How to access swift class in objective-c file - ios

Question

I have a swift project and i import a singleton, objective-c coded class in the project.
I tried to import the productname_swift.h file but no luck.
How can i access swift class in that singleton class?

Answer 1

Project made in Swift : To use Swift class in Objective C
To use Swift class in Objective C , follow given steps :
Create one Objective C class named User.
A popup display with "Would You like to configure an Objective-C bridging Header". Choose Create Bridging Header.
User.h
#import <Foundation/Foundation.h>
#interface User : NSObject
+(id) sharedUser ;
#end
User.m
#import "User.h"
#import "SwiftInObjectiveC-swift.h"
#implementation User
//Singleton of User
+(id)sharedUser{
static User *sharedUser = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedUser = [[self alloc] init];
//Class Method of ViewController.swift
[ViewController mySwiftClassFunction];
//Instance Method of ViewController.swift
ViewController *vc = [[ViewController alloc] init];
[vc mySwiftFunction];
});
return sharedUser;
}
-(void) myObjcectivecMethod {
ViewController *vc = [[ViewController alloc] init];
[vc mySwiftFunction];
}
Add #objc in your .swift class in front of Class name.
import UIKit
#objc class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func mySwiftFunction() {
print("Swift Function")
}
class func mySwiftClassFunction (){
print("Swift Class Function")
}
}
Go to Build Settings.
Set Product Module Name : ProjectName
Set Defines Module : YES
Set Embedded Content Contains Swift : YES
Set Install Objective-C Compatibility Header : YES
Set Objective-C Bridging Header : SwiftInObjectiveC/SwiftInObjectiveC-Bridging-Header.h
Import Auto generated header "ProjectName-swift.h" in your *.m file.
Clean and Run your Project.
It will work!!!
Follow Apple link for Mix and Match for detailed information.

Answer 2

It is very simple use Swift classes in Objective-C. Just follow steps given below
Open your Objective-C project.
Add a new swift file to the project.
One default dialogue will open to create a bridging header (If it
does not open by default, add a bridging header file).
Go to build settings type Swift Compiler and you will see Your
ProjectName-Swift.h in Swift Compiler- General like below
Import you desired swift classes build and run.

Answer 3

Adding multiple Swift files to an Objective-C project.
Let’s say you want to add Class1.swift, Class2.swift, and Class3.swift file to the SwiftToObjC project
Add Class1.swift file to the project.
XCode will ask "Would You like to configure an Objective-C bridging Header"? You choose "Create Bridging Header". So the SwiftToObjC-Bridging-Header.h file as well as the SwiftToObjC-Swift.h file are generated.
In the SwiftToObjC-Bridging-Header.h file you add this line
#class Class1;
When you add Class2.swift and Class3.swift to the project, you also add these two classes to the SwiftToObjC-Bridging-Header.h file as follows.
#class Class1;
#class Class2;
#class Class3;


5. In the target SwiftToObjC, under Build Settings, Swift-Compiler General you should see these two settings:
Objective-C Bridging Header -> SwiftToObjC-Bridging-Header.h
Objective-C Generated Interface Header Name -> SwiftToObjC-Swift.h


6. In the target SwiftToObjC, under Build Settings, Define Module is set to YES.
If you want to access Class1 in say MyViewController, then in MyViewController.m, you should import.
#import "SwiftToObjC-Bridging-Header.h"
In your Class1.swift file, declare your class as “#objc public” as follows. The same #objc public is used for Class2 and Class3.

#objc public class Class1: UITableViewController
Note that: UITableViewController is only an example for demonstration purpose.
That’s all.