withUnsafePointers不可用

Question

我想将下面的代码从swift 2升级到3，并且我得到withUnsafePointers is unavailable：使用nesterd withUnsafePointer代替。我已经尝试了一些方法，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withUnsafePointer代替

手段代替调用withUnsafePointers（它有两个项目，并创建指针给每个人）两个电话withUnsafePointer，一个在对方的封闭，每个拿一个项目，并创建一个指针。

所以这个：

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

变为这样：

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

Answer 2

我在一个项目我刚刚更新到swift3使用Linphone中。这是我更新这些行。似乎运作良好。希望这可以帮助！

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 */) 
     }