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

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)
    }
}