Weak Linking in IOS
For case 3 (new class in an existing framework), you do not need to weak link to the framework, but you will need to use NSClassFromString to get a reference to the Class in order to create instances of it (and remember to handle the case where it returns nil on older versions of iOS).
How do I weak link frameworks on Xcode 4?
Go to your project -> Targets -> Build Phases -> Link Binary with Libraries.
Then change the library you want to weak-link from "Required" to "Optional".
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