unpack weak property using '?' instead of '!' in swift #31

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guzhenhuaGitHub wants to merge 1 commit into strongself:master from guzhenhuaGitHub:master

guzhenhuaGitHub commented Jul 16, 2019 •

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weak property will get nil in an async callback, and it will cause crashes


          unpack weak property using '?' instead of '!' in swift

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