Twitter Login in iOS App using swift 4.

Most of the time we provide the social login in app that will help user to login in app fast & smooth .

Here i have taken example of Twitter .

1: First try to follow this steps and add their SDK in App.

https://github.com/twitter/twitter-kit-ios/wiki/Installation

2: After that Go to Appdelgate.swift file and add this:

 func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

TWTRTwitter.sharedInstance().start(withConsumerKey:"xxxxxxxxxxxxxxxxxxxxx", consumerSecret:"ssabdavhjdafvdhjavdhjavdahjdvahdvahdvahjd")
}

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

TWTRTwitter.sharedInstance().start(withConsumerKey:"xxxxxxxxxxxxxxxxxxxxx", consumerSecret:"ssabdavhjdafvdhjavdhjavdahjdvahdvahdvahjd")

}

Now add this method also in Appdelegate.swift file.

 func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any]) -> Bool {
        var valueTwitter: Bool = true
        
 
        
        valueTwitter =  TWTRTwitter.sharedInstance().application(app, open: url, options: options)
        
        
        return valueFacebook
    }
    
    func application(_ application: UIApplication, shouldAllowExtensionPointIdentifier extensionPointIdentifier: UIApplicationExtensionPointIdentifier) -> Bool {
        if (extensionPointIdentifier == UIApplicationExtensionPointIdentifier.keyboard) {
            return false
        }
        return true
    }
    
   
    
    func application(_ application: UIApplication,
                     open url: URL, sourceApplication: String?, annotation: Any) -> Bool {
        var handle: Bool = true
        
        
        let options: [String: AnyObject] = [UIApplicationOpenURLOptionsKey.sourceApplication.rawValue: sourceApplication as AnyObject, UIApplicationOpenURLOptionsKey.annotation.rawValue: annotation as AnyObject]
        
        handle = TWTRTwitter.sharedInstance().application(application, open: url, options: options)
        
        
        
        return handle
    }

func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any]) -> Bool {

var valueTwitter: Bool = true

valueTwitter = TWTRTwitter.sharedInstance().application(app, open: url, options: options)

return valueFacebook

}

func application(_ application: UIApplication, shouldAllowExtensionPointIdentifier extensionPointIdentifier: UIApplicationExtensionPointIdentifier) -> Bool {

if (extensionPointIdentifier == UIApplicationExtensionPointIdentifier.keyboard) {

return false

}

return true

}

func application(_ application: UIApplication,

open url: URL, sourceApplication: String?, annotation: Any) -> Bool {

var handle: Bool = true

let options: [String: AnyObject] = [UIApplicationOpenURLOptionsKey.sourceApplication.rawValue: sourceApplication as AnyObject, UIApplicationOpenURLOptionsKey.annotation.rawValue: annotation as AnyObject]

handle = TWTRTwitter.sharedInstance().application(application, open: url, options: options)

return handle

}

3: Now write the code that will fetch user email & Name .

for this:

 @IBAction func tapTwitter_btn(_ sender: Any) {
    
        
        TWTRTwitter.sharedInstance().logIn { (session, error) in
            if (session != nil) {
                self.firstName = session?.userName ?? ""
                self.lastName = session?.userName ?? ""
                let client = TWTRAPIClient.withCurrentUser()
                client.requestEmail { email, error in
                    if (email != nil) {
                        print("signed in as \(String(describing: session?.userName))");
                        let firstName = session?.userName ?? ""   // received first name
                        let lastName = session?.userName ?? ""  // received last name
                        let recivedEmailID = email ?? ""   // received email
                      
                        
                    }else {
                        print("error: \(String(describing: error?.localizedDescription))");
                    }
                }
            }else {
                print("error: \(String(describing: error?.localizedDescription))");
            }
        }        
    }
        
    func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
        return TWTRTwitter.sharedInstance().application(app, open: url, options: options)
    }

