UIImagePickerController摄像头类型返回黑色图像

Question

我正在努力使用UIImagePickerController，因为当我打开相机并拍摄图像时它在IOS 7中显示黑屏，因为这在ios 6中工作正常，我尝试了一些其他链接说什么但它不起作用，请帮我这个......

我也得到了这个错误

<Error>: CGAffineTransformInvert: singular matrix.

现在我得到了一些东西......

Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.

当我点击拍摄图像按钮时

 - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
    {
        dispatch_async(dispatch_get_main_queue(), ^{
            if (buttonIndex == 0) {

                if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0) {

                    NSString *mediaType = AVMediaTypeVideo; // Or AVMediaTypeAudio



                AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType];

                // This status is normally not visible—the AVCaptureDevice class methods for discovering devices do not return devices the user is restricted from accessing.
                if(authStatus == AVAuthorizationStatusRestricted){
                    NSLog(@"Restricted");
                }

                // The user has explicitly denied permission for media capture.
                else if(authStatus == AVAuthorizationStatusDenied){
                    NSLog(@"Denied");
                }

                // The user has explicitly granted permission for media capture, or explicit user permission is not necessary for the media type in question.
                else if(authStatus == AVAuthorizationStatusAuthorized){
                    NSLog(@"Authorized");

                    if  ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
                        UIImagePickerController *imagePickerCamera =[[UIImagePickerController alloc] init];
                        imagePickerCamera.delegate = self;
                        imagePickerCamera.allowsEditing = YES;
                        imagePickerCamera.sourceType = UIImagePickerControllerSourceTypeCamera;
                        dispatch_async(dispatch_get_main_queue(), ^{
                            [self presentViewController:imagePickerCamera  animated:YES completion:^{}];
                        });

                    } else {

                        NSString *errorString = [NSString stringWithFormat:@"This device does not support this feature."];
                        UIAlertView * errorAlert = [[UIAlertView alloc] initWithTitle:@"Alert" message:errorString delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
                        [errorAlert show];
                    }
                }

                // Explicit user permission is required for media capture, but the user has not yet granted or denied such permission.
                else if(authStatus == AVAuthorizationStatusNotDetermined){

                    [AVCaptureDevice requestAccessForMediaType:mediaType completionHandler:^(BOOL granted) {
                        if(granted){
                            NSLog(@"Granted access to %@", mediaType);
                        }
                        else {
                            NSLog(@"Not granted access to %@", mediaType);
                        }
                    }];

                }

                else {
                    NSLog(@"Unknown authorization status");
                }
            }

            else {
                if  ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
                    dispatch_async(dispatch_get_main_queue(), ^{
                        UIImagePickerController *imagePickerCamera =[[UIImagePickerController alloc] init];
                    imagePickerCamera.delegate = self;
                    imagePickerCamera.mediaTypes = @[(NSString *) kUTTypeImage];
                    imagePickerCamera.allowsEditing = YES;
                    imagePickerCamera.sourceType = UIImagePickerControllerSourceTypeCamera;
                        [self presentViewController:imagePickerCamera  animated:YES completion:nil];
                    });
                } else {

                    NSString *errorString = [NSString stringWithFormat:@"This device does not support this feature."];
                    UIAlertView * errorAlert = [[UIAlertView alloc] initWithTitle:@"Alert" message:errorString delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
                    [errorAlert show];
                }
            }


        } else if (buttonIndex == 1) {


            if  ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
                UIImagePickerController *imagePickerAlbum =[[UIImagePickerController alloc] init];
                imagePickerAlbum.delegate = self;
                imagePickerAlbum.mediaTypes = @[(NSString *) kUTTypeImage];
                imagePickerAlbum.allowsEditing = YES;
                imagePickerAlbum.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

                [self presentViewController:imagePickerAlbum animated:YES completion:nil];
            } else {

                NSString *errorString = [NSString stringWithFormat:@"This device does not support this feature."];
                UIAlertView * errorAlert = [[UIAlertView alloc] initWithTitle:@"Alert" message:errorString delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
                [errorAlert show];
            }
        }
    });
}


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

[picker dismissModalViewControllerAnimated:YES];
_upLoadimage = info[UIImagePickerControllerEditedImage];

}

Answer 1

我的相机遇到了同样的问题。我修改或编辑相机图像的屏幕显示为黑色。日志显示我同样的错误（CGAffineTransformInvert xx）。我做了很多检查以确定或知道错误在哪里。

在我的应用程序中，我使用组件SVProgessHUD来显示警报和消息。使用此用法注释行可以解决问题。我已更新到组件的最后一个版本（1.0），错误CGAffineTransformInvert消失。