The Coinbase Wallet Mobile SDK is available on both CocoaPods and Swift Package Manager.

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Cocoapods

Add Coinbase Wallet SDK to your Podfile. 
use_frameworks!

target 'YOUR_TARGET_NAME' do
    pod 'CoinbaseWalletSDK', '1.0.3'
end
Replace YOUR_TARGET_NAME, and then in the Podfile directory run: 
pod install

​
Swift Package Manager

Add Coinbase Wallet SDK to your Package.swift file. Under File > Add packages… enter the package url: https://github.com/MobileWalletProtocol/wallet-mobile-sdk 
import PackageDescription

let package = Package(
    name: "YOUR_PROJECT_NAME",
    dependencies: [
        .package(url: "https://github.com/MobileWalletProtocol/wallet-mobile-sdk.git", from: "1.0.3"),
    ]
)
Replace YOUR_PROJECT_NAME, and then run: 
swift build