ios - 分配 cameraOverlyView 属性时未调用 UIImagePickerController didFinishPickingMediaWithInfo

Question

我设置了一个 UIImagePickerController 模态视图来录制视频，一旦用户选择“使用视频”，它就会关闭 View Controller 并执行我想要的操作。然而，一旦我添加了一个 cameraOverlayView，它只是一个 UIView，没有任何特别的事情发生，didFinishPickingMediaWithInfo 就永远不会被调用。即使我将 NSLog 放在该函数的第一行，我也看不到任何输出。更奇怪的是，当用户按下取消按钮时，UIImagePickerControllerDidCancel 仍然会被调用。

之前关于 SO 的建议似乎没有帮助，因为我已经设置了委托(delegate)并相应地设置了编辑属性，这与这些流行的帖子不同:

uiimagepickercontroller didfinishpickingmediawithinfo NOT CALLED when selecting a video from the library

> UIImagePickerController didFinishPickingMediaWithInfo not being called

这是启动 UIImagePickerController 的代码(取自 Ray Wenderlich 教程):

-(BOOL)startCameraControllerFromViewController:(UIViewController*)controller
                                 usingDelegate:(id )delegate {

    if (([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera] == NO)
        || (delegate == nil)
        || (controller == nil)) {
        return NO;
    }

     if(![delegate conformsToProtocol:@protocol(UIImagePickerControllerDelegate) ]) {        
        NSAssert(nil, @"delegate muste conforms to UIImagePickerControllerDelegate protocol");
    }else{
         NSLog(@"delegate does conform to protocol");
     }  

    CGRect screenRect = [[UIScreen mainScreen]bounds];
    CGFloat screenWidth = screenRect.size.width;
    CGFloat screenHeight = screenRect.size.height;
    CameraOverlay *overlay = [[CameraOverlay alloc]initWithFrame:CGRectMake(0, 0, screenWidth, screenHeight)];
    UIImagePickerController *cameraUI = [[UIImagePickerController alloc] init];
    cameraUI.sourceType = UIImagePickerControllerSourceTypeCamera;
    cameraUI.delegate = delegate;
    cameraUI.mediaTypes = [[NSArray alloc] initWithObjects:(NSString *)kUTTypeMovie, nil];
    cameraUI.allowsEditing = NO;
    //if I comment out the line below, everything works fine.
    //but if I don't comment this out, didFinishPickingMediaWithInfo is never called
    cameraUI.cameraOverlayView = overlay;
    [controller presentModalViewController: cameraUI animated: YES];
    return YES;
}

这是 didFinishPickingMediaWithInfo 的一部分:

(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    NSLog(@"did finish picking media with info");

    NSString *mediaType = [info objectForKey: UIImagePickerControllerMediaType];
    [self dismissModalViewControllerAnimated:NO];
    // I also tried [picker dismissModalViewControllerAnimated:NO];
    //despite it not being its own delegate, but in any case
    //this did not change the result

...
}

我按照 Andrey 的建议添加了有效的委托(delegate)检查，但现在我总是看到“委托(delegate)确实符合协议(protocol)”，无论覆盖是否在其中以及 didFinishPickingMediaWithInfo 是否被调用。

对于尝试什么或代码中的错误有什么建议吗？感谢您查看。

Answer 1

这是最终起作用的方法:将叠加 View 的 userInteractionEnabled 设置为 FALSE。

我希望我知道这是错误还是功能。我查看了一些创建叠加 View 的教程，但都没有提到设置此属性。如果有人能完全解释为什么这会产生影响，我想标记一个比这更完整的答案。