Unable to add target to UIButton

Question

I have a UIButton that I created programmatically. I have added a target to it, but it doesn't seem to be running properly. Here is my code (This is a custom class of UIView ):

override init(frame: CGRect) {
    super.init(frame: frame)

    print("targets:")
    print(clickButton.allTargets())
    clickButton.addTarget(self, action: #selector(self.clickPicture), for: .touchUpInside)
    print("targets:")
    print(clickButton.allTargets())

}

This is what prints as a result:

As you can see, adding a target to my button does not make a difference. Here is the clickPicture function:

func clickPicture() {

    print("clickpicture")

}

Again, this does not print. Does anybody know how to fix this error? Thanks!

Edit:

Definition for clickButton (in my custom class):

var clickButton = UIButton()

Other properties defined in the init :

clickButton.frame.size = CGSize(width: 100, height: 100)
clickButton.layer.cornerRadius = clickButton.frame.size.width / 2
clickButton.layer.borderColor = UIColor.white().cgColor
clickButton.layer.borderWidth = 2.5
clickButton.layer.backgroundColor = shadeColor.cgColor
clickButton.center.x = self.center.x
clickButton.center.y = self.frame.size.height - clickButton.frame.size.height// + 40
clickButton.addTarget(self, action: #selector(self.clickPicture), for: .touchUpInside)
self.addSubview(clickButton)

Answer 1

The button was not on top of the custom view when I instantiated it. I changed its position, and it worked fine.

Answer 2

You have to change this line

clickButton.addTarget(self, action: #selector(self.clickPicture), for: .touchUpInside)

to this

clickButton.addTarget(self, action: #selector(YourClassName.clickPicture), forControlEvents: UIControlEvents.TouchUpInside)

And the method should be

func clickPicture() {

    print("clickpicture")

}