前置攝像頭上的操作表無響應

Question

我已經設置了一個操作表，可以在拍照時返回3個選項（拍照，從畫廊中選擇並取消），前置攝像頭出現並完美地拍照，但是問題是當我再次拍照時，它沒有告訴我那張破舊的照相機，它告訴我背面的照相機。 這是代碼：

- (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];
    }

我在代碼中還有更多內容，但主要操作已在此處設置。

有什么事嗎 謝謝

Answer 1

發生這種情況的原因是，當您第一次啟動攝像機時，在關閉控制器后，后台的AVCaptureSession可能會繼續運行。 因此，下次您展示它時，它嘗試添加前置攝像頭，但它很忙，因此轉到下一個可用攝像頭（后置攝像頭），中斷了自身（因此釋放了前一個），依此類推。 如果使用的是ARC，則最好將imagePicker用作使用它的類的屬性。

或每次檢查相機設備

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 ];

    }
}