UnsafePointer 不再适用于 swift 3 [英] UnsafePointer no longer works in swift 3

问题描述

在我从 swift 2 转换为 swift 3 后，下面提到的行会弹出一个错误

let value = UnsafePointer(array1).pointee

<块引用>

'init' 不可用:使用 'withMemoryRebound(to:capacity:_)' 暂时将内存视为另一种布局兼容类型.

在swift2中就像

let value = UnsafePointer(array1).memory

谁能解释一下?抱歉，我对 swift3 还很陌生

在我对

进行更改后

let abc = UnsafePointer(array1).withMemoryRebound(to: <#T##T.Type#>, capacity: <#T##Int#>, <#T##body: (UnsafeMutablePointer) 抛出 -> Result##(UnsafeMutablePointer) 抛出 -> Result#>)

但仍然应该给变量输入什么值?抱歉，我四处搜索，但太糟糕了，我找不到解决方案

解决方案

你可以试试这个:

let rawPointer = UnsafeRawPointer(array1)让指针 = rawPointer.assumingMemoryBound(to: UInt32.self)让值 = 指针.pointee

原始指针是用于访问非类型数据的指针.

assumingMemoryBound(to:) 可以从 UnsafeRawPointer 转换为 UnsafePointer.

参考:Swift 3.0 不安全的世界

After I convert from swift 2 to swift 3, there is an error pop up for the below metioned line

let value = UnsafePointer<UInt32>(array1).pointee

'init' is unavailable: use 'withMemoryRebound(to:capacity:_)' to temporarily view memory as another layout-compatible type.

in swift2 it is like

let value = UnsafePointer<UInt32>(array1).memory

Can someone explain please? Sorry I'm quite new to swift3

After i have make the changes to

let abc = UnsafePointer<UInt32>(array1).withMemoryRebound(to: <#T##T.Type#>, capacity: <#T##Int#>, <#T##body: (UnsafeMutablePointer<T>) throws -> Result##(UnsafeMutablePointer<T>) throws -> Result#>)

but still what value should go in to the variable? Sorry, i have search around but too bad i can't find a solution

解决方案

You can try this:

let rawPointer = UnsafeRawPointer(array1)
let pointer = rawPointer.assumingMemoryBound(to: UInt32.self)
let value = pointer.pointee

Raw pointer is a pointer for accessing untype data.

assumingMemoryBound(to:) can convert from an UnsafeRawPointer to UnsafePointer<T>.

Reference :Swift 3.0 Unsafe World

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