smartystreets-ios-sdk
The official client libraries for accessing SmartyStreets APIs from Objective-C and Swift.
"Getting started with the SmartyStreets iOS SDK in Objective-C" (Click to play on YouTube)
"Getting started with the SmartyStreets iOS SDK in Swift" (Click to play on YouTube)
"Getting started with the SmartyStreets iOS/macOS SDK" (Click to play on YouTube)
You may have noticed this page is curiously sparse. Don't panic, there's documentation and examples.