SalesForce on iOS login without using the SalesForce Webview?

I'm creating an iPhone application that uses salesforce as it's server-side data component, I need to access the database from the application to retrieve data for whichever user logs into the app, to do this I need to authenticate with Sales force. salesforce developer training online

I'm using the Rest API Template that was available in XCode after installing SalesForce, but I keep getting this: