“UnsafePointer<UInt8>”的初始化导致悬空指针

Question

试图清除我的 SWIFT 5/XCODE 项目中的一些警告，但我陷入了这一困境：

 let sendBytes:[UInt8] = [0x0, 0x0, 0x5, 0x0]
 let msgData = Data(bytes: UnsafePointer<UInt8>(sendBytes), count: sendBytes.count)
 socket.write(msgData, withTimeout: -1.0, tag: 0)
 socket.readData(withTimeout: -1.0, tag: 0)
        

对于“UnsafePointer”，我收到以下警告和两条建议：

“UnsafePointer”的初始化导致悬空指针

1. 从“[UInt8]”到“UnsafePointer”的隐式参数转换生成一个仅在调用“init(_:)”期间有效的指针

2. 在数组上使用“withUnsafeBufferPointer”方法，以便将参数显式转换为对定义范围有效的缓冲区指针

这是我的解决方案，更好吗？

版本1：

let sendBytes:[UInt8] = [0x0, 0x0, 0x5, 0x0]
let uint8Pointer = UnsafeMutablePointer<UInt8>.allocate(capacity: sendBytes.count)
uint8Pointer.initialize(from: sendBytes, count: sendBytes.count)
let msgData = Data(bytes: uint8Pointer, count: sendBytes.count)
socket.write(msgData, withTimeout: -1.0, tag: 0)
socket.readData(withTimeout: -1.0, tag: 0)

版本2：

let sendBytes:[UInt8] = [0x0, 0x0, 0x5, 0x0]                     
let uint8Pointer = UnsafeMutablePointer<UInt8>.allocate(capacity: sendBytes.count)
uint8Pointer.initialize(from: sendBytes, count: sendBytes.count)
let msgData = Data(bytes: uint8Pointer, count: sendBytes.count)
socket.write(msgData, withTimeout: -1.0, tag: 0)
socket.readData(withTimeout: -1.0, tag: 0)
uint8Pointer.deallocate()

Answer 1

从 Swift 3 开始，可以简单地Data使用UInt8数组初始化实例。

let sendBytes:[UInt8] = [0x0, 0x0, 0x5, 0x0]
let msgData = Data(sendBytes)