open the keybard app on iOS 26 without full access

Question

I am trying to open the keyboard app on iOS using the following method:

- (void)actionForGotoHostAppWithURL:(NSURL *)url {
 UIResponder *responder = self;
 do {
 if ([responder respondsToSelector:@selector(openURL:options:completionHandler:)] && [responder isKindOfClass:[UIApplication class]]) {
 [responder performSelector:@selector(openURL:options:completionHandler:) withObject:url withObject:nil];
 break;
 }
 } while ((responder = [responder nextResponder]) != nil);
} 

While this works with older iOS versions, I am getting the following error with iOS 26:

Error Domain=NSOSStatusErrorDomain Code=-54 "(null)" UserInfo={_LSFile=LSOpenOperation.mm, _LSLine=835, _LSFunction=_LSIsRequestAllowed}

What is the new method for doing that?

• HangarRash: 1. What URL are you using? 2. performSelection:withObject:withObject: only works with methods that take 2 arguments. You are trying to use it with a selector that takes 3 arguments. Call the method directly: [(UIApplication *)responder openURL:url options:0 completionHandler:nil];.
• matt: @HangarRash You cannot call openURL:options:completionHandler: directly on the application from an extension. That is evidently the restriction that the OP is trying to slide around.
• HangarRash: @matt There was no mention of the posted code being in an extension. If that's the case and calling openURL... directly isn't allowed, then using performSelector to call it shouldn't work either, right?
• matt: Actually openURL works if you locate the application as a responder by walking the responder chain. You see, I've been doing this stuff a long time, so I recognize the pattern in the OP code. See stackoverflow.com/questions/27506413/… if you're curious. That the question itself is very confusingly written, is obvious.
• 赵春浩: Yes, that's right. I am indeed using that method in a keyboard extension. Before iOS26 this approach was feasible — even if the user hadn't enabled Full Access, you could perform the jump that way. But the latest system seems to have tightened Full Access on keyboards, so calling it that way no longer works. I'm looking for other alternative solutions, because some apps have already implemented this kind of jump, so there should be some workable solution.