Why is IBAction throwing exception?

Question

import UIKit

class LoginViewController: UIViewController {
    @IBAction func btnActionLogin(_ sender: Any?) {
        print("Why is this error?")
    }
}

After connecting the button to my view controller, when I tap the button, the app keeps crashing with an Error: (Thread 1: signal SIGABRT)

Why? I am just connecting the button from the storyboard to the code like normal..

Did you link your custom viewcontroller to the view in Interface Builder? — Cas Wolters, Apr 02 '18 at 18:02
@CasWolters I am not quite sure what do you mean coz I have set it to be the initial View Controller in the Storyboard. If I didnt get you wrong, I have added the the Class name to the controller in the storyboard Custom Class as LoginViewController — user3390652, Apr 02 '18 at 18:07
Show us the crash log, it has often (if not almost all the times) the correct hints about the error. — Larme, Apr 02 '18 at 18:09
@Larme I have found these.. Unknown class LoginViewController in Interface Builder file unrecognized selector sent to instance 0x7fccc4405e50 Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController btnActionLogin:]: unrecognized selector sent to instance 0x7fccc4405e50' — user3390652, Apr 02 '18 at 18:13
@Larme But I am confused with this log because I have already linked the class to the controller :( — user3390652, Apr 02 '18 at 18:13
From it: You didn't set correctly the class of the UIViewController to `LoginViewController` (your custom one) in the Storyboard — Larme, Apr 02 '18 at 18:14
Also make sure that no any other IBAction connected with that button action. — Mehul Sojitra, Apr 03 '18 at 06:02

score 2 · Accepted Answer · answered Apr 02 '18 at 18:17

2

Make sure the Module part is not None and set to your target name in addition to class set to Your custom class name

answered Apr 02 '18 at 18:17

Shehata Gamal

98,760
8
65
87

1

this is the problem. I have sorted it now. Thanks. But it is just strange coz it has always been there. All I have done is click on it and press enter again :/ – user3390652 Apr 02 '18 at 18:25
yes clicking enter on class name re assigns the module – Shehata Gamal Apr 02 '18 at 18:28

score 0 · Answer 2 · answered Apr 02 '18 at 18:14

0

Please look at this link : Swift error : signal SIGABRT how to solve it

and follow second answer. Suspecting you have connected another action or so and might have deleted it by mistake.

answered Apr 02 '18 at 18:14

Mridul Gupta

599
5
18

Why is IBAction throwing exception?

2 Answers2