Adding tap Gesture that call a function in another class

Adding tap Gesture that call a function in another class

I add a UITapGestureRecognizer to an element. I want that the function called after the tap gesture was recognized is in another Class.

UITapGestureRecognizer

This is my code :

let selectMoment = SelectMomentClass(countUserMoment: 1, cardView: self.cardView) selectMoment.draw() let gesture = UITapGestureRecognizer(target: self, action: #selector(selectMoment.selectMomentAction)) cardView.addGestureRecognizer(gesture)

and my SelectMomentClass contains my function:

SelectMomentClass

@objc func selectMomentAction(sender : UITapGestureRecognizer) print("card selectMoment is Tapped")

But when I run the code I have this error:

unrecognized selector sent to instance

Where does my code go wrong? This is the target parameter that I need to change. Can I called a function in another class?

I found a similar question in Objective-C but it does not help me.

I almost spoke abut responder chains and documentation about gesture recognizers not being part of the "normal" chain, but then I clicked on the link you posted and see you haven't post anything related to this part of the answer. (It may not help you, but will help us to help you.) "But you need the instance of the target class (class in which method is going to execute) as delegate or something in the gesture adding class." Is SelectMomentClass a delegate of the class that has the tap recognizer? If so, look into the responder chain - what you can do for UIGestureRecognizer.
– dfd
39 mins ago

SelectMomentClass

UIGestureRecognizer

@dfd Thanks for the comment, I resolved my problem to declare my SelectMomentClass like a instance variable
– El-Burritos
30 mins ago

SelectMomentClass

2 Answers
2

Since the object is a local variable it's deallocated after functions ends so make it an instance variable inside it's class

let selectMoment = SelectMomentClass(countUserMoment: 1, cardView: self.cardView)

Thanks for your reply, this fix the error message but dont give the message "card selectMoment is Tapped" so I think the function was again not called
– El-Burritos
1 hour ago

you have 2 objcets selectMoment and selectPicture which one do you want ??
– Sh_Khan
1 hour ago

Yes I edit the post I have only one object selectMoment
– El-Burritos
1 hour ago

cardView is UIView or UIImageView ??
– Sh_Khan
1 hour ago

UIView so isUserInteractionEnabled is set to true and the error would not be appear if the card have a problem of subview or other..
– El-Burritos
1 hour ago

isUserInteractionEnabled

Use this.Your method is defined in selectMomentClass class then you must add target
as selectMomentClass object and selecter as #selector(selectMoment.SelectPictureAction).

selectMomentClass

#selector(selectMoment.SelectPictureAction)

let selectMoment = SelectMomentClass(countUserMoment: 1, cardView: self.cardView) let gesture = UITapGestureRecognizer(target: selectMoment, action: #selector(selectMoment.SelectPictureAction(_:)))

Method Signature as below in the selectMomentClass.

@objc func selectMomentAction(_ sender : UITapGestureRecognizer) print("card selectMoment is Tapped")

Same to the Sh_Khan, this solve my error log but don't called the function ...
– El-Burritos
1 hour ago

In have edited my ans. plz check this.
– vivekDas
59 mins ago

thanks, but same issue... this is strange, I don't have any log
– El-Burritos
56 mins ago

in which class you are creating this SelectMomentClass object ?
– vivekDas
54 mins ago

in class CardCell : UITableViewCell
– El-Burritos
53 mins ago

class CardCell : UITableViewCell

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