Question

我在Main.storyboard中创建了一个UIViewController，我试图从UIImagePickerController委托方法中以编程方式呈现它。但我收到的消息是：

Warning: Attempt to present <DAAnalysisViewController: 0x8b99960> on 
<DAViewController: 0x8b35300> whose view is not in the window hierarchy!

代码：

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

    DAAnalysisViewController *asdf = [[UIStoryboard storyboardWithName:@"Main" bundle:nil] 
   instantiateViewControllerWithIdentifier:@"1"];

    [self presentViewController:asdf animated:YES completion:nil];
}

如何从故事板中正确呈现UIViewController？

Answer 1

如果您的图像选择器以模态方式呈现，您可能需要先将其关闭，然后才能显示自定义视图控制器。像这样：

- (void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [self dismissViewControllerAnimated:YES completion:^{
        UIStoryboard *sb = [UIStoryboard storyboardWithName:@"Main" bundle:nil];

        DAAnalysisViewController *asdf = [sb instantiateViewControllerWithIdentifier:@"1"];

        [self presentViewController:asdf animated:YES completion:nil];
    }];
}

UIViewController没有从故事板中呈现

1 个答案: