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![Lesson 2: Creating Custom Classes in Objective-C | by Will Harrison | Introduction to iPhone Application Development | Medium Lesson 2: Creating Custom Classes in Objective-C | by Will Harrison | Introduction to iPhone Application Development | Medium](https://miro.medium.com/max/1400/1*g2_sQmh__ZBfyd39TAUg6A.png)
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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