在iOS应用中录制视频而无需离开应用

Question

PhoneGap提供了一个用于录制视频的插件，但this plug-in似乎迫使用户离开相机应用的应用以录制视频。

是否可以在不离开应用程序的情况下启动和停止视频录制？

以下两种方法是我们使用的主要方法（可从上面的链接查看其余插件）来捕获视频。当用户点击按钮时，我们应该如何修改它以允许从前置摄像头录制而不离开应用程序？

有人可以提供指导吗？感谢。

Capture.m：

- (void)captureVideo:(CDVInvokedUrlCommand*)command
{
    NSString* callbackId = command.callbackId;
    NSDictionary* options = [command.arguments objectAtIndex:0];

    if ([options isKindOfClass:[NSNull class]]) {
        options = [NSDictionary dictionary];
    }

    // options could contain limit, duration and mode
    // taking more than one video (limit) is only supported if provide own controls via cameraOverlayView property
    NSNumber* duration = [options objectForKey:@"duration"];
    NSString* mediaType = nil;

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        // there is a camera, it is available, make sure it can do movies
        pickerController = [[CDVImagePicker alloc] init];

        NSArray* types = nil;
        if ([UIImagePickerController respondsToSelector:@selector(availableMediaTypesForSourceType:)]) {
            types = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];
            // NSLog(@"MediaTypes: %@", [types description]);

            if ([types containsObject:(NSString*)kUTTypeMovie]) {
                mediaType = (NSString*)kUTTypeMovie;
            } else if ([types containsObject:(NSString*)kUTTypeVideo]) {
                mediaType = (NSString*)kUTTypeVideo;
            }
        }
    }
    if (!mediaType) {
        // don't have video camera return error
        NSLog(@"Capture.captureVideo: video mode not available.");
        CDVPluginResult* result = [CDVPluginResult resultWithStatus:CDVCommandStatus_ERROR messageToErrorObject:CAPTURE_NOT_SUPPORTED];
        [self.commandDelegate sendPluginResult:result callbackId:callbackId];
        pickerController = nil;
    } else {
        pickerController.delegate = self;
        pickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
        pickerController.allowsEditing = NO;
        // iOS 3.0
        pickerController.mediaTypes = [NSArray arrayWithObjects:mediaType, nil];

        if ([mediaType isEqualToString:(NSString*)kUTTypeMovie]){
            if (duration) {
                pickerController.videoMaximumDuration = [duration doubleValue];
            }
            //NSLog(@"pickerController.videoMaximumDuration = %f", pickerController.videoMaximumDuration);
        }

        // iOS 4.0
        if ([pickerController respondsToSelector:@selector(cameraCaptureMode)]) {
            pickerController.cameraCaptureMode = UIImagePickerControllerCameraCaptureModeVideo;
            // pickerController.videoQuality = UIImagePickerControllerQualityTypeHigh;
            // pickerController.cameraDevice = UIImagePickerControllerCameraDeviceRear;
            // pickerController.cameraFlashMode = UIImagePickerControllerCameraFlashModeAuto;
        }
        // CDVImagePicker specific property
        pickerController.callbackId = callbackId;

        SEL selector = NSSelectorFromString(@"presentViewController:animated:completion:");
        if ([self.viewController respondsToSelector:selector]) {
            [self.viewController presentViewController:pickerController animated:YES completion:nil];
        } else {
            // deprecated as of iOS >= 6.0
            [self.viewController presentModalViewController:pickerController animated:YES];
        }
    }
}

- (CDVPluginResult*)processVideo:(NSString*)moviePath forCallbackId:(NSString*)callbackId
{
    // save the movie to photo album (only avail as of iOS 3.1)

    /* don't need, it should automatically get saved
     NSLog(@"can save %@: %d ?", moviePath, UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(moviePath));
    if (&UIVideoAtPathIsCompatibleWithSavedPhotosAlbum != NULL && UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(moviePath) == YES) {
        NSLog(@"try to save movie");
        UISaveVideoAtPathToSavedPhotosAlbum(moviePath, nil, nil, nil);
        NSLog(@"finished saving movie");
    }*/
    // create MediaFile object
    NSDictionary* fileDict = [self getMediaDictionaryFromPath:moviePath ofType:nil];
    NSArray* fileArray = [NSArray arrayWithObject:fileDict];

    return [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsArray:fileArray];
}