/WSAssetPickerController

A multi-image picker similar to UIImagePickerController but allows selection of multiple images.

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WSAssetPickerController 🌇

This project is out of date with iOS and has been deprecated. The last version 0.2.1 will remain available via CocoaPods.

Other Options

There are plenty of other options for similar libraries available via CocoaPods.

Another solution might be to use the the Photos framework added by Apple in iOS 8.