Calling Swift Closure Inside Closure

Question

I have the following code:

  twitterAPI?.verifyCredentialsWithUserSuccessBlock({ (userName, password) -> Void in


            twitterAPI?.getUserTimelin         


        

Answer 1

Try:

        twitterAPI?.verifyCredentialsWithUserSuccessBlock({ (userName, password) -> Void in
            self.twitterAPI?.getUserTimelineWithScreenName(userName, successBlock: { (objects :[AnyObject]!) -> Void in

                }, errorBlock: { (error :NSError!) -> Void in
            })

            return  // <-- ADDED

            }, errorBlock: { (error :NSError!) -> Void in
        })

In this case

{ (userName, password) -> Void in
    self.twitterAPI?.getUserTimelineWithScreenName("", successBlock: { (objects :[AnyObject]!) -> Void in
    }, errorBlock: { (error: NSError!) -> Void in
    })
}

is a "single expression closure" that has implicit non Void return.

As of Xcode 6.2 / Swift 1.1, you need explicit return here.

Or, use Xcode 6.3 / Swift 1.2 that has fixed this problem.

See this question: One-line closure without return type or Swift - 'Bool' is not a subtype of 'Void'?