UIViewController沒有從故事板中呈現

Question

我在Main.storyboard中創建了一個UIViewController，我試圖從UIImagePickerController委托方法中以編程方式呈現它。 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!

碼：

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

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

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

如何從故事板中正確呈現UIViewController？

Answer 1

如果您的圖像選擇器以模態方式呈現，您可能需要先將其關閉，然后才能顯示自定義視圖控制器。 像這樣的東西：

- (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];
    }];
}