如何將數組轉換爲UnsafeMutablePointer <UnsafeRawPointer？> Swift 3.0？

Question

這是我在以前版本的雨燕的可行代碼：

let imageOptionsDictKeys = [ kCVPixelBufferPixelFormatTypeKey, kCVPixelBufferWidthKey, kCVPixelBufferHeightKey, kCVPixelBufferOpenGLESCompatibilityKey, kCVPixelBufferIOSurfacePropertiesKey] 
let imageOptionsDictValues = [ cvPixelFormatType, frameW, frameH, boolYES] 

var keyCallbacks = kCFTypeDictionaryKeyCallBacks 
var valueCallbacks = kCFTypeDictionaryValueCallBacks 

let imageOptions = CFDictionaryCreate(kCFAllocatorDefault, UnsafeMutablePointer(imageOptionsDictKeys), UnsafeMutablePointer(imageOptionsDictValues), 4, &keyCallbacks, &valueCallbacks) 

後的雨燕3.0的變化我必須將我的鑰匙和值數組到UnsafeMutablePointer<UnsafeRawPointer?>創建CFDictionary。

這樣：

let imageOptionsDictKeysPointer = UnsafeMutablePointer<UnsafeRawPointer?>.allocate(capacity: 1) 
    imageOptionsDictKeysPointer.initialize(to: imageOptionsDictKeys) 

給出了一個錯誤訪問錯誤。

和閱讀文檔後，我試圖編譯這段代碼：

 let imageOptionsDictKeys = [kCVPixelBufferPixelFormatTypeKey, kCVPixelBufferWidthKey, kCVPixelBufferHeightKey, kCVPixelBufferOpenGLESCompatibilityKey] 
     let imageOptionsDictKeysRawPointer = Unmanaged.passUnretained(imageOptionsDictKeys).toOpaque() 
     let imageOptionsDictKeysPointer = UnsafeMutablePointer<UnsafeRawPointer?>.allocate(capacity: 1) 
     imageOptionsDictKeysPointer.initialize(to: imageOptionsDictKeysRawPointer) 

     let imageOptionsDictValues = [ cvPixelFormatType, frameW, frameH, boolYES] 
     let imageOptionsDictValuesRawPointer = Unmanaged.passUnretained(imageOptionsDictValues).toOpaque() 
     let imageOptionsDictValuesPointer = UnsafeMutablePointer<UnsafeRawPointer?>.allocate(capacity: 1) 
     imageOptionsDictValuesPointer.initialize(to: imageOptionsDictValuesRawPointer) 

     let imageOptions = CFDictionaryCreate(kCFAllocatorDefault, imageOptionsDictKeysPointer, imageOptionsDictValuesPointer, 4, &keyCallbacks, &valueCallbacks) 

但錯誤泛型參數「實例」無法在行Unmanaged.passUnretained（陣列）推斷出現。 toOpaque（）

我不知道如何以編程方式現在創建CFDictionary。

Answer 1

我只是解決了類似的問題，轉換陣列UnsafeMutablePointer< UnsafeMutablePointer<T>>，你可以在這裏找到： Swift 3 UnsafeMutablePointer initialization for C type float**

要轉換使用相同的方案迅速陣列，使用UnsafeMuTablePointer的建議在這裏：http://technology.meronapps.com/2016/09/27/swift-3-0-unsafe-world-2/