选择取消按钮错误后的 iOS 11 UIImagePickerController

Question

我正在使用 UIImagePickerController 选择照片和裁剪图像。

这和之前看到的情况是一样的 https://forums.developer.apple.com/thread/88286

这是我的代码:

- (void) onTest:(UIButton *)btn {
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
    picker.delegate = self;
    picker.allowsEditing = YES;
    [picker setModalPresentationStyle: UIModalPresentationOverCurrentContext];
    [self presentViewController:picker animated:YES completion:nil];
}

这是 View 层。我没有添加这个 UIView。我无法按下取消按钮，也无法放大/缩小。

iOS 10 没有问题。我只有 iOS 11 有问题。

Answer 1

我有一个解决这个问题的好主意。

将 Controller (您从中显示 UIImagePickerController)设置为 UIImagePickerController 的委托(delegate)，然后从 开始符合 UINavigationControllerDelegate UIImagePickerController是UINavigationController的子类，那么实现方法:

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
  if ([UIDevice currentDevice].systemVersion.floatValue < 11) {
    return;
  }
  if ([viewController isKindOfClass:NSClassFromString(@"PUPhotoPickerHostViewController")]) {
    weakify(viewController);
    [viewController.view.subviews enumerateObjectsUsingBlock:^(__kindof UIView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
      if (obj.frame.size.width < 42 && FLOAT_EQUAL(obj.frame.size.height, [[UIScreen mainScreen] bounds].size.height)) {
        strongify(viewController);
        [viewController.view sendSubviewToBack:obj];
        *stop = YES;
      }
    }];
  }
}