Open Radar

 
Duplicate of 22163138

Summary:
The `hasFocus` `XCUIElementAttribute` is only available on tvOS. This would be very handy to have access too on other OS's, particularly on macOS.

Steps to Reproduce:
When running an XCUITest against a macOS app, attempt to access the `hasFocus` property on an XCUIElement. Note that it is not accessible, but other properties such as `isEnabled` are accessible.

Expected Results:
Expected to be able to access the `hasFocus` property on an XCUIElement.

Actual Results:
Unable to access the `hasFocus` property on the XCUIElement.

Version/Build:
Xcode 10.2 (10E125)

Notes:
I was able to deduce that `hasFocus` is only available on tvOS be looking at the `XCUIElementAttributes.h` file, where on line 69 we have:

```objc
#if TARGET_OS_TV
/*! Whether or not the elment has UI focus. */
@property (readonly) BOOL hasFocus;
#endif
```

Another solution to this issue would be to simply update [the documentation](https://developer.apple.com/documentation/xctest/xcuielementattributes/1627636-hasfocus) to mention that this property is only available on tvOS. This is less preferable, but would at least solve part of the problem.