在iphone sdk中使用DEFacebookComposeViewController时出现白色背景问题

我正在使用DEFacebookComposeViewController在Facebook上共享

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我在一个视图控制器中遇到问题，它将视图的背景颜色更改为白色，而不是透明的黑色背景。

我设法解决了这个问题。您需要取消注释以下文件中的代码： “损坏BookComposeViewController.h”

只需替换以下代码：

• （无效）视图将显示：（BOOL）动画 { [超级视图将显示：动画]

  // Take a snapshot of the current view, and make that our background after our view animates into place.
  // This only works if our orientation is the same as the presenting view.
  // If they don't match, just display the gray background.
    if (self.interfaceOrientation == self.fromViewController.interfaceOrientation) {
  //        UIImage *backgroundImage = [self captureScreen];
  //        self.backgroundImageView = [[[UIImageView alloc]               initWithImage:backgroundImage] autorelease];
     }
     else {
     //            self.backgroundImageView = [[[UIImageView alloc] initWithFrame:self.fromViewController.view.bounds] autorelease];
  }
        //    self.backgroundImageView.autoresizingMask = UIViewAutoresizingNone;
  //    self.backgroundImageView.alpha = 0.0f;
  //    self.backgroundImageView.backgroundColor = [UIColor lightGrayColor];
  //    [self.view insertSubview:self.backgroundImageView atIndex:0];
  
  // Now let's fade in a gradient view over the presenting view.
     self.gradientView = [[[DEFacebookGradientView alloc] initWithFrame:[UIApplication sharedApplication].keyWindow.bounds] autorelease];
     self.gradientView.autoresizingMask = UIViewAutoresizingNone;
     self.gradientView.transform = self.fromViewController.view.transform;
     self.gradientView.alpha = 0.0f;
     self.gradientView.center = [UIApplication sharedApplication].keyWindow.center;
     [self.fromViewController.view addSubview:self.gradientView];
     [UIView animateWithDuration:0.3f
               animations:^ {
                   self.gradientView.alpha = 1.0f;
               }];    
  
     self.previousStatusBarStyle = [UIApplication sharedApplication].statusBarStyle;
     [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackOpaque animated:YES]; 
  
     [self updateFramesForOrientation:self.interfaceOrientation];
  
        }
  

使用此代码：

   - (void)viewWillAppear:(BOOL)animated
   {
       [super viewWillAppear:animated];

    // Take a snapshot of the current view, and make that our background after our view animates into place.
    // This only works if our orientation is the same as the presenting view.
    // If they don't match, just display the gray background.
if (self.interfaceOrientation == self.fromViewController.interfaceOrientation) {
    UIImage *backgroundImage = [self captureScreen];
    self.backgroundImageView = [[[UIImageView alloc] initWithImage:backgroundImage] autorelease];
}
else {
    self.backgroundImageView = [[[UIImageView alloc] initWithFrame:self.fromViewController.view.bounds] autorelease];
}
self.backgroundImageView.autoresizingMask = UIViewAutoresizingNone;
self.backgroundImageView.alpha = 0.0f;
self.backgroundImageView.backgroundColor = [UIColor lightGrayColor];
[self.view insertSubview:self.backgroundImageView atIndex:0];

    // Now let's fade in a gradient view over the presenting view.
self.gradientView = [[[DEFacebookGradientView alloc] initWithFrame:[UIApplication sharedApplication].keyWindow.bounds] autorelease];
self.gradientView.autoresizingMask = UIViewAutoresizingNone;
self.gradientView.transform = self.fromViewController.view.transform;
self.gradientView.alpha = 0.0f;
self.gradientView.center = [UIApplication sharedApplication].keyWindow.center;
[self.fromViewController.view addSubview:self.gradientView];
[UIView animateWithDuration:0.3f
                 animations:^ {
                     self.gradientView.alpha = 1.0f;
                 }];    

self.previousStatusBarStyle = [UIApplication sharedApplication].statusBarStyle;
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackOpaque animated:YES]; 

[self updateFramesForOrientation:self.interfaceOrientation];

   }

希望这将有助于其他人，如果他们发现类似的问题

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谢谢。

无需对代码中的任何地方进行更改，只需在实现模块中替换此代码即可

self.modalPresentationStyle = UIModalPresentationCurrentContext;

与

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您的工作将完成。

请注意，只有当我在添加的子视图上按viewController时，才会发生这种情况。它工作正常。这为我解决了问题。我希望我首先了解导致它的原因。事实上，该行是错误的。它是针对viewController内部代码的。而不是外部实现。

appDelegate.window.rootViewController.modalPresentationStyle = UIModalPresentationCurrentContext;