swift - 如何在父 View Controller 中为动态创建的按钮创建处理程序？

Question

我从 ViewController 创建了一个 subview 。在 subview 中，创建了多个按钮。当点击任何创建的按钮时，我想调用父 View Controller 中的函数buttonTapped()。

class ViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()

    var bestTeamEver = SFGiants(frame: CGRect(x: 0, y: 100, width: view.bounds.width, height: 40))
    view.addSubview(bestTeamEver)

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}


func buttonTapped(){

    NSLog("BUTTON INSIDE SFGIANTS TAPPPED")

    }
}


class SFGiants: UIView {

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

    for i in 0...10 {

        var new_x = i*44

        var button = UIButton(frame: CGRect(x: new_x, y: 0, width: 40, height: 40))
        button.backgroundColor = UIColor.orangeColor()

        // Call buttonTapped() in parent view controller
        button.addTarget(self, action: "buttonTapped:", forControlEvents: UIControlEvents.TouchDown)

        self.addSubview(button)

    }
}

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

}

Answer 1

您可以创建自定义 init 方法，并可以传递对父 viewController 的引用并将其设置为按钮目标。

init(frame: CGRect actionListener:UIViewController) {
    super.init(frame: frame)
 for i in 0...10 {

        var new_x = i*44

        var button = UIButton(frame: CGRect(x: new_x, y: 0, width: 40, height: 40))
        button.backgroundColor = UIColor.orangeColor()

        // Call buttonTapped() in parent view controller
        button.addTarget(actionListener, action: "buttonTapped:", forControlEvents: UIControlEvents.TouchDown)

        self.addSubview(button)

    }
}