How to use _whyIsThisViewNotFocusable in tvOS?

Question

To debug the focus issues _whyIsThisViewNotFocusable method is available in the tvOS, But in debug in shouldUpdateFocusInContext with this command like this po [mainView _whyIsThisViewNotFocusable] or po mainView _whyIsThisViewNotFocusable it gives me error :

error: <EXPR>:1:9: error: consecutive statements on a line must be separated by ';'
mainView _whyIsThisViewNotFocusable

So what is the correct use of _whyIsThisViewNotFocusable ?

I seen this question in some stack-overflow answers but because of less reputation i can't comment in that post/answer

Answer 1

Presumably you're using swift so you shouldn't use obj-c in the debugger. Instead use:

po mainView.performSelector(Selector("_whyIsThisViewNotFocusable")) 

Answer 2

Swift 5

(lldb) po yourView.perform(Selector("_whyIsThisViewNotFocusable"))

Also you can Turn on Live Focus Logging

In your Xcode project, select Edit Scheme and add -UIFocusLoggingEnabled YES to the Arguments Passed On Launch section.

Check this readme .

Answer 3

从 iOS 11 开始，您可以使用UIFocusDebugger 。