This talk will provide a crash course in exploiting iOS applications through the manipulation of the Objective-C runtime. The aim is to provide practical examples (live demos!) of how to observe and manipulate the inner workings of applications on iOS to defeat security protections including jailbreak prevention, anti-debugging and certificate pinning, obtain credentials and other sensitive information and subvert business logic. The presentation will also touch on how these techniques may potentially be applied to exploit iOS applications written in Swift.