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I have two UI's, where I wish to make it so that when a button on the first UI is pressed, the other one opens. However when the button is pressed, it says "view is already running". Can I not have both active at once? If not how do I remove the first UI so I can activate the second one?

Due to some bugs in how views get closed in pythonista, you cannot easily re-present a view that was already presented. (There might be some caveats, I forget)

So I'm guessing that you can display view B, but when trying to show view A again, you get the failure.

One approach is to use a NavigationView, which will give you the sliding animation. Another approach is to have both views as subviews to a root view, and either add/remove from the root, or hide/unhide, or send_to_front, etc.

If you are talking about a main view and a pop up menu, you can present the second view as a sheet (instead of fullscreen).

Perhaps also play with modal, try this

import ui

v1 = ui.View()
v1.background_color = 'yellow'
v1.name = 'v1'
b1 = ui.Button()
b1.title = 'view v2'
b1.frame = (10,10,100,20)
v1.add_subview(b1)
v1.present()

v2 = ui.View()
v2.background_color = 'cyan'
v2.name = 'v2'
b2 = ui.Button()
b2.title = 'close v2'
b2.frame = (10,10,100,20)
def b2_action(sender):
    v2.close()
b2.action = b2_action
v2.add_subview(b2)

def b1_action(sender):
    v2.present()
    v2.wait_modal()
b1.action = b1_action

I wanted to post this when you recently posted this but if you still need it, here you go. You can even do more views as long as you old_view.close() then old_view.wait_modal() then new_view.present()

import ui
import dialogs

v1 = ui.View()
v1.bg_color = "#eee"
v1.name = "v1"

v2 = ui.View()
v2.bg_color = "#444"
v2.name = "v2"

item_list = []
entries = 28
for i in range(entries):
    item_list.append("Item " + str(i + 1))

def button_item_action(sender):

    if sender is v1Btn:
        v1.close()
        v1.wait_modal()
        v2.present('fullscreen')
    else:
        v2.close()
        v2.wait_modal()
        v1.present('fullscreen')

def list_action(sender):
    s = dialogs.list_dialog("Select an Item", item_list)
    if s is not None:
        lblList.text = s

temp_a, temp_b = ui.get_window_size()
w = min(temp_a, temp_b)
h = max(temp_a, temp_b)
m = 0.05 * w

v1List = ui.Button()
v1List.tint_color = "#222"
v1List.image = ui.Image('iob:navicon_32')
v1List.frame = (m, m, 0.1 * w, 0.1 * w)
v1List.action = list_action
v1List.border_width = 1

lblList = ui.Label()
lblList.bg_color = "#fff"
lblList.x = v1List.x + v1List.width + m
lblList.y = m
lblList.width = w - lblList.x - m
lblList.height = v1List.height
lblList.border_width = 1
lblList.alignment = ui.ALIGN_CENTER

v1Btn = ui.ButtonItem(title="Open v2")
v2Btn = ui.ButtonItem(title="Open v1")
v2Btn.action = v1Btn.action = button_item_action

v1.add_subview(v1List)
v1.add_subview(lblList)
v1.right_button_items = (v1Btn,)
v2.right_button_items = (v2Btn,)
v1.present('fullscreen')

lblList.autoresizing = "W"

@ts said:

...view.wait_modal...

Aha! wait_modal Seems to be the trick! Cool!