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Hiya
I’m trying to fill a tableView with rows one after the other with a slight delay between each cell appearing.

This is how I’m trying to do it - but they all still appear in one go:

def tableview_cell_for_row(tableview, section, row):
    cell =ui.TableViewCell("subtitle")
    data = tableview.data_source.items[row]
    cell.bg_color = (0,1,0,0.1)
    cell.text_label.font= ('system',(17*Hmult))
    cell.text_label.text_color = (0,1,0,0.0)
    cell.text_label.text = str(data)
    selected_cell = ui.View()
    selected_cell.bg_color = (0,1,0,0.2)
    selected_cell.text_color = (0,1,0,1.0)
    cell.selected_background_view = selected_cell
    def anim():
        if len(tableview.data_source.items) != row:
            print(row)
            cell.text_label.text_color = (0,1,0,0.5)
            ui.delay(anim,0.2)
    ui.delay(anim,0.2)
    return cell

@rb Put your delay in filling, not in display

import ui
import time

def tableview_cell_for_row(tableview, section, row):
    cell =ui.TableViewCell("subtitle")
    data = tableview.data_source.items[row]
    cell.bg_color = (0,1,0,0.1)
    cell.text_label.text = str(data)
    selected_cell = ui.View()
    selected_cell.bg_color = (0,1,0,0.2)
    selected_cell.text_color = (0,1,0,1.0)
    cell.selected_background_view = selected_cell
    return cell

v = ui.View()
f = (0, 0, 600, 800)
v.frame = f
tbl = ui.TableView()
tbl.frame = f
tbl.data_source = ui.ListDataSource(items=[])

tbl.data_source.tableview_cell_for_row = tableview_cell_for_row
v.add_subview(tbl)
v.present('sheet')
for i in range(1,20):
    time.sleep(0.2)
    tbl.data_source.items.append(i)

Édit: but all rows are redisplayed when a new row is added

You can also use update

import ui

def table_tapped(sender):
    rowtext = sender.items[sender.selected_row]
    print(rowtext)

class TableUpdate(ui.View):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.reset_value = 2
        self.stop_value = 20
        self.value = self.reset_value
        self.state = 'stop'
        self.update_interval = 1
        self.add_subview(ui.TableView(name='tableview1', frame=(0,0,400,400)))
        self.reset_table_view()
        self.add_subview(ui.Button(title='Reset', frame=(50,450,100,100), action=button_action))
        self.add_subview(ui.Button(title='Start', frame=(160,450,100,100), action=button_action))
        self.add_subview(ui.Button(title='Stop', frame=(270,450,100,100), action=button_action))

    def reset_table_view(self):
        self.value = self.reset_value
        self.update_table_view()

    def update_table_view(self):   
        self['tableview1'].data_source = ui.ListDataSource(range(self.value))
        self['tableview1'].data_source.action  = table_tapped
        self['tableview1'].delegate = self['tableview1'].data_source
        self['tableview1'].reload_data()            

    def update(self):
        if self.state == 'run':
            if self.value < self.stop_value:
                self['tableview1'].data_source.items.append(self.value)
                self['tableview1'].reload_data() 
                self.value += 1           
        self.set_needs_display()

def button_action(sender):
    v1 = sender.superview   
    if sender.title == 'Reset':
        v1.state = 'stop'
        v1.reset_table_view()
    elif sender.title == 'Start':
        v1.state = 'run'
    elif sender.title == 'Stop':
        v1.state = 'stop'

v = TableUpdate(frame=(0,0,400,500), name='view1')
v.present('sheet') 

@rb If you want to vary opacity

import ui
import time

def tableview_cell_for_row(tableview, section, row):
    global t
    cell =ui.TableViewCell("subtitle")
    data = tableview.data_source.items[row]['title']
    opac = tableview.data_source.items[row]['opacity']
    cell.bg_color = (0,1,0,0.1)
    cell.text_label.text = str(data)
    cell.text_label.text_color = (0,1,0,opac)
    selected_cell = ui.View()
    selected_cell.bg_color = (0,1,0,0.2)
    selected_cell.text_color = (0,1,0,1.0)
    cell.selected_background_view = selected_cell
    return cell

v = ui.View()
f = (0, 0, 600, 800)
v.frame = f
tbl = ui.TableView()
tbl.frame = f
tbl.data_source = ui.ListDataSource(items=[])
for i in range(1,21):
    tbl.data_source.items.append({'title':i,'opacity':0.0})
tbl.data_source.tableview_cell_for_row = tableview_cell_for_row
v.add_subview(tbl)
v.present('sheet')
sec_per_row = 1.0
nbr_opacities = 10
for row in range(0,len(tbl.data_source.items)):
    for t in range(1,nbr_opacities):
        time.sleep(sec_per_row/nbr_opacities)
        tbl.data_source.items[row]['opacity'] = t/nbr_opacities
        tbl.reload()

Guys, this is what insert_rows is for! Don't use reload_table!

@JonB the worst is that I had read it 😢 Shame on me

I’m actually using the reload method and it seems fine - I guess it’s just really inefficient is that what your saying @JonB ?
Thanks for help so far everyone.