iOS Question Completely remove the data from page once I leave it?

Shay · Jan 29, 2015

I have strange problem
I am using this code on each code module page:

B4X:

Public Sub Show
    If PG.IsInitialized = False Then
        PG.Initialize("pg")
        PG.RootPanel.LoadLayout("PageX")
        PG.Title = Main.AppTitle
        PG.RootPanel.Color = Colors.RGB (54,54,54)
        PG.HideBackButton = True ' block button back
    End If
    Main.NavControl.ShowPage(PG)

the problem is when I leave the page and come back to it
all the data is still there (can be also CustomListVew with data)

When I am leaving the page I tried even :

B4X:

    PG.RootPanel.RemoveAllViews   
    PG.RootPanel.RemoveViewFromParent
    scvMain.RemoveViewFromParent
    PG.RootPanel.RemoveAllViews
    Main.NavControl.RemoveCurrentPage

but once I enter the page again all my vars (such as PG, scvMain, etc..) are still initialized
(also tried to init them again, did not help)

How do I completely remove the data from page once I leave it?

susu · Jan 29, 2015

Try to move all that "remove" into

Private Sub pg_Disappear
...
End Sub

Erel · Jan 30, 2015

You can put the page in a class instance and then create a new instance any time you want a new page.

Shay · Feb 9, 2015

I need your help writing this class,
(never wrote class)
I wrote this, but the issue is that it is not recognizing the layout objects, so it crash on first object (such as label)
(also editor is marking all the vars as not initialized)

B4X:

'Class module
Sub Class_Globals
    Public PG As Page
End Sub

'Initializes the object. You can add parameters to this method if needed.
Public Sub Initialize(Layout As String)

    If PG.IsInitialized = False Then
     PG.Initialize("pg")
     PG.RootPanel.LoadLayout(Layout)
     PG.Title = "MyApp"
     PG.HideBackButton = True ' block button back
    End If
    Main.NavControl.ShowPage(PG)
  
End Sub

Erel · Feb 10, 2015

You should move all the code from the module to the class. The views variables should be declared in the class.

Shay · Feb 10, 2015

but I have many modules and for each module it has it own layout, so can't I do something generic in the class, or I need class for each page/module?

Erel · Feb 10, 2015

You just need to use classes instead of modules. This way you will be able to create new instances of your pages.

(assuming that you really want to clear the state of each page).

Shay · Feb 10, 2015

Tried:
I moved all the code from the module to class (Class name NewPage)
from module1 I am writing:
Dim Step3 As NewPage
Step3.Show

on Class it is crashing on:
If PG1.IsInitialized = False Then

Class (b4i_httpjob) instance released.
Error occurred on line: 21 (newpage)
Target is null. Method called: IsInitialized
Stack Trace: (
CoreFoundation <redacted> + 154
libobjc.A.dylib objc_exception_throw + 38
CoreFoundation <redacted> + 0
Get Client +[B4I runDynamicMethod:method:throwErrorIfMissing:args:] + 196
Get Client -[B4IShell runMethod:] + 496
Get Client -[B4IShell raiseEventImpl:method:args::] + 1846
Get Client -[B4IShellBI raiseEvent:eventarams:] + 1316
Get Client __33-[B4I raiseUIEvent:eventarams:]_block_invoke + 74
libdispatch.dylib <redacted> + 10
libdispatch.dylib <redacted> + 22
libdispatch.dylib <redacted> + 254
CoreFoundation <redacted> + 8
CoreFoundation <redacted> + 1300
CoreFoundation CFRunLoopRunSpecific + 522
CoreFoundation CFRunLoopRunInMode + 106
GraphicsServices GSEventRunModal + 138
UIKit UIApplicationMain + 1136
Get Client main + 116
libdyld.dylib <redacted> + 2
)

Shay · Feb 10, 2015

ok, I figure it
I changed the subname from "show" to:
Public Sub Initialize

iOS Question Completely remove the data from page once I leave it?

Shay

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susu

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Erel

B4X founder

Shay

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Erel

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Shay

Well-Known Member

Erel

B4X founder

Shay

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Shay

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