Calling objective-c method from Swift error

Question

I get an error when I try to call objective-c method from swift. my objective-c .h class:

@class myType;
@interface myClass : NSObject
- (myType *)myMethod;

then I will create an object form myClass and try to call myMethod in swift (I have declared anObject of type myClass):

let a = anObject.myMethod();

but I get an error: Value of type 'myClass' has no member 'myMethod' If I change myType to something else, the error goes away. So it should be a problem of not recognizing myType in swift..

I appreciate any help

@class myType; is not sufficient, Swift needs to know the interface of that class. — Martin R
– Martin R, Commented Sep 13, 2016 at 18:46
The header file containing @interface myType .... @end must be included from the bridging header file. — Martin R
– Martin R, Commented Sep 13, 2016 at 18:49
Thanks... I added the myType header reference to my bridge class and it works. I will mark your answer as correct if you add it as an answer — Besat
– Besat, Commented Sep 13, 2016 at 18:56

Martin R · Accepted Answer · 2016-09-13 19:00:07Z

5

@class myType;

is only a "forward declaration" of that class. In order to call the

- (myType *)myMethod;

method from either Objective-C or Swift, the compiler needs to know the actual interface declaration of that class. So "myType.h" or whatever file contains

@interface myType : NSObject
// ...
@end

must be included from the bridging header file.

Remark: Class names should start with a capital letter.

answered Sep 13, 2016 at 19:00

Martin R

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Comments

Besat · Accepted Answer · 2016-09-14 13:23:49Z

0

turned out the real problem for me was something else! I had to simply delete the derived data:

Window -> Projects -> Derived Data -> Delete
Clean Project
Quit Xcode
Open Xcode
Build Project

Apparently, using swift I have to these steps more often..

answered Sep 14, 2016 at 13:23

Besat

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1 Comment

Max Over a year ago

Having the same problem, cleaned derived data, quit my xcode and still same error. In my case i can see in that my swift calls calling the objc method is present in the import module but still does not build : Value of type 'MyPrint' has no member 'createLayout'

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