swift - 如何在 Swift 中设置速度

Question

下面是 Sprite Kit 中的 Enemy 节点，在 Swift 中。我已经为节点设置了速度，但是当它产生时没有运动。 Xcode 没有给我任何错误，是不是我做错了什么？

class Enemy: SKSpriteNode {

    init(imageNamed: String) {

        let imageTexture = SKTexture(imageNamed: imageNamed)
        super.init(texture: imageTexture, color: nil, size: imageTexture.size())

        self.name = "Enemy"

        self.physicsBody = SKPhysicsBody(rectangleOfSize: imageTexture.size())
        self.physicsBody?.dynamic = false
        self.physicsBody?.velocity = CGVectorMake(10.0,10.0)

    }
}

Answer 1

来自 Apple 的 SpriteKit documentation :

A Boolean value that indicates whether the physics body is moved by the physics simulation.

Declaration

Swift

var dynamic: Bool

Objective-C

@property(nonatomic, getter=isDynamic) BOOL dynamic

Discussion

If the value is NO, the physics body ignores all forces and impulses applied to it. This property is ignored on edge-based bodies; they are automatically static.

正如 0x141E 所说，你必须让你的 SKPhysicsBody 动态，否则它不会移动。