无法在 Swift 游乐场中向 SKScene 添加滑动识别器?
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【中文标题】无法在 Swift 游乐场中向 SKScene 添加滑动识别器?【英文标题】:Unable to add swipe recognizer to SKScene in Swift playground? 【发布时间】:2017-03-18 23:14:41 【问题描述】:好的,我对 Swift Playground 的工作方式还有些陌生,但我正在尝试将 Swift 3 中的滑动手势识别器添加到我的 Swift Playground 中。关注这个http://www.spritekitlessons.com/gesture-recognizer-with-sprite-kit-and-swift/我现在有:
func swipedRight(sender:UISwipeGestureRecognizer)
print("swiped right")
func swipedLeft(sender:UISwipeGestureRecognizer)
print("swiped left")
func swipedUp(sender:UISwipeGestureRecognizer)
print("swiped up")
func swipedDown(sender:UISwipeGestureRecognizer)
print("swiped down")
let degree = CGFloat(M_PI_2) / 90
class GameScene: SKScene
var selectedNode: SKNode?
var shakeAction: SKAction?
override func didMove(to view: SKView)
/* Setup your scene here */
let swipeRight:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector(("swipedRight:")))
swipeRight.direction = .right
view.addGestureRecognizer(swipeRight)
let swipeLeft:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector(("swipedLeft:")))
swipeLeft.direction = .left
view.addGestureRecognizer(swipeLeft)
let swipeUp:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector(("swipedUp:")))
swipeUp.direction = .up
view.addGestureRecognizer(swipeUp)
let swipeDown:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector(("swipedDown:")))
swipeDown.direction = .down
view.addGestureRecognizer(swipeDown)
let frame = CGRect(x: 0, y: 0, width: 1000, height: 600) //view size
let view = SKView(frame: frame)
let scene = GameScene(size: frame.size)
view.presentScene(scene)
PlaygroundPage.current.liveView = view
这可以编译,但是当我滑动时,我得到一个无法识别的选择器错误,即使我确实在选择器中包含了函数:
我也尝试将函数放在类中。如何向 Swift Playground SKScene 添加滑动识别器?
【问题讨论】:
【参考方案1】:您将选择器作为字符串传递,如错误日志中所述,它们肯定有问题
尝试使用新的选择器语法 - #selector(methodName)
。
例子:
class ViewController: UIViewController
override func viewDidLoad()
super.viewDidLoad()
/* Swift 3 */
let swipe = UISwipeGestureRecognizer(target: self, action:#selector(handleSwipe))
view.addGestureRecognizer(swipe)
func handleSwipe()
print("Swiped!")
不推荐使用字符串作为选择器。
如果methodName()
方法不存在,则使用新的选择器语法,您将收到编译错误——您的应用不会因为“无法识别的选择器”而崩溃。
【讨论】:
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