UIContextMenuInteraction for UIControl [duplicate] - ios

Question

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iOS 14 Context Menu from UIView (Not from UIButton or UIBarButtonItem)
(2 answers)
Closed 1 year ago.
I know UIButton has a menu property so that context menus can be added to the button. But for other UIControl subclasses, such as custom UIControls, this property does not exist.
I know that one way of adding a context menu to a UIControl is to call addInteraction and then adopt the delegate for the context menu. But then if I have multiple controls on the page, how do I add the menus for all the different controls since they all share the same delegate?
Alternatively, how could I add a menu property to my UIControl subclass? I know that UIControl has a property called contextMenuInteraction and that is apparently automatically populated, but I do not understand how to use that property. I know the control has to implement the delegate method (UIContextMenuConfiguration *)contextMenuInteraction:(UIContextMenuInteraction *)interaction configurationForMenuAtLocation:(CGPoint)location, but then inside that method, do I just construct the UIContextMenuInteraction object? And when the menu property is set, how do I get it to call the delegate method?
Essentially I would like to be able to imitate the UIButton class's menu property in my UIControl subclass. But if not that, then I would like to at least figure out how to support multiple context menus all sharing the same delegate.

Answer 1

You can create and add a new UIContextMenuInteraction object to views (or controls, etc) in the same way you add a new gesture recognizer.
Then, in your menu action handler, you can get the view that was long-pressed to show the menu via the .sender:
UIAction *someAction = [UIAction actionWithTitle:#"Some Menu Option"
image:nil
identifier:nil
handler:^(__kindof UIAction* _Nonnull action) {
// get the view that presented the context menu
UIView *v = ((UIContextMenuInteraction *)(action.sender)).view;
// do something
}];
So, if I have a custom UIControl called MySwitch, and I want to add 7 of them to a stack view, giving each a context menu, I could do something like this:
for (int i = 1; i < 8; i++) {
MySwitch *v = [MySwitch new];
[v setTitle:[NSString stringWithFormat:#"Switch: %d", i]];
[v.heightAnchor constraintEqualToConstant:60.0].active = YES;
UIContextMenuInteraction *interaction = [[UIContextMenuInteraction alloc] initWithDelegate:self];
[v addInteraction:interaction];
[stack addArrangedSubview:v];
}