UIImagePickerController allowEditing = YES僅用於視頻

Question

我正在使用UIImagePickerController讓用戶選擇照片或視頻。 我面臨的問題是，我使用自己的圖片編輯器拍攝照片，所以想要照片的編輯是否allowsEditing=NO編輯allowsEditing=NO ，但視頻必須是一定的長度所以我想要視頻的allowsEditing=YES 。

在錄制視頻時，為圖像選擇器設置videoMaximumDuration工作正常，但如果從相機膠卷中選擇，則僅在啟用了allowsEditing通知用戶視頻太長。

到目前為止，通過偵聽ImageControlModeChanged通知，我可以在使用攝像頭時成功更改allowsEditing屬性。 然后我可以使用以下方法更改屬性：

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

但是，從相機膠卷中選擇時，這不起作用。 我已經監視了通知，並且根據選擇的項目，無法看到有助於更改allowsEditing屬性的通知。

這甚至可能嗎？

謝謝

Answer 1

為什么不創建2甚至4個UIImagePickerController而不是搞亂通知呢？

- (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];
    }
}

編輯：

在更好地理解這個問題后，我認為這是不可能的。 您可以使用一些通知，但這些通知沒有在任何地方記錄或在iOS7上工作。 如果確實如此，我能想到的最好的解決方案是使用第三方，例如github.com/andrei200287/SAVideoRangeSlider和allowsEditing = NO 。

Answer 2

在view do load中嘗試此賦值屬性，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;