Call AppleScript class method from Objective-C class

[Matteo_999]

Hello,

as the title says, I need to call an AppleScript method from an Objective-C class. This is the Objective-C class:

#import <Cocoa/Cocoa.h>

@interface MSTabView : NSTabView

• (void)tabView:(NSTabView *)tabView willSelectTabViewItem:(NSTabViewItem *)tabViewItem;

@end

@implementation MSTabView

• (void)tabView:(NSTabView *)tabView willSelectTabViewItem:(NSTabViewItem *)tabViewItem {

  if ([[tabViewItem identifier] intValue] == 1) {

    //here I need to call another Applescript class method, or access its properties. I tried with:
  
    MSItems *msItems = [[MSItems alloc] init];
    [msItems.datePicker setMinDate:[...]];
  
    // or
  
    [msItems myMethod];
  

  }

}

@end

But I get the error Use of undeclared identifier ‘MSItems’. I even tried importing the MSItems class but nothing.
How can I do this?

Thanks!

[Shane_Stanley]

Add an interface for your class after the #import line:

@interface MSItems: NSObject

// declare your handlers here as methods, for example:

+ (void)myMethod;

@end

[Matteo_999]

And where do I define that method? Shall I create an implementation file?

[Shane_Stanley]

@Matteo_999

And where do I define that method?

In your AS file for class MSItems:

on myMethod()
-- whatever
end

[Matteo_999]

In this way the App fails to build and I get the error:

Undefined symbols for architecture x86_64: "_OBJC_CLASS_$_MSItems", referenced from: objc-class-ref in MSTabView.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)
I’ve read somewhere that this means something is missing.

[Shane_Stanley]

Sorry, you also need:

@class NSItems;

before the @interface.

In fact I tend to put it in the header file, along with a property that I then connect to a blue-cube instance of the class. Then I just call instance methods rather than class methods – I’ve found them more reliable anyway.

[Matteo_999]

Thanks, but I’m still getting that error…

Because in the Objective-C file +myMethod is declared as a class method, perhaps shall I define it in applescript in a different way? And in the applescript file as property parent shall I leave “NSObject”?

[Shane_Stanley]

You can make it an instance method (change the + to -). Or you can try referring to the class like this:

NSClassFromString(@"MSItems")

[Matteo_999]

Thanks Shane, it worked! I referred to the class In that way, leaving the method a class method!