IosViewController not reacting when adding key command

Question

Magnesium OP

Created 2d

Replies 1

Boosts 0

Participants 2

@interface CallbackClass : NSObject

(void) doSomething:(UIKeyCommand*)keycmd;
(UIKeyCommand*) returnKeyCommand;

@end

@implementation CallbackClass

(void) doSomething:(UIKeyCommand*)keycmd { NSLog(@"KEY CLICKED");

} -(UIKeyCommand*) returnKeyCommand { return [UIKeyCommand keyCommandWithInput:@"a" modifierFlags:0 action:@selector(doSomething:)]; } @end

void CppClass::bindKeyCommand() { CallbackClass* callbackClass = [[CallbackClass alloc] init];

[[UIApplication sharedApplication].keyWindow.rootViewController]
               addKeyCommand:[callbackClass returnKeyCommand]];

}

This is objective-c code that is injected into QT application with C++ and Cmake. Responder chain after executing this code:

<QUIView> <QIOSDesktopManagerView> <QIOSViewController> key commands: <UIKeyCommand: 0x12....> -> Title: Action: doSomething: Input: @"a" ...

Even if this key command is present is in the responder chain i dont have any reaction on click on magic keyboard. When i do this in the pure objective-c but not with with QT, C++, Cmake project.

I Detect key input but only when i add my custom view controller do the subview of QIOSViewController, but then i cany click anything else on my application then.

I want to be able to detect key input or somehow inject a responder into responder chain and still being able to click things on my application.

Boost

Answer 1

Frameworks Engineer OP

Apple

2d

There needs to be a UIResponder (e.g. a UIView, UIViewController, etc.) in the responder chain that responds to the -doSomething: action. So it's not enough to have your key command in the responder chain. From what I'm seeing, your CallbackClass can provide a key command, and while it does respond to the -doSomething: action, it is not in the responder chain (nor can it be in the chain, as it is not a UIResponder).

I would recommend having one of your existing views/view controllers implement the -doSomething: action. Alternatively, if you want this key command to be performable at any level of the app, you can have UIApplication or your AppDelegate respond to the action.

0