Open a URL with an application ( Objective-C / Cocoa )

.m

    [[NSWorkspace sharedWorkspace] openURLs:@[url]
                       withApplicationAtURL:[NSURL fileURLWithPath:@"/Applications/Safari.app"]
                              configuration:nil
                          completionHandler:^(NSRunningApplication * _Nullable app, NSError * _Nullable error) {
        [app activateWithOptions:NSApplicationActivateIgnoringOtherApps];
    }];