swift - 无法调用非函数类型的值 'CGFloat'

Question

我是 sprite kit 2d 游戏开发的新手。现有的 swift2 项目运行良好，但不幸的是更新 swift4 后流动代码出现错误。我该如何解决这个问题

class SGScene : SKScene {
      override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for touch: AnyObject in touches {
            //let location = touch.locationInNode(self) //swift2
            let location = touch.location(self) //getting error update Xcode suggestion
            screenInteractionStarted(location)
        }
    }

       func screenInteractionStarted(_ location : CGPoint) {
            /*Overridden by Subclass*/
        }
}

目前我尝试更新这个项目 swift4

Answer 1

您缺少参数名称:in。替换这一行:

let location = touch.location(self)

与:

let location = touch.location(in: self)

它会起作用的。

全类同学:

import Foundation
import SpriteKit

class SGScene : SKScene {
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for touch in touches {
            let location = touch.location(in: self)
            screenInteractionStarted(location)
        }
    }

    func screenInteractionStarted(_ location : CGPoint) {
        /*Overridden by Subclass*/
    }
}