如何在UITableViewController中引用自定义UIView的子视图按钮

Question

I'm facing problems with UITableViewCell being reused, and I am receiving suggestions to make the action of a UIButton occur within the UITableViewController. The problem is that because the UIButton is instantiated within the custom UIView subclass, I cannot find a way to refer to it.

The code is:

class StarButton: UIView {

var buttonRow : Int = 0
var buttonSelected : Bool = false

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

required init?(coder aDecoder: NSCoder){
    super.init(coder: aDecoder)
    initStar()
}

func initStar(){

    let filledStarImage = UIImage(named: "filledStar")
    let emptyStarImage = UIImage(named: "emptyStar")

    let button = UIButton(frame: CGRect(x: 2, y: 2, width: 33, height: 33))

    button.userInteractionEnabled = true
    button.addTarget(self, action: #selector(StarButton.fillingStar(_:)), forControlEvents: UIControlEvents.TouchUpInside)

    button.setImage(emptyStarImage, forState: .Normal)
    button.setImage(filledStarImage, forState: .Selected)

    if buttonSelected == true{
        button.selected = true
    }

    addSubview(button)
}

//Could have various errors
func fillingStar(sender: UIButton){
    if (sender.selected) == false{
        FavoritesManager.favoritesList.setObject(ChemQuizCollection.wordListObject.quizList[buttonRow], forKey: "\(buttonRow)")
        sender.selected = !sender.selected
        FavoritesManager.favoritesList.synchronize()
    } else{
        FavoritesManager.favoritesList.removeObjectForKey("\(buttonRow)")
        sender.selected = !sender.selected
        FavoritesManager.favoritesList.synchronize()
    }

}

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?)
{
    for view in subviews
    {
        view.touchesBegan(touches, withEvent: event)
    }
}

override func pointInside(point: CGPoint, withEvent event: UIEvent?) -> Bool
{
    return true
}

}

This is the custom UIView subclass. I want to refer to the "button" in func initStar(). Using for subview in instantiatedStarButton.subviews{ subview.selected = true } throws an error saying UIView doesn't have member "selected". Is there a better way?

Thank you all in advance.

Answer 1

The problem is with your code

StarButton.subviews{ subview.selected = true }

.subviews give UIView not UIButton : UIView has no .selected property

What should be done is following code or something similar. You have to cast tour UIView to UIButton

let filtured  =  instantiatedStarButton.subviews.filter({
            if let button = $0 as? UIButton{
                return button.selected
            }
            return false
        })

Answer 2

buttonSelected is set to false while you are only changing the state of the button if its true. That's why you're getting the error.

You can either change the buttonSelected to true, or even better assign a tag to the button and compare that tag with the 'sender' in fillingStar.