readonly value of MultilineTextInput for iOS is inverted

[o-fedorov]

Describe the bug

For iOS, readonly=False makes MultilineTextInput read-only. readonly=True makes it editable.

Steps to reproduce

1. Build the multilinetextinput example for iOS: https://github.com/beeware/toga/tree/main/examples/multilinetextinput. Optionally, add print(self.multiline_input.readonly) to some places, like startup method, or in readonly_toggle_pressed before and after the change.
2. Launch the app.
3. Note that at startup the input is not editable. If there is a print statement, it outputs False.
4. Click on "Toggle readonly". The input is now editable, and print(self.multiline_input.readonly) will return True after the toggle is executed.

Expected behavior

By default (when readonly parameter is not provided to MultilineTextInput, it should be editable. Setting multiline_input.readonly to True should make it read-only. Settign it to False should make it editable.

Screenshots

No response

Environment

• Operating System: iOS, "iPhone 14"
• Python version: 3.8
• Software versions:
  • Briefcase: 0.3.13
  • Toga: 0.3.0

Logs

Additional context

No response

[freakboy3742]

Thanks for the report - a fairly obvious mistake (and fix). We should be auditing MultilineTextInput in the near future; but if you want to submit a PR, we'd be happy to merge it.

[o-fedorov]

@freakboy3742 done