在delphi firemonkey移动应用程序（Android）中关闭模态对话框

问题描述

我正在尝试找出为什么我的模态形式不会关闭的最疯狂的时刻？
使用Delphi XE-5和FireMonkey Mobile App（Android），我遵循信息为了演示目的，我创建了一个新的Firemonkey Mobile delphi应用程序，并添加了一个辅助firemonkey手机表单。

从主窗体，我使用文章中的代码：

  procedure TForm1.Button1Click（Sender：TObject）; 
 var 
 Form2：TForm2; 
 begin 
 Form2：= TForm2.Create（nil）; 
 
 Form2.ShowModal（procedure（ModalResult：TModalResult）
 begin 
如果ModalResult = mrOK然后
 begin 
 // 
 end; 
 Form2.DisposeOf; 
 end）; 
 
 end; 
  

在辅助窗体上，我将Ok和Cancel按钮的modalresult属性分配给mrCancel 和mrOK。但是，当显示模态对话框时，两个按钮都不会使对话框关闭。我甚至尝试添加onClick事件并通过代码分配modalresult。为什么不关闭窗体？我想我需要确保我做了一切正确和可能的我的电话（设备）？

解决方案

为了关闭你的模式对话框，使用此模式：

  procedure TForm2.FormClose（Sender：TObject; var Action：TCloseAction）; 
 begin 
动作：= TCloseAction.caFree; 
结束
  

并删除您的呼叫 Form2.DisposeOf; ，因为 ModalResult setter需要对有效的对象进行操作。

文档已在XE7中更新，请参阅。

另请参见 Android上的ShowModal ，为什么 DisposeOf 是错误的。

I am having the dandiest time trying to figure out why my modal form will not close!Using Delphi XE-5 and FireMonkey Mobile App (Android), i followed the the info "ShowModal Dialogs in FireMonkey Mobile Apps"

for demo purposes, i created a new Firemonkey Mobile delphi application and added a secondary firemonkey mobile form. From the main form, i use the code from the article:

procedure TForm1.Button1Click(Sender: TObject);
var
  Form2: TForm2;
begin
  Form2 := TForm2.Create(nil);

  Form2.ShowModal(procedure(ModalResult: TModalResult)
    begin
      if ModalResult = mrOK then
      begin
        //
      end;
      Form2.DisposeOf;
    end);

end;

On the secondary form, i assign the "Ok" and "Cancel" buttons modalresult property to "mrCancel" and "mrOK", respectively. However, when the modal dialog is shown, neither button makes the dialog close. I even tried adding onClick events and assigning the modalresult by code. Why wont the form close? I guess I need assurance that I did everthing right and possible its my PHONE (device)?

解决方案

In order to close your modal dialog, use this pattern:

procedure TForm2.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  Action := TCloseAction.caFree;
end;

and remove your call Form2.DisposeOf;, since the ModalResult setter needs to operate on a valid object.

The documentation has been updated in XE7, see Using FireMonkey Modal Dialog Boxes.

See also ShowModal on Android for the details why DisposeOf is wrong.

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