Swift 2: Type of expression is ambiguous without more context, for a dictionary

问题

Why is the compiler throwing an error for the following code that attempts to create a dictionary? How would you fix this code?

let options = [
  kCVPixelBufferCGImageCompatibilityKey: true,
  kCVPixelBufferCGBitmapContextCompatibilityKey: true]

I've looked through all of the other related questions with this same error and have not been able to find a solution.

回答1:

How about

let options : [NSObject : AnyObject] = [
    kCVPixelBufferCGImageCompatibilityKey: true,
    kCVPixelBufferCGBitmapContextCompatibilityKey: true]

[NSObject : AnyObject] is the equivalent to NSDictionary in Objective-C. The library you're using requires it to be of this type.

来源：https://stackoverflow.com/questions/33246582/swift-2-type-of-expression-is-ambiguous-without-more-context-for-a-dictionary