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Swift

Swift 3 GCD

Xcode 8 Official version has been released,I want the first time my project to the Swift 3 --After all, this is a trend。

During the migration process, I encountered a lot of problems--such as Xcode provides automated migration tool is not working,I've been waiting for more than two hours,after that I give up,I chose to manually migrate--after all,,Xcode's auto-correction is also very good。

however--[……]

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