ios - 使用 UIImagePickerController 拍摄两次照片

Question

在我的应用程序中，我使用 UIImagePickerController 拍照，当拍照时，应用程序会显示另一个 View Controller ，我在其中为用户提供了在他的照片中添加农场的可能性。在这个 View Controller 中，我将给用户重拍照片的机会，所以我创建了一个按钮来调用 UIImagePickerController，我使用了以下代码:

- (IBAction)buttonRetakePic:(UIBarButtonItem *)sender {
    UIImagePickerController *picker = [[UIImagePickerController alloc]init];
    picker.delegate = self;
    picker.sourceType = UIImagePickerControllerSourceTypeCamera;
    picker.cameraDevice = UIImagePickerControllerCameraDeviceFront;
    [self presentViewController:picker animated:YES completion:nil];
}

#pragma mark imagePicker delegate
- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    NSError *error;

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *imagePath = [documentsDirectory stringByAppendingPathComponent:@"/Immagini"];

    if (![[NSFileManager defaultManager] fileExistsAtPath:imagePath]) {
        [[NSFileManager defaultManager] createDirectoryAtPath:imagePath withIntermediateDirectories:NO attributes:nil error:&error];
    }

    NSArray *fileList = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:imagePath error:nil];
    long count = [fileList count];
    NSString *filename = [NSString stringWithFormat:@"Nivea_%ld.jpg", count++];
    NSString *imagePathWithFileName = [imagePath stringByAppendingPathComponent:filename];
    [[NSUserDefaults standardUserDefaults]setObject:filename forKey:@"Filename"];
    [[NSUserDefaults standardUserDefaults] synchronize];

    UIImage *picture = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
    NSData *thumbData = UIImageJPEGRepresentation(picture, 1);
    [thumbData writeToFile:imagePathWithFileName atomically:YES];

    UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UIViewController *vc = [storyBoard instantiateViewControllerWithIdentifier:@"Picture"];
    [[[[UIApplication sharedApplication] delegate] window] setRootViewController:vc];
}

但是当我按下 buttonBack 时，它会向我显示带有旧图片的 UIImagePickerController，我可以在看不到相机上发生了什么的情况下拍照。为什么它不起作用？怎么了？还有别的办法重拍吗？谢谢

Answer 1

首先关闭之前呈现的 imagePickerController。然后在完成时尝试呈现新的 imagePickerController。