在Swift 3中寫入UnsafeMutablePointer

Question

下面的代碼在早期版本的Swift中工作，現在編譯器拒絕它。 我需要這個函數來從ObjectiveC與Swift交互。

@objc public static func myFunc(jdUT: Double, _ lon: Double, _ lat: Double, 
              _ dayLen: Double, _ SbhDeg: Double, _ MgrbDeg: Double, 
              omsk: UnsafeMutablePointer<Double>) 
    { 
     var z = somefuncion() 
     // this line gives this error : Cannot assign to property: 'omsk' is a 'let' constant 
     omsk.memory=z; 
    } 

Answer 1

@objc public static func myFunc(jdUT: Double, _ lon: Double, _ lat: Double, 
             _ dayLen: Double, _ SbhDeg: Double, _ MgrbDeg: Double, 
             inout omsk: UnsafeMutablePointer<Double>) 
{ 
    var z = somefuncion() 
    // this line gives this error : Cannot assign to property: 'omsk' is a 'let' constant 
    omsk.memory=z; 
} 

添加INOUT鄂木斯克參數應該工作了。

Answer 2

錯誤消息是誤導性的。的 Unsafe(Mutable)Pointer的memory財產已被重命名爲pointee斯威夫特3：

let z = someFunction() 
omsk.pointee = z