Porting an Objective-C block to Swift

Question

I am porting a game I made in Objective c to swift as it is a good way to learn how to port something and how to mix swift with objective c and objective c with swift.

But after lots of searching I can't find how to port this line of code:

GCControllerDirectionPadValueChangedHandler dpadMoveHandler = 
 ^(GCControllerDirectionPad *dpad, float xValue, float yValue) { }

Only thing I found was this piece of code from apple:

Swift

typealias GCControllerDirectionPadValueChangedHandler = 
 (GCControllerDirectionPad!, CFloat, CFloat) -> Void

OBJECTIVE-C

typedef void (^GCControllerDirectionPadValueChangedHandler)
   (GCControllerDirectionPad *dpad, float xValue, float yValue)

--

This is the code I've tried so far, but with no luck.

var dpadMoveHandler: GCControllerDirectionPadValueChangedHandler = 
   (#dpad:GCControllerDirectionPad, #xValue:CFloat, #yValue:CFloat)  {

    }

Lou Franco · Accepted Answer · 2014-06-18 23:50:45Z

3

That line declares an Objc block. The typealias you're looking at in Swift is a closure type. The equivalent code would be this:

var dpadMoveHandler:GCControllerDirectionPadValueChangedHandler = 
  { 
     (dpad:GCControllerDirectionPad!, xValue:CFloat, yValue:CFloat) -> () in 
     return 
  }

Read about Swift closures here.

edited Jun 18, 2014 at 23:50

Lou Franco

89.3k14 gold badges137 silver badges199 bronze badges

answered Jun 18, 2014 at 23:06

Joseph Mark

9,4284 gold badges31 silver badges31 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Porting an Objective-C block to Swift

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related