本机代码捕获图像在IOS 11上抛出异常？

Question

我遇到了一个目标-c代码的问题，它处理打开相机来拍摄一张照片，代码作为本机代码注入到一个代码中。

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
            imagePicker = [[UIImagePickerController alloc] init];
            imagePicker.delegate = self;


            imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
            NSArray *mediaTypes = [[NSArray alloc]initWithObjects:(NSString *)kUTTypeImage, nil];
            imagePicker.mediaTypes = mediaTypes;
            imagePicker.cameraDevice = UIImagePickerControllerCameraDeviceRear;
            [[[[[UIApplication sharedApplication] delegate] window] rootViewController] presentViewController:imagePicker animated:YES completion:nil];
        }else{
            [self showAlert:@"No Camera Privilege On This Device"];
        }

问题是，当上面的代码在iOS-11上执行时，我可以从codenameone获得空指针异常，而不需要获得相机许可，而不是iOS-12。

该权限将添加到代码集中。

codename1.arg.ios.NSPhotoLibraryAddUsageDescription=The App uses the Photo Library to save Images downloaded from News
codename1.arg.ios.NSCameraUsageDescription=The App uses the Camera for Video Chat support
codename1.arg.ios.NSPhotoLibraryUsageDescription=The App uses the Photo Library to save Images downloaded from News

在iOS11上有什么可以处理的问题吗？

-使用Xcode9.2从模拟器跟踪异常堆栈

2018-10-04 18:47:50.830359+0300 TestApplication[7630:35311] *** Assertion failure in -[UIApplication _cachedSystemAnimationFenceCreatingIfNecessary:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3698.33.6/UIApplication.m:1709
2018-10-04 18:47:50.853277+0300 TestApplication[7630:35311] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'accessing _cachedSystemAnimationFence requires the main thread'
*** First throw call stack:
(
    0   CoreFoundation                      0x000000010da7312b __exceptionPreprocess + 171
    1   libobjc.A.dylib                     0x000000010d107f41 objc_exception_throw + 48
    2   CoreFoundation                      0x000000010da782f2 +[NSException raise:format:arguments:] + 98
    3   Foundation                          0x0000000109d38d69 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 193
    4   UIKit                               0x0000000107ac692d -[UIApplication _cachedSystemAnimationFenceCreatingIfNecessary:] + 359
    5   UIKit                               0x0000000107b51ac9 +[UIWindow _synchronizeDrawingWithPreCommitHandler:] + 57
    6   UIKit                               0x00000001082cfb7b -[UIInputViewAnimationStyle launchAnimation:afterStarted:completion:forHost:fromCurrentPosition:] + 99
    7   UIKit                               0x000000010872be9a -[UIInputWindowController moveFromPlacement:toPlacement:starting:completion:] + 1697
    8   UIKit                               0x0000000108734c8f __43-[UIInputWindowController setInputViewSet:]_block_invoke.1493 + 97
    9   UIKit                               0x0000000108724208 -[UIInputWindowController performOperations:withTemplateNotificationInfo:] + 46
    10  UIKit                               0x000000010873481b -[UIInputWindowController setInputViewSet:] + 1336
    11  UIKit                               0x000000010872b450 -[UIInputWindowController performOperations:withAnimationStyle:] + 50
    12  UIKit                               0x00000001082c8164 -[UIPeripheralHost(UIKitInternal) setInputViews:animationStyle:] + 1669
    13  UIKit                               0x00000001082bff4b -[UIPeripheralHost(UIKitInternal) _reloadInputViewsForResponder:] + 2163
    14  UIKit                               0x00000001082c9480 -[UIPeripheralHost(UIKitInternal) _preserveInputViewsWithId:animated:reset:] + 498
    15  UIKit                               0x0000000107c89130 -[UIViewController _presentViewController:modalSourceViewController:presentationController:animationController:interactionController:completion:] + 1233
    16  UIKit                               0x0000000107c8ae94 -[UIViewController _presentViewController:withAnimationController:completion:] + 4621
    17  UIKit                               0x0000000107c8d9a9 __63-[UIViewController _presentViewController:animated:completion:]_block_invoke + 99
    18  UIKit                               0x0000000107c8e079 -[UIViewController _performCoordinatedPresentOrDismiss:animated:] + 532
    19  UIKit                               0x0000000107c8d908 -[UIViewController _presentViewController:animated:completion:] + 181
    20  UIKit                               0x0000000107c8dc67 -[UIViewController presentViewController:animated:completion:] + 159

感谢你的帮助

致以敬意，

Answer 1

谢谢您的帮助，问题只出现在iOS11上，如果我给出任何带有动画的视图控制器，原因是:是的，我通过添加以下代码更改了如何调用视图控制器

dispatch_queue_t _serialQueue = dispatch_queue_create("x.y.z", DISPATCH_QUEUE_CONCURRENT);
dispatch_sync(_serialQueue, ^{
        self.filePath=param;
        [self showForm];

    });

showForm :只需获取旧视图控制器的副本，并呈现新的视图控制器，就像用于等待摄像机完成挑选并保存到图库中的文件那样：

-(void)showForm{
    condition = [[NSCondition alloc] init];
    self.parentViewController = [[[[UIApplication sharedApplication] delegate] window] rootViewController];
    [self.parentViewController.view setUserInteractionEnabled:NO];
    destinationViewController = [[ViewController alloc] initWithValues:self.filePath andCondition:condition andChoice:@"Camera"];
    [[[[[UIApplication sharedApplication] delegate] window] rootViewController] presentViewController:destinationViewController animated:NO completion:nil];
    [condition lock];
    [condition wait];    
    self.filePath = [(ViewController*)destinationViewController getImagePath];
    [self.parentViewController.view setUserInteractionEnabled:YES];
    [condition unlock];



}

我希望这能帮助任何需要它的人

致以敬意，