Swift 3 - 試圖將字典投射到CFDictionary

Question

當我試圖創建一個CFDictionary數組時，我收到一個錯誤（如下圖所示）。

這是代碼：

let attrs = [kCVPixelBufferCGImageCompatibilityKey:kCFBooleanTrue, kCVPixelBufferCGBitmapContextCompatibilityKey:kCFBooleanTrue] as CFDictionary 

但奇怪的是，我使用的另一個項目代碼在同一行，沒有收到任何錯誤。錯誤是什麼意思？

Error: Contextual type 'CFDictionary' cannot be used with dictionary literal

Answer 1

您可以使用CFDictionary如下

let attrs = [kCVPixelBufferCGImageCompatibilityKey as String :kCFBooleanTrue, 
      kCVPixelBufferCGBitmapContextCompatibilityKey as String:kCFBooleanTrue] as 
     CFDictionary 

希望這將有助於