如何解决SpriteKit SKTexture的CGImage "Context leak"？

Xcode 11-12，MacOS Catalina，Swift 5项目。。。

该代码被产生为"；检测到上下文泄漏，msgtracer返回-1"；错误：

import Foundation
import SpriteKit
import GameKit
func getTextureImage(_ index: Int, isSky: Bool = true) -> CGImage {

let perlinSource = GKPerlinNoiseSource(
frequency: 1,
octaveCount: 7,
persistence: 0.5,
lacunarity: 2.0,
seed: 123
)

let noise = GKNoise(perlinSource)

noise.gradientColors = [
-1.0: NSColor(red: 0.0, green: 0.15, blue: 0.85, alpha: 1.0),
1.0 : NSColor(red: 1, green: 1, blue: 1, alpha: 1.0),
]

noise.move(by: vector_double3(Double(index), 0, 0))

let noiseMap = GKNoiseMap(noise,
size: SIMD2(repeating: 1),
origin: SIMD2(repeating: 0.0),
sampleCount: SIMD2(repeating: 16),
seamless: false)

let t = SKTexture(noiseMap: noiseMap)
let i = t.cgImage()

return i
}

for x in 0...128 {

let texture = getTextureImage(x)

}

如何使用.cgImage()方法调用来解决行中的错误？我需要彩色GKNoiseMap中的CGImage数据，然后我将使用它与MetalKit一起使用将数据加载到MTLTexture

MTKTextureLoader.newTexture(cgImage: texture, options: textureLoaderOptions)