Hi,
Thanks for the brilliant Pythonista 2.0, the appex and dialogs module are awesome.
After playing with them for a while, I found returning from some APP may cause Pythonista crash. Bellow is the code:

# coding: utf-8

import ui
import dialogs

def button_action(sender):
    dialogs.share_text('test')
    
v = ui.View(frame=(0,0,200,400))
btn = ui.Button(title='button')
btn.action = button_action
btn.center = v.center
v.add_subview(btn)

if ui.get_screen_size()[1] >= 768:
    # iPad
    v.present('popover')
else:
    # iPhone
    v.present(style='full_screen', hide_title_bar=False, orientations=['portrait'])

In the sharing dialog, choose an APP named "youdao dictionary"(An English-Chinese dictionary). The APP will show the dictionary item. Stay for a few seconds and click the OK button to return. Now Pythonista crashes.
I just tested 2 APPs, OALD and youdao dictionary. OALD is OK.

@omz Thanks for the information. That should be the cause.

@ccc Thanks. I tried the code on my friend's IOS9.2 IPhone, it also worked.
Tried to uninstall Pythonista and reinstall, with no luck. I even reseted my phone's settings, still with no luck.
Notice there is change on URL scheme on IOS9:Querying URL Schemes With canOpenURL.
With bellow code:

import webbrowser
print webbrowser.can_open('pythonista://')
webbrowser.open('pythonista://')

I got False result to any known URLs. Seems the result matches with that been told in the link.
I remember I used a loop to check 'com.slovoed.api.%d' % i URL some time ago. This may cause False result of webbrowser.can_open(), but it should not cause webbrowser.open() fail.

@ccc May I have your Pythonista version, IOS version and device type? Thanks

When I am running below code under IOS 9.2, I can't make quora run:
import webbrowser
webbrowser.open('quora://')

I tried 'quora://' in Launcher, it worked. So the URL should be right.
I remembered long ago(maybe IOS 8.x, not sure) the URL scheme worked.
I'm using Pythonista 1.5 on iPhone 6S.
Will anybody help? Thanks