Swift 3 UnsafePointer($0) 不再在 Xcode 8 beta 6 中编译 [英] Swift 3 UnsafePointer($0) no longer compile in Xcode 8 beta 6

问题描述

我的代码片段如下...:

My code snipet as follows …:

    let defaultRouteReachability = withUnsafePointer(to: &zeroAddress) {
        SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))
    }

... 不再编译，出现以下我不明白的错误:

… does no longer compile with the following error which I don't understand:

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

如何修复它?

推荐答案

来自 Xcode 8 beta 6 的发行说明:

From the Release Notes of Xcode 8 beta 6:

• 引入了 Unsafe[Mutable]RawPointer 类型，替代了 Unsafe[Mutable]Pointer.从 UnsafePointer 到UnsafePointer 已被禁止.Unsafe[Mutable]RawPointer提供用于无类型内存访问的 API 和用于绑定的 API记忆到一个类型.绑定内存允许在指针类型.见 bindMemory(to:capacity:), assumingMemoryBound(to:),和 withMemoryRebound(to:capacity:).(SE-0107)

• An Unsafe[Mutable]RawPointer type has been introduced, replacing Unsafe[Mutable]Pointer<Void>. Conversion from UnsafePointer<T> to UnsafePointer<U> has been disallowed. Unsafe[Mutable]RawPointer provides an API for untyped memory access, and an API for binding memory to a type. Binding memory allows for safe conversion between pointer types. See bindMemory(to:capacity:), assumingMemoryBound(to:), and withMemoryRebound(to:capacity:). (SE-0107)

在你的情况下，你可能需要这样写:

In your case, you may need to write something like this:

let defaultRouteReachability = withUnsafePointer(to: &zeroAddress) {
    $0.withMemoryRebound(to: sockaddr.self, capacity: 1) {zeroSockAddress in
        SCNetworkReachabilityCreateWithAddress(nil, zeroSockAddress)
    }
}

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