ios - Swift 3 - 试图将字典转换为 CFDictionary

Question

当我尝试创建一个数组作为 CFDictionary 时，出现错误(如下所示)。

这是代码:

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

但奇怪的是，我在另一个项目中使用了同一行代码，却没有收到任何错误。错误是什么意思？

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

Answer 1

您可以使用下面的代码将字典转换为 CFDictionary，如下所述:

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

希望这会有所帮助