可以在NSObject类的UIButton中添加Target吗？

Question

How do you addTarget to a UIButton in an NSObject class? Or will that class not work?

class Support: NSObject {

    func helpButton(viewController: ProfileVC) {

    let helpButton = viewController.helpButton
    helpButton.frame.size = CGSizeMake(35.0, 35.0)
    helpButton.layer.cornerRadius = helpButton.frame.height/2
    helpButton.layer.borderWidth = 0.5
    helpButton.layer.borderColor = lightColoredFont.CGColor
    helpButton.setTitle("?", forState: .Normal)
    helpButton.setTitleColor(lightColoredFont, forState: .Normal)
    helpButton.titleLabel?.font = fontSmaller
    helpButton.addTarget(self, action: Selector("showOptions"), forControlEvents: .TouchUpInside)
    helpButton.center.y = viewController.logoutButton.center.y
    helpButton.frame.origin.x = (viewController.view.bounds.width - viewController.logoutButton.frame.maxX)
    viewController.view.addSubview(helpButton)

    }

    func showOptions() {

        print("showing")

    }

}

The print is not showing. Even if I feed an instantiated support class into the target for the button it will not work. What is the proper way to do this?

Answer 1

In short, no.

NSObject does not inherit from anything in UIKit. Your inheritance should be the other way around. Perhaps you could make a UIButton that has a property of type NSObject to carry some accompanying information?

Answer 2

Look at the UIControl API

func addTarget(_ target: AnyObject?, action action: Selector, forControlEvents controlEvents: UIControlEvents)

But what are you trying to do? Normally you would add a button in interface builder and a reference (IBOutlet) to that button from some controller class like UIViewController.

edit

Ah, now I see the problem. Don't use Selector in swift. This should work.

helpButton.addTarget(self, action: "showOptions", forControlEvents: .TouchUpInside)