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Dealing with validModesForFontPanel signature change
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Dealing with validModesForFontPanel signature change


  • Subject: Dealing with validModesForFontPanel signature change
  • From: David Catmull <email@hidden>
  • Date: Thu, 14 Sep 2017 10:07:36 -0600

In the 10.13 SDK, the return type for NSObject.validModesForFontPanel()
changed from Int to NSFontPanel.ModeMask. This is problematic for backwards
compatibility because the different signature means it's considered to be a
new function, different from the one that's been around since 10.3.

If I simply update my function to match the new signature, then I have to
change my deployment target to 10.13, which I'd rather not do just yet.

I also tried going with the auto-fix suggestion of using @available to make
the function 10.13 only. This would mean a minor loss of functionality on
10.12... but it doesn't work because my override isn't allowed to have
different availability from the base version.

I also tried installing the 10.12 SDK and building against that, but it's
not compatible with Xcode 9 GM's Swift 3.2.

So once I start using Xcode 9 regularly, I basically have to comment that
function out until I want to require 10.13 for my app. Are there any other
options?
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