iPad - 根据设备方向（人像或风景）更改图像

Question

在我的viewDidLoad方法中，我应用了一个“加载图像”，该图像出现，直到webView完成加载。我想指定一个不同的加载图像，取决于iPad所处的方向（纵向或横向）。

我发现了this page这是我基于我的代码。

我的代码如下所示。 （这全部包含在我的viewDidLoad方法中）。这只适用于肖像模式。任何想法为什么我的景观代码不被称为？请帮忙！

//detect if iPad  
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { 
//if in Portrait Orientation 
      if([[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortrait) { 
       loadingImage = [UIImage imageNamed:@"webView-load-image-Portrait~ipad.png"]; 
       loadingImageView = [[UIImageView alloc] initWithImage:loadingImage]; 
       loadingImageView.animationImages = [NSArray arrayWithObjects: 
                [UIImage imageNamed:@"webView-load-image-Portrait~ipad.png"], 
                nil]; 
      } 
//if in Landscape Orientation 
      if([[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationLandscapeLeft 
       || [[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationLandscapeRight) { 
       loadingImage = [UIImage imageNamed:@"webView-load-image-Landscape~ipad.png"]; 
       loadingImageView = [[UIImageView alloc] initWithImage:loadingImage]; 
       loadingImageView.animationImages = [NSArray arrayWithObjects: 
                [UIImage imageNamed:@"webView-load-image-Landscape~ipad.png"], 
                nil]; 
      } 

     } 

UPDATE

我知道你应该能够使用图像文件名修改器，从而使设备会自动拉正确的图像。我试图把网页浏览式的负载image.png在我的应用程序文件夹中的图像与所有正确的扩展名（从文件名去掉-Portrait~ipad）：

• WebView的负载图像〜iphone.png
• [email protected]~iphone.png
• 网页视图的负载图像 - 风景〜ipad.png
• [email protected]~ipad.png
• 网页视图的负载图像 - 肖像〜ipad.png
• [email protected]~ipad.png

，它仍然没有工作:(

Answer 1

我想出了自己。下面是我在任何情况下，什么工作是其他具有相同的问题：

//ViewController.h 
@interface ViewController : GAITrackedViewController { 
    // ...other code 
    UIImage *loadingImage; 
} 

@property(nonatomic, strong) UIImageView *loadingImageView; 


//ViewController.m 
    - (void)viewDidLoad 
    { 
     [super viewDidLoad]; 

     ...bunch of other code.... 

    // Subscribe to device orientation notifications, and set "orientation" - will return a number 1-5, with 5 being "unknown". 
     [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications]; 
     UIInterfaceOrientation orientation = [UIDevice currentDevice].orientation; 

    //**************** Start Add Static loading image ****************/ 
     //if iPhone 
     if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) { 
     loadingImage = [UIImage imageNamed:@"webView-load-image~iphone.png"]; 
     loadingImageView = [[UIImageView alloc] initWithImage:loadingImage]; 
      loadingImageView.animationImages = [NSArray arrayWithObjects: 
               [UIImage imageNamed:@"webView-load-image~iphone.png"], 
               nil]; 
     } 

     if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { 
      if(orientation == 3 || orientation == 4) { 
       loadingImage = [UIImage imageNamed:@"webView-load-image-Landscape~ipad.png"]; 
       loadingImageView = [[UIImageView alloc] initWithImage:loadingImage]; 
       loadingImageView.animationImages = [NSArray arrayWithObjects: 
                [UIImage imageNamed:@"webView-load-image-Landscape~ipad.png"], 
                nil]; 
       NSLog(@"Set webView-load-image iPhone Landscape"); 

      } 
      if(orientation == 5) { 
       NSLog(@"Set webView-load-image UNKNOWN"); 
      } 
      if(orientation == 1) { 
       loadingImage = [UIImage imageNamed:@"webView-load-image-Portrait~ipad.png"]; 
       loadingImageView = [[UIImageView alloc] initWithImage:loadingImage]; 
       loadingImageView.animationImages = [NSArray arrayWithObjects: 
                [UIImage imageNamed:@"webView-load-image-Portrait~ipad.png"], 
                nil]; 
       NSLog(@"Set webView-load-image iPad Portrait"); 
      } 


     } 

     [self.view addSubview:loadingImageView]; 
     // End Add Static loading image 

Answer 2

我回头一看，在应用前，我在工作的同时，我在做类似的事情。这是我得到它的工作...

我创建以处理方向的变化的方法...

BOOL isPortraitView = YES; 

@implementation MyViewController 
{ 
    // a bunch of code... 

    - (void)setOrientation:(UIInterfaceOrientation)interfaceOrientation 
    { 
     if (UIInterfaceOrientationIsPortrait(interfaceOrientation)) 
     { 
      isPortraitView = YES; 

      // do other stuff 
     } 
     else 
     { 
      isPortraitView = NO; 

      // do other stuff 
     } 
    } 

    // other code... 
} 

它接受一个UIInterfaceOrientation值，所以你不必使用状态bar方法（如果我没有记错的话，那个方法不是最好的/最可预测的）。我还存储一个类级布尔值以供快速参考。然后我用willRotateToInterfaceOrientation方法调用它。

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration 
{ 
    [self setOrientation:toInterfaceOrientation]; 
} 

这还可以处理加载过程中的方向更改。

Answer 3

高兴你理解了它，但在上帝的份，除去硬编码数值为导向！有宣告此枚举：

typedef NS_ENUM(NSInteger, UIDeviceOrientation) { 
    UIDeviceOrientationUnknown, 
    UIDeviceOrientationPortrait,   // Device oriented vertically, home button on the bottom 
    UIDeviceOrientationPortraitUpsideDown, // Device oriented vertically, home button on the top 
    UIDeviceOrientationLandscapeLeft,  // Device oriented horizontally, home button on the right 
    UIDeviceOrientationLandscapeRight,  // Device oriented horizontally, home button on the left 
    UIDeviceOrientationFaceUp,    // Device oriented flat, face up 
    UIDeviceOrientationFaceDown    // Device oriented flat, face down 
}; 

和

typedef NS_ENUM(NSInteger, UIInterfaceOrientation) { 
    UIInterfaceOrientationPortrait   = UIDeviceOrientationPortrait, 
    UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown, 
    UIInterfaceOrientationLandscapeLeft  = UIDeviceOrientationLandscapeRight, 
    UIInterfaceOrientationLandscapeRight  = UIDeviceOrientationLandscapeLeft 
}; 

而且你应该检查你的viewController的interfaceOrientation，而不是设备的方向。

此外，检查出下面的宏：

UIInterfaceOrientationIsPortrait(orientation) 
UIInterfaceOrientationIsLandscape(orientation) 

您的代码应该看起来更像是：

UIInterfaceOrientationIsLandscape(self.interfaceOrientation) { 
    // show landscape image 
} else { 
    // show portrait image 
}