BEMSimpleLineGraph is a charting library that makes it easy to create beautiful line graphs for iOS. It is easy to set-up and to use in any iOS Project. It's focused on highly customizable and interactive line graphs. Plus, it is lightweight and can be integrated in minutes.
BEMSimpleLineGraph's implementation, data source, and delegate are all modeled off of UITableView and UICollectionView. If you're familiar with using a UITableView, UITableViewController, or UICollectionView, using BEMSimpleLineGraph should be a easy.