请检查下面的代码。我在主视图上制作了按钮。但是该按钮不调用"thumbsUpButtonPressed"方法。请检查一下!
override func viewDidLoad() {
super.viewDidLoad()
let button = UIButton(type: .custom)
button.frame = CGRect(x: 60, y: 100, width: 50, height: 50)
button.backgroundColor = .red //.clear
button.layer.cornerRadius = 5
button.layer.borderWidth = 1
button.layer.borderColor = UIColor.black.cgColor
button.clipsToBounds = true
//button.setImage(UIImage(named:"thumbsUp.png"), for: .normal)
button.addTarget(self, action: #selector(thumbsUpButtonPressed), for: .touchDown)
view.addSubview(button)
}
func thumbsUpButtonPressed(sender: UIButton) {
print("thumbs up button pressed")
}
如果要
将按钮作为参数传入,则必须在选择器中指定。为此,请在方法名称后添加(_:)
。
尝试:
button.addTarget(self, action: #selector(thumbsUpButtonPressed(_:)), for: .touchDown)
如果您希望它与现有代码一起使用,则需要更改方法以不接受按钮作为参数,如下所示:
func thumbsUpButtonPressed() {
print("thumbs up button pressed")
}