参考苹果官网

根据官网指导跳转到

https://github.com/apple/swift-evolution/blob/master/proposals/0055-optional-unsafe-pointers.md

找到了Conversion between pointers指针类型转换

代码如下：

// Before:
let untypedPointer = UnsafePointer<Void>(ptr)

// After:
let untypedPointer = ptr.map(UnsafePointer<Void>.init)

// Usually the pointee type is actually inferred:
foo(ptr.map(UnsafePointer.init))