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Continue to Chat5 ways to do the callbacks in objective C and iOS dev https://www.stlplace.com/2013/06/29/5-ways-to-do-the-callbacks-in-objective-c-and-ios-dev/
5 ways to do the callbacks in objective C and iOS dev https://www.stlplace.com/2013/06/29/5-ways-to-do-the-callbacks-in-objective-c-and-ios-dev/