withUnsafePointers 不可用

Question

我正在嘗試將以下代碼從 swift 2 升級到 3，但我發現 withUnsafePointers 不可用：改用嵌套 withUnsafePointer。 我已經嘗試了幾種方法，但我無法做到。 他是我的代碼

  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

錯誤信息：

withUnsafePointers 不可用：改用嵌套的 withUnsafePointer

手段代替調用withUnsafePointers（它有兩個項目，並創建指向每個）與兩次調用withUnsafePointer ，一個接一個的瓶蓋內，每次取一個項目，並創建一個指向它的指針。

所以這：

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

變成這樣：

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

Answer 2

我在剛剛更新為 swift3 的項目中使用 linphone。 這就是我將這些行更新為的內容。 似乎運作良好。 希望這可以幫助！

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 */)
        }