SpriteKit - touchesMoved 调用不够频繁 - 快速移动

Question

我正在 Swift 编写基于 SpriteKit 的游戏。 SKScene 包含一个 SKSpriteNode，它包含 SKShapeNodes。其中一种形状是 "player"。用户应该能够拖放播放器。我实现了不同的方法来让这个工作用户 touchesBegan、touchesMoved、touchesCanceled 和 touchesEnded。 基本上一切正常，只要用户以正常速度拖动 "player"。但是如果用户拖动 "player" 非常快 touchesMoved 方法 调用得不够频繁。 我想这可能是因为我使用 SKShapeNodes 但基于输出（下方）似乎并非如此。

代码：

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

let touchLocation = touches.first!.locationInNode(self)
if(self.player.containsPoint(touchLocation)){
    self.startedTouchingPlayer()
}
super.touchesBegan(touches, withEvent: event)
print("TOUCHES BEGAN")

}

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

let touchLocation = touches.first!.locationInNode(self)
if(self.player.containsPoint(touchLocation)){
    self.isTouchingPlayer(touchLocation)
    print("TOUCHES MOVED \(touchLocation)")
}
super.touchesMoved(touches, withEvent: event)

}

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

self.endedTouchingHelper()
super.touchesEnded(touches, withEvent: event)
print("TOUCHES ENDED")

}

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

print("TOUCHES CANCELED")
self.endedTouchingHelper()
super.touchesCancelled(touches, withEvent: event)

}

打印报表：

正常运动：

TOUCHES BEGAN
TOUCHES MOVED (-4.0, -241.499984741211)
TOUCHES MOVED (0.500015258789062, -239.0)
TOUCHES MOVED (4.0, -237.000015258789)
TOUCHES MOVED (11.0, -234.0)
TOUCHES MOVED (19.5, -229.499984741211)
TOUCHES MOVED (27.0000152587891, -225.499984741211)
TOUCHES MOVED (34.0, -221.499984741211)
TOUCHES MOVED (41.0, -217.499984741211)
TOUCHES MOVED (48.0, -213.499984741211)
TOUCHES MOVED (53.4999847412109, -210.0)
...
TOUCHES MOVED (77.5, -177.000015258789)
TOUCHES MOVED (77.5, -178.0)
TOUCHES ENDED

快速移动：

TOUCHES BEGAN
TOUCHES MOVED (6.5, -277.5)
TOUCHES MOVED (3.0, -261.000030517578)
[*** at this point the finger is at a different position as the "player" ***] TOUCHES ENDED

感谢任何形式的帮助。谢谢

Answer 1

你还没有发布你是如何移动你的球员的，所以我假设你只是改变了你的球员位置。我建议您使用 SKActions 来移动您的播放器。

func moveToPosition(oldPosition: CGPoint, newPosition: CGPoint) {

    let xDistance = fabs(oldPosition.x - newPosition.x)
    let yDistance = fabs(oldPosition.y - newPosition.y)
    let distance = sqrt(xDistance * xDistance + yDistance * yDistance)
    let sceneDiagonal = sqrt(world.frame.size.width * world.frame.size.width + world.frame.size.height * world.frame.size.height)

    self.runAction(SKAction.moveTo(newPosition, duration: Double(distance / sceneDiagonal / 2)))
}

world - SKNode of exactly same size as your SKScene

并像这样使用它： touchesMoved:

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

let touchLocation = touches.first!.locationInNode(self)
if(self.player.containsPoint(touchLocation)){
    moveToPosition(self.player.position, newPosition: touchLocation)
}

Answer 2

Darvydas 为我指明了正确的方向，我能够像这样解决问题：

问题不在于我移动播放器的方式，而是 touchesMoved 中的这一行：

if(self.player.containsPoint(touchLocation))

当用户移动得非常快时，touchLocation 不在播放器内部（因为位置无法快速更新）。我更改了语句中的条件，因此它只检查玩家当前是否正在被拖动（或允许被拖动）。

touchesBegan 将布尔值设置为 true 以指示玩家被触摸
只要 bool 为真，touchesMoved 总是会更新玩家位置（无论触摸发生在何处）
touchesEnded 将布尔值设置为 false

谢谢。

SpriteKit - touchesMoved 调用不够频繁 - 快速移动

SpriteKit - touchesMoved not called often enough - fast movement

uitouch

touches

ios

sprite-kit

swift