Question

我有一个名为colorChangerViewClass的自定义类，它继承自UIView：

class colorChangerViewClass: UIView {


@IBOutlet weak var controller: ViewController!

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    // I want to change a textLabel in the main ViewController based on the current finger position here!
    }

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
    // And here aswell!
}

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) { ... }


func setColor(color: UIColor) {
    self.backgroundColor = color
}

}

在touchesBegan和touchesMoved方法中，我想根据当前手指位置更改主ViewController中的textLabel（另一个）。

在两个班级colorChangerViewClass和ViewController之间建立沟通的最佳方式是什么？

Answer 1

您太靠近无法解决问题，您需要设置ViewController的{{1}}到controller属性的引用。也无需将colorChangerViewClass声明为出口，因此请更改下面的声明。

controller

现在var controller: ViewController?和touchesBegan使用此控制器访问touchesMoved

textLabel

现在，您正在创建override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) { self.controller?.textLabel.text = //set text } override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) { self.controller?.textLabel.text = //set text }对象的ViewController班级中设置colorChangerViewClass属性。

controller

注意：班级名称始终以大写字母开头，因此如果您将班级名称从@IOutlet var colorView: colorChangerViewClass! //set controller property in viewDidLoad colorView.controller = self更改为ColorChangerViewClass，则会更好。

Answer 2

在你的情况下，你正试图将孩子传达给父母，有几种方法可以让你获得所需的外出。

<强> 1.Delegation

<强> 2。通知

第3。将父实例对象传递给子代理（类似于委托）

我正在与代表进行演示，您可以将委托用作： -

<强> 1。声明在ColorChangerViewClass

旁边的某处声明协议

protocol ColorChangerViewClassDelegate:class {
    func fingerDidMoved()
    }

<强> 2。在ColorChangerViewClass中创建委托var

class ColorChangerViewClass: UIView {

        //declare delegate var

        weak var delegate:ColorChangerViewClassDelegate?

        @IBOutlet weak var controller: ViewController!

        override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
            // I want to change a textLabel in the main ViewController based on the current finger position here!
            self.notify()

        }

        override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {

            self.notify()
            // And here aswell!
        }

        override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {


        }

        func setColor(color: UIColor) {
            self.backgroundColor = color
        }

        func notify() {
            if let delegate = self.delegate {
                delegate.fingerDidMoved()
            }
        }

        }

第3。将视图的代理设置为控制器

class SomeVC:UIViewController,ColorChangerViewClassDelegate {

    var myLabel = UILabel()
        override func viewDidLoad() {
            super.viewDidLoad()

            //your view
            let theView = ColorChangerViewClass() // you might need auto layout or frame declared on your view to define view size
            theView.delegate = self
        }

        //MARK:-deleate method of view
        func fingerDidMoved() {
           // set text from here 
           self.myLabel.text = "Your text"
        }
    }

从其他视图更改视图textLabel

2 个答案: