Open Radar

 
Summary:
When UITextField’s font property is set to nil, it immediately reverts to its default value. On tvOS 11, it reverts to a value that is half its default value.

Xcode 9.0 (9M189t) on macOS 10.12.6 (16G29)

Steps to Reproduce:
1. Create a UITextField.
2. Inspect its font and observe that it has a size of 38 points.
3. Set the text field’s font to something besides the default.
4. Inspect the text field and confirm that its font is the correct new value.
5. Set the text field’s font back to nil.
6. Inspect the text field’s font value. Even though it was just set to nil, it now has a default value. This is expected behavior.
7. Inspect the new font’s point size.

Expected Results:
The point size is the same value as the starting value: 38 points.

Actual Results:
The point size is now 17 points - half the original default value.

Version:
tvOS 11.0 (15J5333e)

Notes:
You can see this all in action in the attached Xcode project. Run the unit tests 4 times with the following settings:

Scheme: FontSizer-tvOS, tvOS 11.0
Scheme: FontSizer-tvOS, tvOS 10.2 (the one I happened to be testing on).
Scheme: FontSizer-iOS, iOS 11.0
Scheme: FontSizer-iOS, iOS 10.0 (again, the one I happened to be testing on).

You will notice that the only time the test fails is on tvOS 11.0.

Attached project also posted at https://cl.ly/ls9j