UIImagePickerController allowedEditing=YES 仅适用于视频

Question

我正在使用UIImagePickerController 让用户选择照片或视频。我面临的问题是，我使用自己的图像编辑器来处理照片，所以想要 allowsEditing=NO 来处理照片，但是视频必须有一定的长度，所以我想要 allowsEditing=YES 来处理视频。

为图像选择器设置videoMaximumDuration 可以在录制视频时正常工作，但如果从相机胶卷中选择，它只会在启用allowsEditing 时通知用户视频太长。

到目前为止，我可以在使用相机时通过监听ImageControlModeChanged 通知成功更改allowsEditing 属性。然后我可以使用以下方法更改属性：

- (void)imageCaptured:(NSNotification *)notification
{
    if (imagePicker.cameraCaptureMode == UIImagePickerControllerCameraCaptureModeVideo) {
        imagePicker.allowsEditing = YES;
    } else {
        imagePicker.allowsEditing = NO;
    }
}

但是，当从相机胶卷中选择时，这不起作用。我已经监控了通知，但看不到一个对更改 allowsEditing 属性有用的通知，具体取决于所选项目。

这可能吗？

谢谢

Answer 1

为什么不创建 2 个甚至 4 个 UIImagePickerControllers 而不是乱搞通知？

- (void) useCamera
{
    if ([UIImagePickerController isSourceTypeAvailable:
         UIImagePickerControllerSourceTypeCamera])
    {
        UIImagePickerController *imagePicker =
        [[UIImagePickerController alloc] init];
        imagePicker.delegate = self;
        imagePicker.sourceType =
        UIImagePickerControllerSourceTypeCamera;
        imagePicker.mediaTypes = [NSArray arrayWithObjects:
                                  (NSString *) kUTTypeImage,
                                  nil];
        imagePicker.allowsEditing = NO;
        [self presentViewController:imagePicker animated:YES completion:nil];
    }
}

- (void) useCameraRoll
{
    if ([UIImagePickerController isSourceTypeAvailable:
         UIImagePickerControllerSourceTypeSavedPhotosAlbum])
    {
        UIImagePickerController *imagePicker =
        [[UIImagePickerController alloc] init];
        imagePicker.delegate = self;
        imagePicker.sourceType =
        UIImagePickerControllerSourceTypePhotoLibrary;
        imagePicker.mediaTypes = [NSArray arrayWithObjects:(NSString *) kUTTypeImage,nil];
        imagePicker.allowsEditing = NO;
        [self presentViewController:imagePicker animated:YES completion:nil];
    }
}

- (void)videoRoll
{

    if ([UIImagePickerController isSourceTypeAvailable:
         UIImagePickerControllerSourceTypeSavedPhotosAlbum])
    {
        UIImagePickerController *imagePicker =
        [[UIImagePickerController alloc] init];
        imagePicker.delegate = self;
        imagePicker.sourceType =
        UIImagePickerControllerSourceTypePhotoLibrary;
        imagePicker.mediaTypes = [NSArray arrayWithObjects:
                                  (NSString *) kUTTypeImage,
                                  nil];
        imagePicker.allowsEditing = YES;
        imagePicker.mediaTypes = [NSArray arrayWithObject:(NSString *)kUTTypeMovie];
        [self presentViewController:imagePicker animated:YES completion:nil];
    }
}

- (void)vidCam
{
    if ([UIImagePickerController isSourceTypeAvailable:
         UIImagePickerControllerSourceTypeSavedPhotosAlbum])
    {
        UIImagePickerController *imagePicker =
        [[UIImagePickerController alloc] init];
        imagePicker.delegate = self;
        imagePicker.sourceType =
        UIImagePickerControllerSourceTypeCamera;
        imagePicker.mediaTypes = [NSArray arrayWithObjects:
                                  (NSString *) kUTTypeImage,
                                  nil];
        imagePicker.allowsEditing = NO;
        imagePicker.mediaTypes = [NSArray arrayWithObject:(NSString *)kUTTypeMovie];
        [self presentViewController:imagePicker animated:YES completion:nil];
    }
}

编辑：

在更好地理解了这个问题之后，我认为这是不可能的。您可以使用一些通知，但这些通知没有记录在任何地方，也没有在 iOS7 上运行。如果真的是这样，我能想到的最好的解决方案是使用 github.com/andrei200287/SAVideoRangeSlider 和 allowsEditing = NO 之类的第 3 方。

Answer 2

试试这个 在视图中分配属性确实加载了，而不是在 imageCaptured 方法中。它工作正常

 videoController.delegate = self;
    videoController.sourceType =UIImagePickerControllerSourceTypePhotoLibrary;
    videoController.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:videoController.sourceType];
    videoController.allowsEditing = YES;