Question

我有一个基于UIImagePickerController的摄像头控制器：

@interface CameraController : UIImagePickerController
    <UIImagePickerControllerDelegate>
    // <UIImagePickerControllerDelegate, UINavigationControllerDelegate>
{
}

@end

Init生成警告UINavigationControllerDelegate未实现（由于我不希望我的对象成为该委托，因此预期会出现）：

- (id) init
{
    if(!(self = [super init]))
        return nil;

    super.sourceType =  UIImagePickerControllerSourceTypeCamera;
    // Commenting delegat does not help
    super.delegate = self;

    return self;
}

尽管是UIImagePickerControllerDelegate代理，imagePickerController:didFinishPickingMediaWithInfo: 未被调用。我还验证了其他两个委托方法也没有被调用。

如果我确实声称遵守UINavigationControllerDelegate，则imagePickerController:didFinishPickingMediaWith 被调用，但我在dismissModalViewControllerAnimated时崩溃：

- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    ASSERT_VALID(picker);
    ASSERT_VALID(info);

    // Commenting does not help
    [picker autorelease];

    UIImage* image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];   
    ASSERT_VALID(image);

    // Image processing commented out

    // super.delegate = nil;
    // picker.delegate = nil;

    // [self dismissModalViewControllerAnimated:YES];
    // [super dismissModalViewControllerAnimated:YES];
    // [self performSelector:@selector(dismissModalViewControllerAnimated:) withObject:nil afterDelay:0.0f];
    // [self dismissModalViewControllerAnimated:NO];
    // [super dismissModalViewControllerAnimated:NO];
    [self performSelector:@selector(dismissModalViewControllerAnimated:) withObject:nil afterDelay:0.5f];
}

我看过这个CURSED视图控制器上的一些帖子。最接近的UIImagePickerControllerDelegate not responding properly和iPhone - UIImagePickerControllerDelegate inheritance没有帮助。

这次可能有什么想法？立即浮现两个问题：（1）UINavigationControllerDelegate与图像调用我的回调有什么关系，以及（2）为什么这个对象不能正确地清理自己？

提前致谢，

Answer 1

UIImagePickerController类不应该是子类。参考手册说：

本课程旨在使用原样，不支持子类。

没有理由。只需创建UIViewController的子类并实现委托。

我已多次成功使用它。我一直声明我的视图控制器实现UINavigationControllerDelegate但没有实现此协议的任何方法。

iPhone：UIImagePickerControllerDelegate方法没有被调用？

1 个答案: