) 
    { 

     set frame......... 

    } 


} 
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { 
    // Overriden to allow any orientation. 
    return YES; 
} 

Answer 3

Use this buddy... 

If suppose, you are adding UIImageView to your self.view as 

**in .h**, 

UIImageView *topView 

**in .m**, 

    topView = [[UIImageView alloc] initWithImage: 
       [UIImage imageNamed:@「anyImage.png"]]; 
    topView.userInteractionEnabled = YES; 

    UIInterfaceOrientation interfaceOrientation = [UIApplication sharedApplication].statusBarOrientation; 

    if(interfaceOrientation == UIInterfaceOrientationLandscapeLeft || interfaceOrientation == UIInterfaceOrientationLandscapeRight) 
    { 
     topView.frame = // set your dimensions as per landscape view 
    } 
else if(interfaceOrientation == UIInterfaceOrientationPortrait || interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown) 
    { 
     topView.frame = // set your dimensions as per portrait view 

} 


    [self.view addSubView : topView]; 

**Add this lines at end of your viewDidLoad.** 

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



**And the method** 

    - (void)didRotate:(NSNotification *)notification 
    { 
    UIDeviceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation; 
    CGRect screenBounds = [[UIScreen mainScreen] bounds]; 

    switch (orientation) 
    { 
     case UIInterfaceOrientationLandscapeLeft: 
     { 
      topView.frame = // set your dimensions as per landscape view 
      break; 
     } 
     case UIInterfaceOrientationLandscapeRight: 
     { 
      topView.frame = // set your dimensions as per landscape view 
      break; 
     } 
     case UIInterfaceOrientationPortraitUpsideDown: 
     { 
      topView.frame = // set your dimensions as per portrait view 
      break; 
     } 
     case UIInterfaceOrientationPortrait: 
     { 
      topView.frame = // set your dimensions as per portrait view 
      break; 
     }   
    } 
} 


    - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{ 
    // Return YES for supported orientations 
    return YES; 
} 

編碼快樂..