Dyld: Symbol Not Found: _Nsurlauthenticationmethodclientcertificate When Trying to Run iOS App

dyld: Symbol not found: _NSURLAuthenticationMethodClientCertificate when trying to run iOS app

Edited to include two possible steps you need to take:

1. Make sure you have Foundation framework to your project. (Remove
   and add it again to be sure).
2. Make sure the Foundation framework include is before CFNetwork.

There seems to be a change in which headers include what in iOS8.0 (the glextensions file, for example, is no longer in the top header). If you explicitly add Foundation framework to your project, it will build fine. Making CFNetwork optional will, of course, lead to failures and is only a solution for the build error and not a solution overall.

dyld: Symbol not found: _UITransitionContextFromViewControllerKey

This is because UITransitionContextFromViewControllerKey doesn't exist until iOS 7. Working around this probably isn't worth the effort--it means dropping all usage of UIViewControllerContextTransitioning, as the protocol is new in iOS 7, or creating a separate code path for iOS 6. If that's what you want, look into weak-linking UIKit, although this may result in slow startup.

dyld: Symbol not found: error in iOS 3.2

NSCache class is available starting iOS4.0, so attempt to use it on 3.2 will result in error. If you don't use it directly - check if you use some other classes/methods (or may be 3rd-party libs) that are 4.0+ only - they may use NSCache internally.

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