ios - 通过触摸来回移动物体

Question

我需要通过用户触摸在屏幕上左右移动对象。我已经使对象随着用户触摸而移动，但我想让对象或图像只能向右或向左移动。我应该使用什么代码来执行此操作？这是我现在拥有的。

import UIKit

class ViewController: UIViewController {

    @IBOutlet var Person: UIImageView!
    var location = CGPoint (x: 0, y: 0)

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

        let touch : UITouch! = touches.first! as UITouch

        location = touch!.locationInView(self.view)

        Person.center = location

    }

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

        let touch : UITouch! = touches.first! as UITouch

        location = touch!.locationInView(self.view)

        Person.center = location
    }



    override func viewDidLoad() {
        super.viewDidLoad()
    Person.center = CGPointMake(160, 330)

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

Answer 1

这应该有效。您可以更改 y 来更改您希望 UIImageView 始终保持打开状态的方式，但请确保两者相同!至少，这应该给你一个想法或让你走上正确的方向。

import UIKit

class ViewController: UIViewController {

    @IBOutlet var Person: UIImageView!

    var location = CGPoint(x: 0, y: 0)

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

        let touch : UITouch! = touches.first! as UITouch

        location = touch!.locationInView(self.view)

        let point = location.x

        Person.center = CGPoint(x: point, y: 160) // change 160 to set vertical height you desire

    }

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

        let touch : UITouch! = touches.first! as UITouch

        location = touch!.locationInView(self.view)

        let point = location.x

        Person.center = CGPoint(x: point, y: 160) // change 160 to set vertical height you desire
    }



    override func viewDidLoad() {
        super.viewDidLoad()

        Person.center = CGPointMake(160, 330)

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

我确信有更好的方法，但我仍然是初学者，所以......