UIButton not firing its Target Selector - ios

Question

I have a UIButton that I am placing on a different UIView than the one it is declared in but I want the Target Selector to be in the UIView I declared the button in. The init_button function is getting called because the button is being placed on the view. Here is what I have:
import Foundation
import UIKit
class Menu1 : Element {
var color_base = #colorLiteral(red: 0.8039215803, green: 0.8039215803, blue: 0.8039215803, alpha: 1)
var mock : UIView = UIView()
var button : UIButton = UIButton()
var view_width: CGFloat = 0,
view_height: CGFloat = 0,
menu_vertical_buffer : CGFloat = 0,
menu_width : CGFloat = 0,
button_vertical_buffer : CGFloat = 0,
button_width : CGFloat = 0
required init(mock: UIView) {
super.init(mock: mock)
self.mock = mock
init_dims()
init_button()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func init_dims(){
view_width = mock.frame.width
view_height = mock.frame.height
menu_vertical_buffer = CGFloat(floor(Double(view_height/17.5)))
menu_width = CGFloat(floor(Double(view_width/2.67)))
button_vertical_buffer = CGFloat(floor(Double(menu_vertical_buffer/3.6)))
button_width = menu_width - CGFloat(floor(Double(menu_width/7)))
}
func init_button(){
button = UIButton(frame: CGRect(x: mock.frame.width - menu_width,
y: mock.frame.height - (menu_vertical_buffer + (2 * button_vertical_buffer)),
width: button_width,
height: menu_vertical_buffer))
button.backgroundColor = color_base
button.layer.cornerRadius = button.frame.height/2
button.addTarget(self, action: #selector(changeMenuState), for: .touchUpInside)
mock.addSubview(button)
}
dynamic func changeMenuState(){
print("Menu state changed")
}
}
changeMenuState is the function I am adding as the target selector but the button is in the view mock not in the view that these functions are in.

Answer 1

changeMenuState must be dynamic or #objc exposed like
#objc func changeMenuState(){
print("Menu state changed")
}

Answer 2

My best guess is this might be a scoping issue. You aren't showing where the button is stored or the lifetime of the scope. In a typical scenario, you would define a button in a viewcontroller (or perhaps a cell) like so:
class MyViewController: UIViewController {
var button: UIButton? = nil
override func viewDidLoad() {
super.viewDidLoad()
init_button()
}
}
This way the button stays in scope as long as the view controller is within scope. Your code looks valid so my "best guess" is the references to button are going out of scope.
You probably need to provide more insight on how these views are working together and the scope of their lifetime (if this comment doesn't help you).

Answer 3

Did you set button's frame corretly? You can set mock's clipsToBounds to YES, then observe.
update：
As #Badhan Ganesh comment ,you can see the view stack.

Answer 4

The code you have written is correct and I have given the try on same. The issue I found is that your button is appearing on screen but placed out of bound of mock view, hence button is unable to receive the touch event on it. Try to place button inside mock view bounds by setting the frame correctly.

Answer 5

I was able to solve the problem and it was a scoping issue. I never added the Menu1 class to the mock class or any other view so I believe after it was instantiated and the button placed, that instance was killed so the button was placed but the target was in a class that was no longer in use. what solved my problem was adding mock.addSubview(self) to this class.