取消引用UnsafeMutablePointer<UnsafeMutableRawPointer>

Question

我有一个正在传递数据的块，我想把它转换成一个浮点数组的数组--例如[0.1,0.2,0.3，1.0，0.3，0.4，0.5，1.0，0.5，0.6，0.7，1.0]。这些数据以data:UnsafeMutablePointer<UnsafeMutableRawPointer>的形式传递给我(内部数组是RGBA值)

fwiw --块参数来自SCNParticleEventBlock

如何将数据解引用到[Float]中？一旦我有了包含内部数组的数组，我就可以用以下命令引用内部数组(colorArray)数据：

let rgba: UnsafeMutablePointer<Float> = UnsafeMutablePointer(mutating: colorArray)
let count = 4
for i in 0..<count {
    print((rgba+i).pointee)
}

fwiw --这是苹果引用数据的示例Objective-C代码(from SCNParticleSystem handle(_:forProperties:handler:) )

[system handleEvent:SCNParticleEventBirth
      forProperties:@[SCNParticlePropertyColor]
          withBlock:^(void **data, size_t *dataStride, uint32_t *indices , NSInteger count) {
              for (NSInteger i = 0; i < count; ++i) {
                  float *color = (float *)((char *)data[0] + dataStride[0] * i);
                  if (rand() & 0x1) { // Switch the green and red color components.
                      color[0] = color[1];
                      color[1] = 0;
                  }
              }
          }];