我正在努力使用以下代码：
backgroundTimer = NSTimer.scheduledTimerWithTimeInterval(3, target: gvc, selector: #selector(GameViewController.addNext), userInfo: nil, repeats: true)
我似乎无法让#selector工作。此代码的结果是：
Type 'GameViewController' has no member 'addNext'
即使会员就在那里......这是完整的代码：
class GameViewController: GAITrackedViewController, AVAudioPlayerDelegate {
var sceneCanvas: SKSpriteNode?
override func viewDidLoad() {
skView.presentScene(WelcomeScene(size: view.bounds.size, gvc: self))
}
func createBackground(boundsSize: CGRect, gvc: GameViewController) -> SKSpriteNode {
addUILabels(gvc)
return sceneCanvas!
}
func addUILabels(gvc: GameViewController) {
backgroundTimer = NSTimer.scheduledTimerWithTimeInterval(3, target: gvc, selector: #selector(GameViewController.addNext), userInfo: nil, repeats: true)
}
public func addNext() {
let backgroundLabel = SKSpriteNode(imageNamed: "label1.png")
sceneCanvas!.addChild(backgroundLabel!)
backgroundLabel?.runAction(SKAction.moveByX(-screenSize.width , y: 0, duration: 12))
}
}
class WelcomeScene: SKScene {
init(size: CGSize, gvc: GameViewController){
super.init ()
let bounds = CGRect(origin: CGPoint(x: 0,y: 0), size: size)
sceneCanvas = createBackground(bounds, gvc: gvc)
self.addChild(sceneCanvas!)
}
}
我遇到了这个问题 UILongPressGestureRecognizer 和斯威夫特3。
我在扩展中使用我的方法长按表格视图单元格：
// Long press table view extension
extension MyViewController: UIGestureRecognizerDelegate {
public func handleLongPress(longPressGesture: UILongPressGestureRecognizer) {
let p = longPressGesture.location(in: self.tableView)
let indexPath = self.tableView.indexPathForRow(at: p)
if indexPath == nil {
print("Long press on table view, not row.")
}
else if (longPressGesture.state == UIGestureRecognizerState.began) {
print("Long press on row, at \(indexPath!.row)")
}
}
}
然后，在我的 viewDidLoad()：
// Configure long press on tableviewcell
let longPressGesture:UILongPressGestureRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(MyViewController.handleLongPress))
longPressGesture.minimumPressDuration = 1.0 // 1 second press
longPressGesture.delegate = self
self.tableView.addGestureRecognizer(longPressGesture)
对我来说，通过对选择器使用此语法来解决此问题：
action: #selector(MyViewController.handleLongPress)
没有运气，我尝试了以下替代方案。 这些都行不通：
action: #selector(self.handleLongPress)
action: #selector(MyViewController.handleLongPress(_:))
action: #selector(self.handleLongPress(_:))
action: #selector("handleLongPress(_:)")
另外，即使我似乎没有传递任何参数 MyViewController.handleLongPress，在长按选择时，所选行打印到控制台就好了：
Long press on row, at 5
backgroundTimer = NSTimer.scheduledTimerWithTimeInterval(3, target: self, selector: Selector("addNext"), userInfo: nil, repeats: true)
可能你的代码在不同的模块中。如果是这样你应该做你的 func addNext() 上市：
public func addNext() {
...
}
你试过这个吗？
backgroundTimer = NSTimer.scheduledTimerWithTimeInterval(3, target: self, selector: #selector(GameViewController.addNext), userInfo: nil, repeats: true)
要么
backgroundTimer = NSTimer.scheduledTimerWithTimeInterval(3, target: gvc, selector: #selector(gvc.addNext), userInfo: nil, repeats: true)
事实证明，问题是两件事。 1）我已经在类之外定义了方法，2）但是它还需要以下语法：
selector: #selector(addNext as () -> ())