http://keeping.hatenablog.jp/entry/2018/10/22/010748

SwifterWrapper.swift

import Foundation
import Swifter

@objc class SwifterWrapper: NSObject {
    
    @objc static let share: SwifterWrapper = SwifterWrapper()
    private var twitter: Swifter?
    private var callbackUrl: URL?
    
    private override init() {
    }

    // MARK: - キーとシークレットの設定
    
    @objc func setup(consumerKey: String, consumerSecret: String) {
        callbackUrl = URL(string: "twitterkit-" + consumerKey + "://")
        twitter = Swifter(consumerKey: consumerKey, consumerSecret: consumerSecret)
    }
    
    // MARK: - スキーマのコールバックハンドリング
    
    @objc class func handleOpen(url: URL) -> Bool {
        Swifter.handleOpenURL(url)
        return true
    }
    
    // MARK: - 連携
    
    @objc func login(controller: UIViewController, success: @escaping (_ userID: String?, _ screenName: String?, _ token: String?, _ tokenSecret: String?) -> Void, failure: @escaping (_ error: Error?) -> Void) {
        
        guard let callbackUrl = self.callbackUrl else {
            failure(nil)
            return
        }
        
        twitter?.authorize(withCallback: callbackUrl, presentingFrom: controller, success: { (accessToken, _) in
            
            guard let key = accessToken?.key else {
                failure(nil)
                return
            }

            guard let secret = accessToken?.secret else {
                failure(nil)
                return
            }
            
            guard let userID = accessToken?.userID else {
                failure(nil)
                return
            }
            
            guard let screenName = accessToken?.screenName else {
                failure(nil)
                return
            }
            
            success(userID, screenName, key, secret)
        }, failure: { (error) in
            failure(error)
        })
    }
    
    // MARK: - つぶやき投稿
    
    func inviteTweet(status: String, media: Data?) {
        guard let media = media else {
            twitter?.postTweet(status: status)
            return
        }
        twitter?.postTweet(status: status, media: media)
    }
}