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我有一个 iPad 应用程序，它应该只使用设备上的前置摄像头，

问题是我用前置摄像头拍摄第一张照片后，如果用户选择重拍照片，则使用后置摄像头，如果再次重拍则使用正确的前置摄像头，

每次点击拍摄照片时，我都会释放 imagePicker，然后弹出显示我的相机预览和图像的弹出窗口。

- (void)setUpImagePicker
{
    //poner photo picker en pop up!
    BOOL hasCamera = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];

    picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.sourceType = hasCamera ? UIImagePickerControllerSourceTypeCamera :    UIImagePickerControllerSourceTypePhotoLibrary; 
    picker.cameraDevice = UIImagePickerControllerCameraDeviceFront; 
    [picker setShowsCameraControls:FALSE];
    CGAffineTransform translate = CGAffineTransformMakeTranslation(0.0, 0.0);
    picker.cameraViewTransform = translate;
    CGAffineTransform scale = CGAffineTransformScale(translate, 1, 1);
    picker.cameraViewTransform = scale;

    self.companyPopOverController = [[[UIPopoverController alloc] initWithContentViewController:picker] autorelease];
    self.companyPopOverController.passthroughViews=[NSArray arrayWithObject:self.view]; 
    [self createTimer];
}
- (NSTimer*)createTimer {

    // create timer on run loop
    return [NSTimer scheduledTimerWithTimeInterval:0.3 target:self selector:@selector(timerTicked:) userInfo:nil repeats:NO];
}

- (void)timerTicked:(NSTimer*)timer {

    [self.companyPopOverController presentPopoverFromRect:CGRectMake(622, 534, 10, 10) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionDown animated:YES];
}
- (void)takePicButtonPressed:(id)sender
{
    NSLog(@"takePicButtonPressed");

    if (!self.retakePic) {
        NSLog(@"retake no");
        self.retakePic = YES;
        self.imageTaken = YES;

        [self.takePicButton setImage:[UIImage imageNamed:@"takePicButton_Re"] forState:UIControlStateNormal];
        [picker takePicture];

        return;
    }else {
        NSLog(@"retake is yes");
        self.retakePic = NO;
        self.imageTaken = NO;

        picker = nil;
        [picker release];
        self.companyPopOverController = nil;
        [self.companyPopOverController release];
          [self setUpImagePicker];

        //button image, take
        [self.takePicButton setImage:[UIImage imageNamed:@"takePicButton"] forState:UIControlStateNormal];

        return;
    }

}

那么如何确保我的应用只使用前置摄像头呢？

谢谢！

4

1 回答 1

3

这是一种解决方法，但是因为没有代表您正在寻找的东西，所以这将起到作用。

在 ViewDidLoad 中从 PickerController 注册通知（在这种情况下，因为您实现了自己的控件，您可能必须设置自己的通知）

   [[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(retakeImage:)
                                             name:@"_UIImagePickerControllerUserDidRejectItem" object:nil];

然后，当用户选择重新拍摄照片时，重新断言选择器以使用前置摄像头。

  - (void)retakeImage:(NSNotification *)notification
  {
      self.pickerController.cameraDevice = UIImagePickerControllerCameraDeviceFront;
  }

希望这可以帮助！

于 2013-09-11T20:54:41.500 回答