Can objective-c code call swift extension on Class?

objective-c swift swift-extensions
sprhawk picture sprhawk · Nov 24, 2014 · Viewed 52.3k times · Source

I searched some posts, I think I cannot write an extension under swift, and call it from Objective-C code, right ?

@objc like attributes only support methods, class, protocols ?

Answer

marius bardan picture marius bardan · Feb 4, 2015

You can write a Swift extension and use it in Objective-C code. Tested with XCode 6.1.1.

All you need to do is:

  • create your extension in Swift (@objc annotation needed since Swift 4.0.3)

  • #import "ProjectTarget-Swift.h" in your Objective-C class (where "ProjectTarget" represents the XCode target the Swift extension is associated with)

  • call the methods from the Swift extension

Related questions

Self.Type cannot be directly converted to AnyClass in extension to objective-c class in swift

I'm trying to create fabric method to create UIViewController with correct nib name (to fix iOS8 default initialiser issue). To do it I have added extension: extension UIViewController { class func create() -> Self { if #available(iOS 9.0, *) { return self.init() } …

Read More
Passing Data between View Controllers

I'm new to iOS and Objective-C and the whole MVC paradigm and I'm stuck with the following: I have a view that acts as a data entry form and I want to give the user the option to select multiple …

Read More
How do I make an HTTP request in Swift?

I read The Programming Language Swift by Apple in iBooks, but cannot figure out how to make an HTTP request (something like cURL) in Swift. Do I need to import Obj-C classes or do I just need to import default …

Read More