缺少UIImagePickerControllerReferenceURL

Question

我正在尝试获取有关我选择的视频的一些数据UIImagePicker.

因此当它进入UIImagePicker委托方法(下面)时,我理解我需要使用UIImagePickerControllerReferenceURL信息字典中的密钥.

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    NSURL *url = [info objectForKey:UIImagePickerControllerReferenceURL];

    NSLog(@"%@",url);

    [library addAssetURL:[info objectForKey:UIImagePickerControllerReferenceURL] toAlbum:@"Compedia" withCompletionBlock:^(NSError *error) {
        if (error!=nil) {
            NSLog(@"Big error: %@", [error description]);
        }
    }];
}

问题是网址是零.我打印了信息的描述,它看起来像这样:

Printing description of info:
{
    UIImagePickerControllerMediaType = "public.movie";
    UIImagePickerControllerMediaURL = "file://localhost/private/var/mobile/Applications/6630FBD3-1212-4ED0-BC3B-0C23AEEFB267/tmp/capture-T0x1f57e880.tmp.Ulfn5o/capturedvideo.MOV";
}

在我完成一些研究后,我发现如果我设置相机,kUTTypeMovie它应该给我媒体和参考网址.

这就是我定义相机的方式:

cameraUI = [[UIImagePickerController alloc] init];
cameraUI.sourceType = UIImagePickerControllerSourceTypeCamera;
cameraUI.mediaTypes = [[NSArray alloc] initWithObjects:(NSString *)kUTTypeMovie, nil];
cameraUI.allowsEditing = YES;
cameraUI.delegate = delegate;
cameraUI.showsCameraControls = NO;
cameraUI.cameraOverlayView = [self getCustomToolBar];

有什么我想念的吗？

谢谢,

Answer 1

这个几乎疯了.每一个我看过的地方似乎都相信每个人都在UIImagePickerControllerReferenceURL那里.

无论如何,问题是如果你使用相机拍摄照片之后调用你的代表,那么UIImagePickerControllerReferenceURL因为图像还没有保存到相机胶卷,所以没有UIImagePickerControllerReferenceURL.只有在从相机胶卷中选择图像后调用代表时才会出现.

所以我的方法是使用ALAssetLibrary将其保存到相机胶卷然后读回URL.

继承人我的解决方案:

首先,您要检测PickerControllersourceType以查看它是相机还是photosLibrary/ savedPhotosAlbum.如果它是相机,那么我们使用资产库的writeImageToSavedPhotosAlbum:orientation:completionBlock:将图像写入相机胶卷,并在完成块中返回图像URL.

但是,如果它不是摄像机,那么这意味着是两者photosLibrary或savedPhotosAlbum两者[info objectForKey:UIImagePickerControllerReferenceURL]都会返回一个有效的URL

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

//dismiss the imagepicker view
[self dismissViewControllerAnimated:YES completion:nil];


if( [picker sourceType] == UIImagePickerControllerSourceTypeCamera )
{
    UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
    ALAssetsLibrary *library = [Utils defaultAssetsLibrary];
    [library writeImageToSavedPhotosAlbum:image.CGImage orientation:(ALAssetOrientation)image.imageOrientation completionBlock:^(NSURL *assetURL, NSError *error )
     {
         //here is your URL : assetURL
     }];
}
else
{
    //else this is valid : [info objectForKey:UIImagePickerControllerReferenceURL]];
}

}

希望有所帮助.