ios - 对象符合协议(protocol)Swift

谁能帮忙找到如何用Swift编写此代码

NSMutableDictionary<FBOpenGraphObject> *object = [FBGraphObject openGraphObjectForPost];

上面的ObjectiveC代码表示object类型的NSMutableDictionary符合协议FBOpenGraphObject。我试图迅速地代表这个

var object:FBOpenGraphObject, Dictionary = FBGraphObject.openGraphActionForPost()

// specify that this Open Graph object will be posted to Facebook
object.provisionedForPost = true   //This will not work

但这是不合适的，我无法为对象分配任何值。帮我弄清楚如何快速地表示对象符合协议

最佳答案

也许您可以这样做:

var obj = FBGraphObject.openGraphActionForPost()
if let fbObj = obj as? FBOpenGraphObject {
    // specify that this Open Graph object will be posted to Facebook
    fbObj.provisionedForPost = true // use fbObj for FBOpenGraphObject-specific members
    obj["title"] = "Test hot spot" // use obj for Dictionary-specific members
    // Both obj and fbObj vars point to the same object
}