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我正面临这个奇怪的问题，而不是正常行为。我正在从 web 视图中的 url 加载图像。如果我将方向从纵向更改为横向，将横向更改为纵向，则没有问题。但是在纵向如果我进行一些放大、缩小并双击图像以适应屏幕，那么如果我现在更改为横向，我可以看到右侧出现白色/黑色屏幕。

我已经用谷歌搜索过这个问题，我尝试了很多方法，比如不透明属性、清晰颜色等。即使我尝试了自己的方法来解决这个问题，但我失败了。如何解决问题？

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1 回答 1

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我发布这个是因为我也遇到了同样的问题，我也解决了这个问题，我的代码如下。下面是可以解决问题的整个代码。需要正确放入所有代码ViewControler

为此，我设置了捏合手势，以便当用户倾斜时UIwebView可以检查缩放大小UIwebView.

     //One This Please import The `UIGestureRecognizerDelegate` Protocol in '.h file' 

     //call below method in ViewDidLoad Method for setting the Pinch gesture 

    - (void)setPinchgesture
    {
     UIPinchGestureRecognizer * pinchgesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(didPinchWebView:)];

    [pinchgesture setDelegate:self];

    [htmlWebView addGestureRecognizer:pinchgesture];
    [pinchgesture release];
   // here htmlWebView is WebView user zoomingIn/Out 

   }

 //Allow The allow simultaneous recognition

    - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer   *)otherGestureRecognizer
   {
     return YES;
   }

返回 YES 保证允许同时识别。不保证返回 NO 会阻止同时识别，因为其他手势的代表可能会返回 YES

 -(void)didPinchWebView:(UIPinchGestureRecognizer*)gestsure
   {
   //check if the Scaled Fator is same is normal scaling factor the allow set Flag True.
    if(gestsure.scale<=1.0)
    {
    isPinchOut = TRUE;

    }
    else// otherwise Set false
    {
    isPinchOut = FALSE;
    }
    NSLog(@"Hello Pinch %f",gestsure.scale);
  }

如果用户在这种情况下捏入/拉出 Web 视图，只需设置 THat Zooming Factor 。这样 WebView 可以随着 Oreintaion 的变化而调整其 ContentSize。

    - (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation   duration:(NSTimeInterval)duration {

   //Allow the Execution of below code when user has Skewed the UIWebView and Adjust the Content Size of UiwebView.

  if(isPinchOut){
  CGFloat ratioAspect = htmlWebView.bounds.size.width/htmlWebView.bounds.size.height;
  switch (toInterfaceOrientation) {
    case UIInterfaceOrientationPortraitUpsideDown:
    case UIInterfaceOrientationPortrait:
        // Going to Portrait mode
        for (UIScrollView *scroll in [htmlWebView subviews]) { //we get the scrollview
            // Make sure it really is a scroll view and reset the zoom scale.
            if ([scroll respondsToSelector:@selector(setZoomScale:)]){
                scroll.minimumZoomScale = scroll.minimumZoomScale/ratioAspect;
                scroll.maximumZoomScale = scroll.maximumZoomScale/ratioAspect;
                [scroll setZoomScale:(scroll.zoomScale/ratioAspect) animated:YES];
            }
        }
        break;

    default:
        // Going to Landscape mode
        for (UIScrollView *scroll in [htmlWebView subviews]) { //we get the scrollview
            // Make sure it really is a scroll view and reset the zoom scale.
            if ([scroll respondsToSelector:@selector(setZoomScale:)]){
                scroll.minimumZoomScale = scroll.minimumZoomScale *ratioAspect;
                scroll.maximumZoomScale = scroll.maximumZoomScale *ratioAspect;
                [scroll setZoomScale:(scroll.zoomScale*ratioAspect) animated:YES];
            }
        }
        break;
     }
     }

     }

这对于即使用户倾斜 UIWebView 也非常有效。

于 2012-11-09T11:19:53.923 回答