OC调用Swift

Step by step swift integration for Xcode Objc-based project:

1. Create new *.swift file (in Xcode) or add it by using Finder
2. Add swift bridging empty header if Xcode have not done this before (see 4 below)

3. Implement your Swift class by using @objc attribute:

   import UIKit
   
   @objc class Hello: NSObject {
       func sayHello() {
           print("Hi there!")
       }
   }

4. Open Build Settings and check those parameters:
   • Product Module Name : myproject
   • Defines Module : YES
   • Embedded Content Contains Swift : YES
   • Install Objective-C Compatibility Header : YES
   • Objective-C Bridging Header : $(SRCROOT)/Sources/SwiftBridging.h

5. Import header (which is auto generated by Xcode) in your *.m file

   #import "myproject-Swift.h"

6. Clean and rebuild your Xcode project
7. Profit!

OC调用Swift

原文：http://www.cnblogs.com/dzhs/p/5500747.html