swift3 – Swift 3 UnsafePointer($0)不再在Xcode 8 beta 6中编

发布时间：2020-12-14 06:09:07 所属栏目：百科来源：网络整理

导读：我的代码snipet如下…： let defaultRouteReachability = withUnsafePointer(to: zeroAddress) { SCNetworkReachabilityCreateWithAddress(nil,UnsafePointer($0)) } …不再编译与以下错误，我不明白： "'init' is unavailable: use 'withMemoryRebound(to:c

我的代码snipet如下…：

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

…不再编译与以下错误，我不明白：

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

如何解决它？

从Xcode 8 beta 6的发行说明：

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：

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

（编辑：李大同）

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