Below are mentioned some of the best open source libraries available for iOS.

1. Realm
2. SwiftlyJSON
3. Chameleon
4. Kingfisher
5. Hero

Realm
Apart from iOS, Realm is a mobile database that runs on different platforms. Realm runs directly inside tablets, wearables and phones too. Also, when it comes to persistence, it is a stellar cross-platform option to Core Data.

SwiftlyJSON
Doing exactly what the name suggests, Swiftly JSON helps in swiftly parsing JSON in Swift. It is well known that parsing JSON in Swift is tricky, but Swiftly JSON protects you from all the nested type casting and ifs issues that make deserializing model objects challenging.

Chameleon
Chameleon is a lightweight flat color framework for iOS by Vicc Alexander. Nevertheless, one should never underestimate its potential and power. If you actually have design in mind but don’t desire to spend hours coiling your head around RGB values, Chameleon is the library you will cherish.

Best iOS libraries To Check Out In 2021

Kingfisher
Kingfisher is known as an absolute Swift library for asynchronous downloads. This lightweight library can be employed for caching images from the web. The library downloads the wanted images from the URL and sends them to both disk cache and memory. The Kingfisher library is displayed in NSImageView, NSButton, UIImageView or UIButton.

Hero
Hero is the library that will be your rescuer if you are working with an iOS view controller. Hero is a sprightly layer over UIKit’s complex transition APIs. Custom transitions are no longer a concern for developers with the Hero library.