Can't see Swift variable/method in Objective C

Question

I am unable to see the method/variable to set myVar to true from Objective C even tough I've added the @objc and public modifiers and there is no Bool in the setMyVarTrue() method's signature.

This is probably caused by the difference between Swift's Bool and Objective C's BOOL.

Other class methods/variables are visible, just this particular one isn’t.

How is is possible to set Swift's Bool from Objective C?

Swift code:

public class MyViewController : UIViewController {
    public var myVar:Bool = false

    @objc public func setMyVarTrue() {
        self.myVar = true
    }
}

Objective C code:

MyViewController* myViewController = [MyViewController new];
myViewController.myVar = true // Variable not found
myViewController.setMyVarTrue() // Method not found
[self presentViewController:myViewController animated:NO completion:nil];

Have you imported the *modulename*-swift.h file? Are your property and method visible in that file? — Paulw11, Sep 11 '18 at 10:40
Import the swift file in your objective c project and then only its accessable from objective c — Nandhini, Sep 11 '18 at 10:48
In `objective-c` it will be `[myViewController setMyVarTrue];`. Welcome back to `objective-c` from `swift` — Cy-4AH, Sep 11 '18 at 10:55

score 0 · Answer 1 · answered Sep 11 '18 at 10:54

0

You should do

add @objc to declaration of your class
add a file named "yourName-swift.h", which should containt @class yourClass;
import "yourName-swift.h" in Objective C file, where you want to call

your swift class

answered Sep 11 '18 at 10:54

Bliss

565
4
12

score 0 · Accepted Answer · answered Sep 11 '18 at 11:37

The solution was to clean and rebuild the project. Xcode generates the swift bridging header automatically and in my case it was stopping the build process with a (variable/method not found) error prior to regenerating the bridging header.

SWIFT_CLASS("_TtC11MyProject25MyViewController")
@interface MyViewController : UIViewController
@property (nonatomic, strong) MBProgressHUD * _Nonnull progressIndicator;
- (nonnull instancetype)initWithNibName:(NSString * _Nullable)nibNameOrNil bundle:(NSBundle * _Nullable)nibBundleOrNil OBJC_DESIGNATED_INITIALIZER;
- (nullable instancetype)initWithCoder:(NSCoder * _Nonnull)aDecoder OBJC_DESIGNATED_INITIALIZER;
- (void)viewDidLoad;
- (void)viewWillAppear:(BOOL)animated;
- (void)submitProgressHandler:(NSNotification * _Nonnull)notification;
- (void)submitSuccessHandler;
- (void)submitFailureHandler:(NSNotification * _Nonnull)notification;
- (void)subscribe;
- (void)unsubscribe;
@end

Now it works fine:

SWIFT_CLASS("_TtC11MyProject25MyViewController")
@interface MyViewController : UIViewController
@property (nonatomic, strong) MBProgressHUD * _Nonnull progressIndicator;
@property (nonatomic) BOOL closing;
- (nonnull instancetype)initWithNibName:(NSString * _Nullable)nibNameOrNil bundle:(NSBundle * _Nullable)nibBundleOrNil OBJC_DESIGNATED_INITIALIZER;
- (nullable instancetype)initWithCoder:(NSCoder * _Nonnull)aDecoder OBJC_DESIGNATED_INITIALIZER;
- (void)viewDidLoad;
- (void)viewWillAppear:(BOOL)animated;
- (void)setClosingTrue;
- (void)submitProgressHandler:(NSNotification * _Nonnull)notification;
- (void)submitSuccessHandler;
- (void)submitFailureHandler:(NSNotification * _Nonnull)notification;
- (void)subscribe;
- (void)unsubscribe;
@end

Can't see Swift variable/method in Objective C

2 Answers2