如何模糊除2个节点之外的所有内容Spritekit（Swift）

Question

时，我想模糊游戏的背景

self.view?.scene?.paused = true

但是按钮和暂停的标签（两个SKSpriteNode）都不应该模糊。它们都有不同的Z指数值。 按下按钮节点时暂停场景，再次按下按钮时恢复场景。

我无法在Swift中找到实现这一目标的方法。 我找到了一些使用SKEffectNode的建议？

Answer 1

基本步骤......

1. 创建SKEffectsNode
2. 创建CIGaussianBlur CIFilter
3. 将过滤器分配给效果节点
4. 将节点添加到效果节点（子节点将模糊）

和Swift中的示例代码......

// Create an effects node with a gaussian blur filter
let effectsNode = SKEffectNode()
let filter = CIFilter(name: "CIGaussianBlur")
// Set the blur amount. Adjust this to achieve the desired effect
let blurAmount = 10.0
filter?.setValue(blurAmount, forKey: kCIInputRadiusKey)

effectsNode.filter = filter
effectsNode.position = self.view!.center
effectsNode.blendMode = .alpha

// Create a sprite
let texture = SKTexture(imageNamed: "Spaceship")
let sprite = SKSpriteNode(texture: texture)

// Add the sprite to the effects node. Nodes added to the effects node
// will be blurred
effectsNode.addChild(sprite)
// Add the effects node to the scene
self.addChild(effectsNode)

// Create another sprite
let sprite2 = SKSpriteNode(texture: texture)
sprite2.position = self.view!.center
sprite2.size = CGSize(width:64, height:64);
sprite2.zPosition = 100

// Add the sprite to the scene. Nodes added to the scene won't be blurred
self.addChild(sprite2)