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I have found an issue with the dialogs module and I'm not sure why @omz you might be able to explain.

The code here is a simple example of it.

# coding: utf-8
import ui
import dialogs

def dia_test(sender):
    dialogs.form_dialog(title='Test',fields=[{'type':'text','title':'Some Title'}])

class testtv (object):

    def tableview_did_select(self, tableview, section, row):
        dia_test(None)

    def tableview_number_of_rows(self, tv, s):
        return 1

    def tableview_cell_for_row(self, tv, s, r):
        cell = ui.TableViewCell('default')
        cell.text_label.text = 'Test'
        cell.selectable = True
        return cell



view = ui.TableView()
dbo = testtv()
view.data_source = dbo
view.delegate = dbo
view.right_button_items = [ui.ButtonItem(title='Press me!', action=dia_test)]
view.present()

When I click the bar button item press me the form dialog appears ok and I can click done and it dismisses happily.
If I call the same function from the tableview_did_select The form dialog appears but when I click done I get the following error

Traceback (most recent call last):
File "/var/mobile/Containers/Bundle/Application/CEBD1281-94B0-4EEC-BA60-D9599A5873CD/Pythonista.app/Frameworks/PythonistaKit.framework/pylib/site-packages/dialogs.py", line 365, in done_action
self.container_view.close()
AttributeError: 'NoneType' object has no attribute 'close

I hope all this code has formatted happily I'm posting this from my mobile and the form isn't that great.

Does anyone have any thought as to a workaround for this?

I assume this is a bug in the dialogs module.

Here is the fix. The problem is that dialogs produces a model view, and Python needs to know that, or bad things happen. This is done by using the decorator @ui.inbackground.

# coding: utf-8
import ui
import dialogs

@ui.in_background
def dia_test(sender):
    dialogs.form_dialog(title='Test',fields=[{'type':'text','title':'Some Title'}])

class testtv (object):

    def tableview_did_select(self, tableview, section, row):
        dia_test(None)

    def tableview_number_of_rows(self, tv, s):
        return 1

    def tableview_cell_for_row(self, tv, s, r):
        cell = ui.TableViewCell('default')
        cell.text_label.text = 'Test'
        cell.selectable = True
        return cell



view = ui.TableView()
dbo = testtv()
view.data_source = dbo
view.delegate = dbo
view.right_button_items = [ui.ButtonItem(title='Press me!', action=dia_test)]
view.present()

Thanks that works a treat