ios - 添加目标时出现 Swift 错误

Question

这是我的代码。每次我点击 addButton 时，都会收到一个无法识别的选择器发送到实例崩溃/错误。我在过去的一个小时里一直在寻找答案，但找不到。请帮忙。

@IBOutlet var addButton: UIButton!
@IBOutlet var resetButton: UIButton!

var number:Int = 0

override func viewDidLoad() {
    super.viewDidLoad()

    let size: CGSize = self.view.frame.size;

    countLabel.frame = CGRect(x: 0, y:0, width: size.width, height: size.height/4)
    minusButton.frame = CGRect(x:0, y: size.height/4, width: size.width/2, height: size.height/8);
    addButton.frame = CGRect(x:0, y:size.height/4 + size.height/8, width: size.width, height: 5*size.height/8)
    resetButton.frame = CGRect(x:size.width/2, y: size.height/4, width: size.width/2 ,height: size.height/8)

    addButton.addTarget(self, action: #selector(addNumber(sender:)), for: UIControlEvents.touchUpInside)
    minusButton.addTarget(self, action: #selector(minusNumber), for: UIControlEvents.touchUpInside)
    resetButton.addTarget(self, action: #selector(resetNumber), for: UIControlEvents.touchUpInside)

}

func addNumber(sender: UIButton!) {
    number = number + 1
    countLabel.text = String(number)
}

Answer 1

改变

addButton.addTarget(self, action: #selector(addNumber(sender:)), for: UIControlEvents.touchUpInside)

与

addButton.addTarget(self, action: #selector(addNumber), for: UIControlEvents.touchUpInside)