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iOS - 使用StoryBoard创建Popover视图(iOS - Create an Popover View using StoryBoard)

 大家好，现在我正在尝试使用Xcode故事板创建一个Pop-OverView。 首先，我有  
rootViewController, UIViewController, and UITableViewController
 
 我希望UIView充当页面翻转，UITableView将在navigationBar项目控制器下显示popOver。  
 对于UITableView，我想在NavigationBar控制器下制作Pop-Over。 问题是，当我触摸导航项目以显示UITableViewController时，它显示正确，但是当我尝试关闭Pop-Over View时，它不会关闭。 然后，导航项不能很好地工作。 当我多次触摸它时，它会显示popOverView的多个实例。  
 这对我来说似乎没有意义。 任何人都可以帮我或告诉我在哪里可以找到关于此的文档/教程？  
 更新： 
 
 对于UIPopOverController，它现在似乎运行良好，但是当我多次触摸导航项时，它仍然在困扰我。 它将显示PopOver的多个实例。 我该如何处理它，它只显示一个实例？ 

Hi there, Now I'm trying to create a Pop-OverView using an Xcode storyboard. Firstly, I have  
rootViewController, UIViewController, and UITableViewController
 
I want the UIView to act as a page flip and the UITableView will show popOver under the navigationBar item controller. 
For the UITableView, I want to make a Pop-Over under NavigationBar controller. The problem is, when I touch the Navigation item to show the UITableViewController, it shows correctly, but when I try to close the Pop-Over View, it won't close. And then, the navigation item doesn't work well. It shows multiple instances of popOverView when I touch it multiple times. 
This doesn't seem to make sense to me. Can anyone help me out or tell me where to find documentation / tutorials on this? 
UPDATE:
 
For the UIPopOverController, it seems to work well now, but it is still bugging me when I touch a Navigation Item multiple times. It will show multiple instances of PopOver. How can I handle it, so it will show only one instance?

原文：https://stackoverflow.com/questions/8225589

更新时间：2023-06-28 12:06

最满意答案

 您没有在IdFTP.Get调用后重置内存流。 这意味着LoadFromStream调用接收0字节，因此＃42错误：  
var
  ms1 : TMemoryStream;
  J : TJPEGImage;
  St : String;
begin
  try
    ms1 := TMemoryStream.Create;
    try
      St := 'somepath';
      IdFTP1.Get(St, ms1);
      if ms1.Size > 0 then
      begin
        ms1.Position := 0; // <-- add this
        J := TJPEGImage.Create;
        try
          J.LoadFromStream(ms1);
          Image4.Picture.Graphic := J;
        finally
          J.Free;
        end;
      end;
    finally
      ms1.Free;
    end;
  except
    on E: Exception do
      ShowMessage(E.Message);
  end;
end;

You are not resetting the memory stream after the IdFTP.Get call. This means that the LoadFromStream call receives 0 bytes and hence the #42 error: 
var
  ms1 : TMemoryStream;
  J : TJPEGImage;
  St : String;
begin
  try
    ms1 := TMemoryStream.Create;
    try
      St := 'somepath';
      IdFTP1.Get(St, ms1);
      if ms1.Size > 0 then
      begin
        ms1.Position := 0; // <-- add this
        J := TJPEGImage.Create;
        try
          J.LoadFromStream(ms1);
          Image4.Picture.Graphic := J;
        finally
          J.Free;
        end;
      end;
    finally
      ms1.Free;
    end;
  except
    on E: Exception do
      ShowMessage(E.Message);
  end;
end;

iOS - 使用StoryBoard创建Popover视图(iOS - Create an Popover View using StoryBoard)

最满意答案

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