Question

我已经设置了一个动作表，它可以在拍照时返回3个选项（拍照，从画廊中选择并取消），前置摄像头出现并完美拍摄照片，但问题是当我再拍一张照片时，它不向我展示面对相机的frotn，它向我展示了后置摄像头。这是代码：

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{   
    CustomImagePickerController *imagePicker = [[CustomImagePickerController alloc] init];
    [imagePicker setDelegate:self];
    [imagePicker setAllowsEditing:YES];

    if(buttonIndex == 0) {
        [imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
        [imagePicker setCameraDevice:UIImagePickerControllerCameraDeviceFront];
    } else if(buttonIndex == 1) {
        [imagePicker setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
    }

我在代码中有更多内容，但主要操作设置在那里。

有什么不对吗？感谢

Answer 1

可能发生这种情况的原因是，当您第一次启动相机时，后台中的AVCaptureSession可能会在解除控制器后继续运行。因此，当你下次出现它时，它试图添加前置摄像头但它很忙，所以它转到下一个可用（后置摄像头），自动中断（从而释放前一个）等等。如果您使用的是ARC，那么最好使用imagePicker作为您正在使用它的类的属性。

或每次检查相机设备

if(buttonIndex == 0)
    {
        if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
        {
            imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
            [imagePicker setCameraDevice:UIImagePickerControllerCameraDeviceFront];
        }

    }

Answer 2

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
    CustomImagePickerController *imagePicker = [[CustomImagePickerController alloc] init];
[imagePicker setDelegate:self];
[imagePicker setAllowsEditing:YES];

    if(buttonIndex == 0)
    {
        if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
        {
            imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
            [imagePicker setCameraDevice:UIImagePickerControllerCameraDeviceFront];
        }
        else
        {
            imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
            [imagePicker setCameraDevice:UIImagePickerControllerCameraDeviceFront];
        }

         [self presentViewController:imagePicker animated:YES completion:nil ];

    }
    else if (buttonIndex==1)
    {
        imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
        [self presentViewController:imagePicker animated:YES completion:nil ];

    }
}

前置摄像头上的操作表没有响应

2 个答案: