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Now My app is using Assets library Frameworks which is only available on iOS 4.0 and later for multi-choosing photos, but I want my app runs on devices with iOS 3.2.
Could I link the Assets library dynamically? If so I could judge whether the iOS SDK version is earlier than 4.0, if earlier I would use UIImagePickerController instead of Assets library, if later I could load Assets library dynamically and implement multi-choosing using it.
You can set the framework to weak linking. When you select a framework in Xcode 4 you can switch the target membership in the right pane between optional / required.
You should read Adding Runtime Checks for Newer Symbols in the docs.
Basically you can check the runtime availability of a class :
or