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我在Xcode 6 Beta 6中使用Swift在SpriteKit中編寫代碼。在代碼中，當用戶移動它時，我需要一張圖片來跟隨手指。 touchesMoved的作品，但與故障。如果我慢慢地移動手指，一切都很好。如果我移動手指快速地從右向左移動，那麼一切都很好。如果我快速地從左向右移動手指，那麼圖片只會在手指上快速移動幾分之一秒。如果我在現在位置點擊並保持圖片大約半秒鐘，那麼當我從右向左或從左向右快速移動圖片時，一切都很順利。總之，我不能將圖片從左向右快速移動，除非我點擊並保持約半秒的圖片。任何人都知道爲什麼會發生這種情況？謝謝你的時間。以下是代碼。我正在移動SKSPriteNode follow2TouchesMoved在迅速滯後
override func touchesMoved(touches: NSSet, withEvent event: UIEvent) {
for touch: AnyObject in touches {
let angle_area_location = touch.locationInNode(self)
if self.nodeAtPoint(angle_area_location) == self.angle_area {
if (angle_area_location.x <= 21) {
angle = 1.55681122463001
distance12 = sqrt((angle_area_location.y - 30) * (angle_area_location.y - 30) + 1)
}
if (angle_area_location.y <= 31) {
angle = 0.0102037274939542
distance12 = sqrt((31 - 30) * (31 - 30) + (angle_area_location.x - 20) * (angle_area_location.x - 20))
}
if (angle_area_location.x > 21) && (angle_area_location.y > 31) {
angle = atan((angle_area_location.y - 30)/(angle_area_location.x - 20))
distance12 = sqrt((angle_area_location.y - 30) * (angle_area_location.y - 30) + (angle_area_location.x - 20) * (angle_area_location.x - 20))
}
if (distance12 <= maxFollow2) && (distance12 >= minFollow2) {
self.cannon.zRotation = angle
self.arc.zRotation = angle
if (angle_area_location.x > 21) || (angle_area_location.y > 31) {
follow2.position = CGPointMake(angle_area_location.x , angle_area_location.y)
}
if(angle_area_location.x <= 21) {
follow2.position = CGPointMake(21 , angle_area_location.y)
}
if (angle_area_location.y <= 31) {
follow2.position = CGPointMake(angle_area_location.x , 31)
}
}
if(distance12 > maxFollow2) {
self.cannon.zRotation = angle
self.arc.zRotation = angle
delta = 290/3
arc.size = CGSizeMake(160 * (1 + delta/20) , 35)
arc.position = CGPointMake(20 - 3 * (delta) * cos(angle) , 30 - 3 * (delta) * sin(angle))
followdist = 360
follow2.position = CGPointMake(angle_area_location.x , angle_area_location.y)
velocity = vmin + (followdist - minFollow2) * (300/(maxFollow2 - minFollow2))
}
if (distance12 < minFollow2) {
self.cannon.zRotation = angle
self.arc.zRotation = angle
arc.size = CGSizeMake(160 , 6.8)
arc.position = CGPointMake(20 , 30)
follow2.position = CGPointMake(minFollow2 * cos(angle) + 20 , minFollow2 * sin(angle) + 30)
followdist = sqrt((follow2.position.y - 30) * (follow2.position.y - 30) + (follow2.position.x - 20) * (follow2.position.x - 20))
velocity = vmin + (followdist - minFollow2) * (300/(maxFollow2 - minFollow2))
}
}
}
}