Spotify Web API authorization/log in in swift - swift

I am trying to authorize a user for my app so I can display their Spotify data. I have read plenty of tutorials and tried to understand peoples implementation of this but I cannot get it to work. Does anyone know how to setup this login screen and connect to the Spotify Web API.

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Twitter authentication for Flutter Web

I've been struggling finding a way to make my web app obtaining token + secret from Twitter.
All packages for twitter login doesn't support web atm and I don't want to use Firebase.
Is there any way to achieve Twitter login for web without Firebase? And if so, how does it work?
Regards.

how to post data on salesforce database from iphone application?

I am developing one iPhone application in which I want to post data on the salesforce database.
I have tried from google but not got any success.
Can you please guide me?
Thanks in Advance
Salesforce provides an iOS SDK to talk to their API:
https://github.com/forcedotcom/SalesforceMobileSDK-iOS
Here is a tutorial on getting started:
http://wiki.developerforce.com/page/Getting_Started_with_the_Mobile_SDK_for_iOS
You will need to use an Oauth flow to authenticate to the API. This means you show a Login page from Salesforce.com, the user logs in, and then your UIWebView will get a redirect with a sessionId in the URL. You can extract the sessionId and use it to talk to the API for read or write access, depending on the user's permissions. The SDK includes sample code that implements all of that, so you just need to merge that code in with your app.

Rails/iPhone: recommended place of doing OAuth

I'm building a (Rails-based) web service with a mobile app (iPhone) as frontend. In order to allow people to login using Facebook, I've built something using devise and omniauth that allows the user to log in using Facebook and store the credentials in the database. This works perfectly, all from the web app.
However, now the second part: I want to let users log in via the mobile app. Of course, there are the FB Connect libraries, but they give the mobile app access to the Graph API. Instead, I would like a mobile log-in screen that authorizes Rails to access the data. This is because later on, users might use both the iPhone app and web app.
What would be the recommended way of doing this? Are there any best practices?
I solved it by doing the authorization using FB Connect and the FB app. After authorizing, the FB app opens my app again, and I can read out the access token. Which I can then send to the server and use there.

Barebones Facebook Connection with flashbuilder 4.5 (mobile app)

I am looking for a barebones facebook connection from pure actionscript to use in a mobile. Does anyone know of any examples. Been having a hard time finding what I want in Google
Thanks!
You cant connect to facebook with only actionscript - flash does not implement OAuth which you need to get a valid access token.
You have to either get an access token through PHP, or Javascript.
If you are making a mobile web-app you can check out
http://blog.yoz.sk/2010/04/facebook-now-with-oauth-and-open-graph/
Jozef Chúťka put together a great walkthrough and classes for AS3 and facebook.
So you can make a web app or use a web view in AIR to handle your authentication.

How do I authenticate a Google user on the iPhone using GData?

I am new in iphone application. I want to make a simple application in which User can login from google and facebook. I have integrate API's for both of them. I have also completed the facebook connection but I dont know how to validate the Google user with its API (Gdata).
Can anybody please help me for authentication of google account using iphone application.I just want to check wether user is valid google user or not that's it. Please help me for that.
Thanks in advance..
Google supports OpenID, though that is typically just used by websites.
There is also authentication for Google accounts called ClientLogin; the Objective-C GData library provides routines to authenticate via ClientLogin to a Google account for use with a specific Google service API.
What is it that your application will do for authenticated users that it would not do for unauthenticated users?