ios - withUnsafePointers不可用

我正在尝试将以下代码从swift 2升级到3，但我发现withUnsafePointers不可用:请改用nesterd withUnsafePointer。我已经尝试了几种方法，但是我做不到。他是我的密码

  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 */)
        })

最佳答案

错误信息:

withUnsafePointers不可用:改用嵌套的withUnsafePointer

表示用对withUnsafePointer的两次调用替换对withUnsafePointers的调用(该过程需要两个项目并创建指向每个项目的指针)，另一个对ojit_code的调用在另一个闭包内，每个都接受一个项目并创建一个指向它的指针。

所以这:

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

变成这个:

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