iphone - UIWebView 在横向 View 右侧加载一些黑屏

Question

我正面临这个奇怪的问题，这不是正常行为。我正在从 WebView 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，没问题。但是在人像中，如果我放大、缩小并双击图像以适合屏幕，然后如果我现在更改为风景，我可以看到右侧出现白/黑屏幕。

我用谷歌搜索了这个问题，我尝试了很多方法，比如不透明属性、透明颜色等。甚至我尝试了自己的方法来解决这个问题，但我失败了。如何解决该问题？

Answer 1

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完整代码。需要正确地将所有代码放入 View Controller

为此，我设置了捏合手势，以便当用户倾斜 UIwebView 时，可以检查 UIwebView 的缩放大小。

     //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。返回 NO 不能保证阻止同时识别，因为其他手势的委托(delegate)可能返回 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将 Web View 捏合/捏合，只需设置缩放系数即可。 以便 WebView 可以在 Oreintaion 更改时调整其 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;
     }
     }

     }

即使用户倾斜 UIWebView，这也能完美工作。