如何强制转换UnsafePointer<UnsafeMutablePointer<Float>>？转到UnsafeMutablePointer<UnsafeMutablePointer<Float>?>！

Question

在Swift中，我有一个需要与之交互的C API。其中一个函数以指针数组作为参数，Swift将其导入为

  `UnsafeMutablePointer<UnsafeMutablePointer<Float>?>! `

Swift端的相应输入是AVAudioPCMBuffer.floatChannelData，其定义如下

UnsafePointer<UnsafeMutablePointer<Float>>?

我很难在这两者之间做出选择。我尝试通过执行以下操作使其成为可变的：

UnsafeMutablePointer<UnsafeMutablePointer<Float>>(AVAudioPCMBuffer.floatChannelData)

但这并不管用。Swift指针类型之间的转换非常令人沮丧。任何帮助都将不胜感激。

谢谢

Answer 1

var testPtr : UnsafeMutablePointer<UnsafeMutablePointer<Float>?>! = nil
var testPtr2 : UnsafePointer<UnsafeMutablePointer<Float>>? = nil

testPtr = unsafeBitCast( testPtr2, to: UnsafeMutablePointer<UnsafeMutablePointer<Float>?>!.self)