iOS Question Request for page scroll tutorial

Andrew Lindsay · Oct 26, 2015

Is there anyone that could provide a short example of how to scroll a text box up above the height of a keyboard?
I have played around a bit but can't seem to get it to work.
Best regards
Andrew

Erel · Oct 26, 2015

Check the attached example. The layout is made of a ScrollView that holds another layout.
The ScrollView content size is the same as the page size.
The ScrollView size changes based on the keyboard state.

Ed Brown · Dec 31, 2015

I've downloaded the scrollview example (thank you) but I'm not able to scroll.
Am I missing something crucial?

What I am expecting is that the scrollview is loaded with a layout and when the iPhone is flipped horizontally then the scrollview will allow the loaded layout within it to be scrolled.

Erel · Dec 31, 2015

This example demonstrates how you can use a ScrollView to allow the user to scroll the layout when the keyboard appears. It is similar to Android built-in pan mode.

This is the complete code:

B4X:

Private Sub Page1_Resize(Width As Int, Height As Int)
   ScrollView1.ContentHeight = Height
   ScrollView1.ContentWidth = Width
   ScrollView1.Height = Height - KeyboardHeight
End Sub

Private Sub Page1_KeyboardStateChanged (Height As Float)
   KeyboardHeight = Height
   If Page1.RootPanel.Width > 0 And Page1.RootPanel.Height > 0 Then
     Page1_Resize(Page1.RootPanel.Width, Page1.RootPanel.Height)
   End If
End Sub

It will not be scrollable if the keyboard is not visible. You can change the content height for this.

Ed Brown · Dec 31, 2015

You can change the content height for this.

This was the missing link for me. I made the assumption that the scrollview would scroll the contents of the layout once the panel had been loaded with the layout. I needed to set the ContentHeight to the height of the loaded layout.

iOS Question Request for page scroll tutorial

Andrew Lindsay

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Erel

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Ed Brown

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Erel

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Ed Brown

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