Multi tool use

Unable to use Swift object's variables in Objective-C View Controller

I am facing a problem accessing variables of a class written in Swift from a view controller written in Objective-C.

I have already created the Bridging Header and I have successfully sent the Swift object from a view controller written in Swift to another one written in Objective-C. The problem is that I want to access the variables of the object but I get the following error: Property 'variableName' cannot be found in forward class object 'className'.

Here is the class which I am trying to access its variables:

import Foundation
import UIKit
import SwiftyJSON

@objcMembers
class SwiftObject: NSObject {

// MARK: - Variables
var id: String
var name: String
var contact: SwiftSubObjectA
var location: SwiftSubObjectB
var categories: [SwiftSubObjectC] =

// MARK: - Initializers
init(withJSON json: JSON) {
self.id = json["id"].stringValue
self.name = json["name"].stringValue
self.contact = SwiftSubObjectA(withJSON: json["contact"])
self.location = SwiftSubObjectB(withJSON: json["location"])

for categoryJSON in json["categories"].arrayValue {
categories.append(SwiftSubObjectC(withJSON: categoryJSON))
}

}

}


And this is how I am sending the object into the Objective-C view controller

class SwiftViewController: UIViewController {

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
guard let objectiveVC.object = segue.destination as? ObjectiveViewController else { return }
guard let object = sender as? SwiftObject else { return }
objectiveVC.object = object
}

}


Finally, this is the Objective-C view controller .h file:

#import <UIKit/UIKit.h>
@class SwiftObject;

@interface ObjectiveViewController : UIViewController

@property (strong, nonatomic) SwiftObject * _Nonnull object;

@end


and the .m file:

#import "ObjectiveViewController.h"
#import "Project-Bridging-Header.h"

@interface ObjectiveViewController ()

@end

@implementation ObjectiveViewController

- (void)viewDidLoad {
[super viewDidLoad];
NSLog(@"%@", self.object.name);
// Do any additional setup after loading the view.
}

@end


The problem is that the self.object does not have any available variables to be used.

1 Answer
1

In order to access Swift object in your Objective-C Class you need to import Project-Swift.hin your .m file as shown below

Project-Swift.h

#import "Project-Swift.h"

@implementation ObjectiveViewController

//... other code

@end


Project is the name of the project. Add the import statement in your ObjectiveViewController.m file

ObjectiveViewController.m

Hope this helps

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