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iOS Tests working with Objective-C and Swift class together | by MonGuNare | If let swift = Programming! | Medium
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Lesson 2: Creating Custom Classes in Objective-C | by Will Harrison | Introduction to iPhone Application Development | Medium
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objc' can only be applied to an extension of a class , calling extension method from swift to objective c - Stack Overflow
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Leben See Taupo Schlacht objc can only be used with members of classes Aufregung In Menge Sand in die Augen streuen
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