@IBAction func tapTwitter_btn(_ sender: Any) {

TWTRTwitter.sharedInstance().logIn { (session, error) in

if (session != nil) {

self.firstName = session?.userName ?? ""

self.lastName = session?.userName ?? ""

let client = TWTRAPIClient.withCurrentUser()

client.requestEmail { email, error in

if (email != nil) {

print("signed in as \(String(describing: session?.userName))");

let firstName = session?.userName ?? "" // received first name

let lastName = session?.userName ?? "" // received last name

let recivedEmailID = email ?? "" // received email

}else {

print("error: \(String(describing: error?.localizedDescription))");

}

}else {

print("error: \(String(describing: error?.localizedDescription))");

}

func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {

return TWTRTwitter.sharedInstance().application(app, open: url, options: options)

}

4: Now you have done all the required things for fetching the user credential in App

5: Now last important things that open the twitter developer site and select your app (where you have registered your iOS app)

1.1: Now you have to call back URL for App.

2.1: To get the call back URL

a: open info.plist file and copy URL schemes.

it look like this.

copy this ” twitterkit-js5zHyDKTz2RTthfgV5xl9icA”

Note: ” twitterkit- Your Consumer Key”

and Now open your twitter developer account & select your app.

3.1: edit the App account .

4.1: go to callback URLs section and paste it.

like that.

5.1:Now save this.

6: Now you are able to fetch the user data without any issue.

if you have any issue regarding twitter login than freely to ask , we will wait for your valuable feedback

Kunal Prasad

Expert in Swift, Objective-C and MVC architecture. Skilled in REST API integration, GraphQL, custom views, and performance optimization using Xcode Profiler and advanced development tools.

26 Oct, 2021
Updated by - Aanchal Chaudhary
20 Feb, 2019
Updated by - Kunal Prasad

. . .

15 comments

taojian 7 months ago

(Error Domain=NSURLErrorDomain Code=-999 “cancelled” UserInfo={NSErrorFailingURLStringKey=https://api.twitter.com/oauth/request_token, NSErrorFailingURLKey=https://api.twitter.com/oauth/request_token, _NSURLErrorRelatedURLSessionTaskErrorKey=(
“LocalDataTask .”
), _NSURLErrorFailingURLSessionTaskErrorKey=LocalDataTask ., NSLocalizedDescription=cancelled})

Aman Bhatt 7 months ago
Can you please be more descriptive on the below points:
1. Where exactly are you getting the issue?
2. Steps to reproduce the issue.
3. Did you check the official instructions from here? https://github.com/twitter-archive/twitter-kit-ios/wiki/Installation

Reply

Sorabh Kumar 11 months ago

Hi I am unable to login.

jitendra kumar (Moderator) 11 months ago

HI Sorabh!

Can you please elaborate more on the issue you are facing?

You can also share the screenshot of the issue.

Thanks

Reply

Arjun 4 years ago

Hello, how it work in RxSwift?

Nikunj 5 years ago

when click authenticate click then move my app after open browser twitter login page

Sonu verma 5 years ago

i am not getting email id from this method
let client = TWTRAPIClient.withCurrentUser()
client.requestEmail { email, error in
if (email != nil) {
print(“signed in as \(String(describing: session?.userName))”);
let firstName = session?.userName ?? “” // received first name
let lastName = session?.userName ?? “” // received last name
let recivedEmailID = email ?? “” // received email

}else {
print(“error: \(String(describing: error?.localizedDescription))”);
}

kunal prasad (Moderator) 5 years ago
twitter account is created not only by email , it is created by phone number or other things so you will have make the check on this.

Reply
Nicholas Marriotti 5 years ago
I’m stuck at “Redirecting back to application” after authorizing my app. My URL scheme and callback URL on the Twitter dashboard match. Any idea of what’s wrong or how to fix it?

Thanks
Nick

Reply
- kunal prasad (Moderator) 5 years ago
  Please check the function in Appdelegate.swift for handling the redirect URL.
  
  Reply
  - Tarang Gupta 5 years ago
    Inside AppDelegate.swift, I have already written code like mentioned below:
    
    func application(_ application: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
    
    if TWTRTwitter.sharedInstance().application(application, open: url, options: options) {
    return true
    }
    return true
    }
    
    Still, I am not able to get redirected to my application. Any suggestion?
    
    Reply