Swift protocol called in Objective-C not working and application crashes with error message "unrecognized selector" - objective-c

Question

I am trying to get the Swift protocol to work in Objective-C file, but the application crashes when the error as below.
+[OpenCamera onCameraClose]: unrecognized selector sent to class 0x102ff8580
I am not sure as to what I am missing.
//Swift: UIViewController Code
#objc protocol CameraViewControllerDelegate {
func onCameraClose()
}
#objc class CameraViewController: UIViewController {
var delegate : CameraViewControllerDelegate? = nil
func closeCamera(sender: Any) {
delegate?.onCameraClose()
}
}
// Objective-C : UIViewController Code
OpenCamera.h
#interface OpenCamera : UIViewController <CameraViewControllerDelegate>
OpenCamera.m
#import <MyProjectName/MyProjectName-Swift.h>
#implementation OpenCamera
- (void)viewDidLoad {
[super viewDidLoad];
CameraViewController *cameraViewController = [[CameraViewController alloc] initWithNibName:#"CameraView" bundle:nil];
cameraViewController.delegate = self; //Warning - Incompatible pointer types assigning to 'id<CameraViewControllerDelegate> _Nullable' from 'Class'
}
- (void)onCameraClose {
NSLog(#"Swift Protocol method executed from Objective-C");
}
#end

Answer 1

The warning here did in fact predict the crash:
cameraViewController.delegate = self;
//Warning - Incompatible pointer types assigning to 'id<CameraViewControllerDelegate> _Nullable' from 'Class'
Clearly it thinks self is a class, not an instance. That's very odd.
My guess is that there is something wrong with your import arrangements, but you have not shown enough information to see what it is. I'll just show an arrangement that works.
Let's assume you have both Objective-C and Swift code in one target (i.e. that no frameworks are involved). Then in Swift, you say:
#objc protocol CameraViewControllerDelegate {
func onCameraClose()
}
class CameraViewController: UIViewController {
#objc var delegate : CameraViewControllerDelegate? = nil
func closeCamera(sender: Any) {
delegate?.onCameraClose()
}
}
Note the use of #objc var to expose the delegate property. There is no need to expose the class to Objective-C, as it is already an NSObject derivative.
Okay, in Objective-C, here is your interface file:
#import <UIKit/UIKit.h>
#interface OpenCamera : UIViewController
#end
Note that you do not import the generated header in a .h file, and you do not attempt to mention an imported protocol here.
On to the implementation file:
#import "OpenCamera.h"
#import "MyProject-Swift.h"
#interface OpenCamera () <CameraViewControllerDelegate>
#end
#implementation OpenCamera
- (void)viewDidLoad {
[super viewDidLoad];
CameraViewController *cameraViewController = [[CameraViewController alloc] initWithNibName:#"CameraView" bundle:nil];
cameraViewController.delegate = self;
}
- (void)onCameraClose {
NSLog(#"Swift Protocol method executed from Objective-C");
}
#end
We import the corresponding .h file and the generated header .h file here. We use an anonymous category to declare conformance to the protocol, and the rest is as you have it. You won't see any warnings.