Question

我在Swift中编写一个基于SpriteKit的游戏。 SKScene包含一个包含SKShapeNodes的SKSpriteNode。其中一个形状是＆＃34;播放器＆＃34;。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和触及结束。基本上一切正常，只要用户拖动＆＃34;播放器＆＃34;以正常速度。但是如果用户拖动＆＃34;播放器＆＃34; 非常快 touchesMoved方法通常不会被调用。我认为这可能是因为我使用SKShapeNodes但基于输出（如下）似乎没有是这样的。

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)

}

列印声明：

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

快速运动：

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。感谢。

Answer 1

你还没有发布你如何移动你的玩家，所以我假设你只是改变你的玩家位置。我建议您使用SKAction来移动播放器。

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)))
}

世界 - SKNode与SKScene
的尺寸完全相同

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

达尔维达斯指出我正确的方向，我能够解决这个问题：

问题不在于我移动玩家的方式就是这一行在touchesMoved：

if(self.player.containsPoint(touchLocation))

当用户移动得非常快时，touchLocation不在播放器内部（因为该位置无法快速更新）。我在声明中更改了条件，因此只检查播放器当前是否被拖动（或允许拖动）。

touchesBegan将bool设置为true表示玩家被触及
touchesMoved总是更新玩家位置（无论触摸发生在哪里）只要bool是真的
touchesEnded将bool设置为false

感谢。

SpriteKit - touchesMoved不经常调用 - 快速移动

2 个答案: