SKSpriteNode drag movement by touch
问题 I'm trying to drag a SKSpirteNode around the screen by touching the screen. But I want to be able to do a constant movement of the Sprite, currently my code only moves the sprite to the location of my touch but if I hold and move the sprite will not follow. Moreover I don't want to "have" to touch the SKSpriteNode to activate the movement, I want to touch anywhere on the screen and to have a movement response from that SKSpriteNode. Here is my current code: class GameScene: SKScene { override