Objective c UIImagePickerController相机在翻转和取消几次后会冻结

你好，我在一个带摄像头的应用程序中工作

我能正确地打开和使用相机。但我发现了一个bug：

当我打开相机时，翻转相机，再次翻转相机并按取消。做几次3-5。再次打开相机，我有一个黑色的冻结屏幕几秒钟，如果你拍照，看到的图像，但屏幕继续在黑色。几秒钟后，相机再次出现，您可以继续正常操作。但我找不到解决办法

我在网上搜索了很多，找到了一些答案，但没有任何东西能解决我的问题

这里有一个类似的问题，但解决方案对我不起作用：

我还使用DejalBezelActivityView创建带有标签的微调器区域

有什么想法吗

我有我的.h声明：

@property (nonatomic, strong) UIImagePickerController* picker;

- (void) takePhoto: (id)vc;
- (void) selectPhoto: (id)vc;

和我的.mm代码：

@synthesize picker = _picker;

- (id) init{
self = [super init];

if (self){
    self.picker = [[UIImagePickerController alloc] init];

}
return self;
}



- (void)takePhoto:(id)vc{
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
    [VC_Camera showAlert];
    return;
}

[self init];
self.picker.delegate = self;
self.picker.allowsEditing = YES;
self.picker.sourceType = UIImagePickerControllerSourceTypeCamera;
self.picker.cameraDevice = UIImagePickerControllerCameraDeviceRear;

[[VC_Camera getMainWindow] presentViewController:self.picker animated:YES completion:NULL];
}

- (void)selectPhoto:(id)vc{
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]){
    [VC_Camera showAlert];
    return;
}

[self init];    
self.picker.delegate = self;
self.picker.allowsEditing = YES;
self.picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

[[VC_Camera getMainWindow] presentViewController:self.picker animated:YES completion:NULL];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {

self.picker = picker;

DejalActivityView * _activityView = [DejalBezelActivityView activityViewForView:[[UIApplication sharedApplication] keyWindow]  withLabel:@"Loading"];

  [self performSelector:@selector(cancelAfterDelay:) withObject:@{@"DejalAV":_activityView} afterDelay:1.0];

}


- (void) cancelAfterDelay:(NSDictionary*) dict
{

DejalActivityView* _activityView = [dict objectForKey:@"DejalAV"];

[DejalBezelActivityView removeViewAnimated:YES];

[self.picker dismissViewControllerAnimated:YES completion:nil];
}

谢谢：D

[更新]

我尝试将UIImagePickerController用作单例：

-(UIImagePickerController *) imagePicker{
if(!_imagePicker){
   _imagePicker = [[UIImagePickerController alloc] init];
   _imagePicker.delegate = self;
   if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
       _imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
   }
   else{
       _imagePicker.sourceType =UIImagePickerControllerSourceTypePhotoLibrary;
   }  
}
return _imagePicker;
}

---

问题依然存在

这是一个非常晚的回答，但对于那些仍在努力解决这个问题的人来说：我注意到，当某个东西正在备份主线程，或者在单独的线程上影响图形上下文时，似乎会发生这种情况。这些可能是开始寻找的地方