sceneKit- SCNText详细讲解

 let text = SCNText(string: "酷", extrusionDepth: 2)
 let textNode = SCNNode(geometry: text)
textNode.position = SCNVector3Make(0, 0, 0)
scene.rootNode.addChildNode(textNode)
// 创建2D文字的时候只需要将 extrusionDepth 设置为0即可
text.extrusionDepth = 0
// 设置字体的大小
text.font = UIFont.systemFont(ofSize: 1)

     let text = SCNText(string: "酷走天涯就是帅", extrusionDepth: 1)
    text.font = UIFont.systemFont(ofSize:1)
    // 第一步 开启包裹模式
    text.isWrapped = true
    // 第二步 设置包裹容器的大小
    text.containerFrame = CGRect(x: 0, y: 0, width: 1, height: 6)

   text.containerFrame = CGRect(x: 0, y: 0, width: 3, height: 6)

func rendererTextNode(_ node:SCNNode){
   let text = node.geometry as! SCNText
   let m1 = SCNMaterial()
   m1.diffuse.contents = UIColor.red
   let m2 = SCNMaterial()
   m2.diffuse.contents = UIColor.green
   let m3 = SCNMaterial()
   m3.diffuse.contents = UIColor.blue
   text.materials = [m1,m2,m3]
}

    let min = text.boundingBox.min
    let max = text.boundingBox.max
    let width = max.x - min.x
    let height = max.y - min.y
    let length = max.z - min.z

// 将文字放在中心点
func rePlaceTextNodeToCenter(node:SCNNode){
    let text = node.geometry as! SCNText
    let min = text.boundingBox.min
    let max = text.boundingBox.max
    let width = max.x - min.x
    let height = max.y - min.y
    let length = max.z - min.z
    let position = SCNVector3Make(-width/2.0 - min.x, -height/2.0 - min.y, -length/2.0 - min.z)
    node.position = position
}

    let text = SCNText(string: "酷走天涯的点点滴滴", extrusionDepth: 1)
    text.font = UIFont.systemFont(ofSize:1)
    text.isWrapped = true
    text.containerFrame = CGRect(x: 0, y: 0, width: 4, height: 2)
    text.alignmentMode = kCAAlignmentJustified