iOS Question Calling routine in Page that has not been shown needs delay?

Robert Valentino · Apr 25, 2022

NOTE: My page is created using:

B4X:

            B4XPages.AddPageAndCreate(cBBsGlobals.DEFINE_PageName_UserPreferences,     mUserPreferences)

In B4A I do the following routine

B4X:

#Region Preferences_Click
Private Sub sReports_Options_Preferences_Click
            Dim Preferences As pUserPreferences = B4XPages.GetPage(cBBsGlobals.DEFINE_PageName_UserPreferences)
           
            If  Preferences.IsInitialized Then   
                B4XPages.ShowPage(cBBsGlobals.DEFINE_PageName_UserPreferences)
               
#if B4i               
                Sleep(125)
#end if               
               
                Preferences.Show_Preferences("PDF Print")                           
            End If
End Sub
#end Region

In B4i I needed to add a delay otherwise I crash (don't need delay in B4A)

I tried doing

B4X:

CallSubDelayed2(Preferences, "Show_Preferences", "PDF Print")

But without the Sleep delay still crashed.

Is the delay a B4I requirement?

LucaMs · Apr 25, 2022

I don't have B4I but...

- I don't think you don't have to do anything special in B4I with B4XPages than you do in B4A
- CallSubDelayed requires TWO parameters, not THREE (the component and the name of the sub)
- Declare your pages in B4XMainPage As public, so you don't need this stuff:

Robert Valentino said:
Dim Preferences As pUserPreferences = B4XPages.GetPage(cBBsGlobals.DEFINE_PageName_UserPreferences)
If Preferences.IsInitialized Then

Robert Valentino · Apr 25, 2022

LucaMs said:
I don't have B4I but...

- I don't think you don't have to do anything special in B4I with B4XPages than you do in B4A
- CallSubDelayed requires TWO parameters, not THREE (the component and the name of the sub)
- Declare your pages in B4XMainPage As public, so you don't need this stuff:

Sorry type-O on the CallSubDelayed (typed that online)

I've tried it different ways. If I've been to the page before it doesn't need the delay, but if I haven't and call it from another page (maybe the setup takes a while)

Just looked they are declared as public (will make the changes to call directly)

LucaMs · Apr 25, 2022

Robert Valentino said:
Sorry type-O on the CallSubDelayed (typed that online)

I've tried it different ways. If I've been to the page before it doesn't need the delay, but if I haven't and call it from another page (maybe the setup takes a while)

Just looked they are declared as public (will make the changes to call directly)

Maybe the creation (B4XPage_Created) takes some time (but with both b4a and b4i).

LucaMs · Apr 25, 2022

Robert Valentino said:
Just looked they are declared as public (will make the changes to call directly)

You can still call the methods indirectly (but also directly, of course) but you can write:

B4X:

CallSubDelayed(B4XPages.MainPage.mUserPreferences, "Show_Preferences")

rather than:

B4X:

Dim Preferences As pUserPreferences = B4XPages.GetPage(cBBsGlobals.DEFINE_PageName_UserPreferences)
CallSubDelayed2(Preferences, "Show_Preferences")

You could also create a "short" and specific code module, "enPages", like:

enPages - code module:

Public Const UserPref As String = "UserPreferences"
Public Const PageTwo As String = "PageTwo"
'...

instead of:
cBBsGlobals.DEFINE_PageName_UserPreferences

Andrew (Digitwell) · Apr 26, 2022

@Robert Valentino What is the error message you get.
I have exactly the same code as this and it works without a problem.

iOS Question Calling routine in Page that has not been shown needs delay?

Robert Valentino

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LucaMs

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Robert Valentino

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LucaMs

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LucaMs

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Andrew (Digitwell)

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