Question

我对 swift 非常陌生。我使用multiple textfield and button创建了subview。我ViewController的输出如下： -

现在我需要删除"-"按钮，并在点击它时对应textfield。但是我无法检测到哪个按钮被点击了。这是我的代码：

var y: CGFloat = 190
var by: CGFloat = 192

 @IBAction func addRow(sender: AnyObject) {

    y += 30
    by += 30

    let textFiled = UITextField(frame:CGRectMake(50.0, y, 100.0, 20.0))

    textFiled.borderStyle = UITextBorderStyle.Line

    let dunamicButton = UIButton(frame:CGRectMake(155.0, by, 15.0, 15.0))
    dunamicButton.backgroundColor = UIColor.clearColor()
    dunamicButton.layer.cornerRadius = 5
    dunamicButton.layer.borderWidth = 1
    dunamicButton.layer.borderColor = UIColor.blackColor().CGColor
    dunamicButton.backgroundColor = .grayColor()
    dunamicButton.setTitle("-", forState: .Normal)
    dunamicButton.addTarget(self, action: #selector(removeRow), forControlEvents: .TouchUpInside)




    self.view.addSubview(textFiled)
    self.view.addSubview(dunamicButton)
}


func removeRow(sender: UIButton!) {
    print("Button tapped")
    self.view.removeFromSuperview()
}

任何帮助将不胜感激......

Answer 1

eMKA是对的！试试这个：

import UIKit

class ViewController: UIViewController {

    var y:CGFloat = 100
    var textFields = [UIButton : UITextField]()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    @IBAction func onAddMoreButtonPressed(sender: AnyObject) {
        let newButton = UIButton(frame: CGRect(x: 50, y: y, width: 150, height: 20))


        newButton.setTitle("New button", forState: .Normal)
        newButton.backgroundColor = UIColor.blueColor()
        newButton.addTarget(self, action: #selector(ViewController.onNewButtonPressed(_:)), forControlEvents: .TouchUpInside)

        self.view.addSubview(newButton)

        let newTextField = UITextField(frame: CGRect(x: 200, y: y, width: 150, height: 20))
        newTextField.text = "New text field"
        self.view.addSubview(newTextField)

        textFields[newButton] = newTextField

        y += 20
        if y > self.view.frame.height {
            y = 100
        }
    }

    func onNewButtonPressed(sender: UIButton) {
        textFields[sender]?.removeFromSuperview()
        sender.removeFromSuperview()
    }

}

Answer 2

您可以在任何视图控制器中覆盖方法touchesBegan。假设您正在某处存储按钮数组

let buttons : [UIButton] = []

您可以执行以下操作：

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {

    super.touchesBegan(touches, withEvent: event)

    guard let touch: UITouch = touches.first else {
        return
    }

    for button in buttons {
        if touch.view == button {
            print("This is the button you tapped")
            button.removeFromSuperview()
        }
    }

}

单击时如何删除按钮？

2 个答案: