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To be able to integrate Twitter functionality into our iOS apps, we need to use the Twitter framework. So first we need to add this framework to our app. Follow these steps to add the Twitter framework to your app:
Click on your project icon in Xcode.
Select the target to which you want to add the Twitter framework.
On the top, select Build Phases.
Expand the Link Binary with Libraries box to see all the frameworks that are currently linked to your target.
Click on the little + button at the bottom-left corner of the “Link Binary with Libraries” box.