ios - 将 CUnsignedChar 指针转换为 CChar 指针

Question

我有一个 objective-c 函数，它给了我一个

UnsafePointer<UInt8>/UnsafePointer<CUnsignedChar>. 

但是我需要这些数据作为

UnsafePointer<Int8>

不幸的是我需要的功能没有实现

UnsafePointer<UInt8>.

Answer 1

在您的情况下，“不安全的位转换”将是最简单的解决方案:

let ptr: UnsafePointer<UInt8> = ...
let i8ptr = unsafeBitCast(ptr, to: UnsafePointer<Int8>.self)

另一个选项是“内存重新绑定(bind)”:

ptr.withMemoryRebound(to: Int8.self, capacity: <count>) { i8ptr in
    // ...
}