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下面的代码创建一个弹出框控制器，UIImagePickerController它使用 cameraOverlayView 来显示一个打开照片库的自定义按钮。

这在 iOS 5 上效果很好，但在 iOS 6 上，“拍照”按钮不见了，取而代之的是 - 在前置和后置摄像头按钮之间还有另一个切换！

请参阅以下屏幕截图 -

缺少拍照按钮

这是代码 - UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;

if ( ![UIImagePickerController isSourceTypeAvailable: sourceType] ) {
    [self openLibrary: sender];
    return;
}

UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.sourceType = sourceType;

UIButton *libraryButton = [UIButton buttonWithType: UIButtonTypeCustom];
libraryButton.frame = CGRectMake(12, 12, self.photoLibraryIcon.size.width, self.photoLibraryIcon.size.height);
[libraryButton setImage: self.photoLibraryIcon forState: UIControlStateNormal];
[libraryButton addTarget: self action: @selector(openLibrary:) forControlEvents: UIControlEventTouchUpInside];

[picker.cameraOverlayView addSubview:libraryButton];

__imagePickerPopoverController = [[UIPopoverController alloc] initWithContentViewController: picker];
self.imagePickerPopoverController.delegate = self;

[self.imagePickerPopoverController presentPopoverFromRect: CGRectMake(self.center.x - 5, self.center.y - 5, 10, 10)
                                                   inView: self.superview
                                 permittedArrowDirections: UIPopoverArrowDirectionAny
                                                 animated: YES];

如果我删除[picker.cameraOverlayView addSubview:libraryButton]，它可以正常工作，但是我的自定义按钮将消失（如预期的那样）。

那么为什么要分配cameraOverlayView更改底部工具栏呢？

关于如何让“拍照”按钮回到 iOS 6 的任何线索？

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