withUnsafePointers不可用

Question

我正在尝试将以下代码从swift 2升级到3并且我得到withUnsafePointers不可用：改为使用nesterd withUnsafePointer。我尝试了几种方法，但我无法做到。他是我的代码

  var v: LinphoneManager = self
  var lct: LinphoneCoreVTable = LinphoneCoreVTable()
       let theLinphoneCore : OpaquePointer = withUnsafePointers(&lct, &v, { (ptr: UnsafePointer<LinphoneCoreVTable>, selfPtr: UnsafePointer<LinphoneManager>) -> OpaquePointer in

                let voidPtr: UnsafeMutableRawPointer = unsafeBitCast(selfPtr, to: UnsafeMutableRawPointer.self)
             return linphone_core_new_with_config (ptr, self.configDb!, voidPtr /* user_data */)
        })

Answer 1

错误消息：

  

withUnsafePointers不可用：使用嵌套的withUnsafePointer代替

意味着替换对withUnsafePointers的调用（它需要两个项并创建指向每个项的指针），两个调用withUnsafePointer，一个调用另一个调整，每个调用一个项目并创建一个指针。

所以这个：

withUnsafePointers(&a, &b) { aPtr, bPtr in
    // do something with aPtr and bPtr
}

成为这个：

withUnsafePointer(&a) { aPtr in
    withUnsafePointer(&b) { bPtr in
        // do something with aPtr and bPtr
    }
}

Answer 2

我在刚刚更新到swift3的项目中使用了linphone。这是我更新这些行的内容。似乎运作良好。希望这有帮助！

var lct: LinphoneCoreVTable = LinphoneCoreVTable()
        theLinphoneCore = withUnsafePointer(to: &lct) { (ptr: UnsafePointer<LinphoneCoreVTable>) -> OpaquePointer in
            let selfPtr: BTVoipService = self
            let voidPtr: UnsafeMutableRawPointer = unsafeBitCast(selfPtr, to: UnsafeMutableRawPointer.self)
            return linphone_core_new_with_config (ptr, self.configDb!, voidPtr /* user_data */)
        }