Swift: Are addTarget actions only allowing class methods?

Question

I tried to add a target to a UIButton and stumbled upon a weird behaviour

if i try:

//h = a collection view header

switch myVar {

case "none":
    h.button.addTarget(self, action: "buttonTapped:", forControlEvents: .TouchUpInside)

    func buttonTapped(sender:AnyObject) {

    sendFriendRequest(self.targetUser,nil
    } 

}

I get SIGABRT - with "selector not found"

but if I move the function out of the switch case and make it a method of my ViewController, everything works as expected.

Anyone has an explanation for that? Is is just not allowed or are there technical reasons?

you only need to make a method of your view controller. because the target is self! which means look for this method in the current class. otherwise specify the object that declares this method. — Omar Al-Shammary, May 27 '15 at 21:16

score 2 · Accepted Answer · answered May 27 '15 at 21:23

2

Selectors don't need to be class functions, but they must visible to the object call the selector (i.e. can't be marked as private or inside a method).

answered May 27 '15 at 21:23

InkGolem

2,662
1
15
22

score 0 · Answer 2 · edited May 23 '17 at 12:14

0

You can call any method in the project by using other class's instance instead of self.

Check this answer for the details. https://stackoverflow.com/a/33068386/2125010

edited May 23 '17 at 12:14

Community

1
1

answered Oct 11 '15 at 18:21

fatihyildizhan

8,614
7
64
88

Swift: Are addTarget actions only allowing class methods?

2 Answers2