无法调用非函数类型'CGFloat'的值

Question

我是Sprite Kit 2D游戏开发的新手。这是现有的Swift2项目运行良好，但不幸的是，在更新Swift4流动代码后，它会出错。我如何解决这个

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，我尝试更新此项目Swift4

Answer 1

您缺少参数名称：in。重复这一行：

let location = touch.location(self)

with：

let location = touch.location(in: self)

它将起作用。

整个班级：

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*/
    }
}

Answer 2

用以下方式替换您的方法：

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