Check out the NSDictionary class definition https://developer.apple.com/documentation/foundation/nsdictionary?language=objc
There is no forEach method on NSDictionary but you can do something like this:
let keys = [ "key1", "key2" ]
let values = ["value1", "value2"]
let dict = NSDictionary.dictionaryWithObjects_forKeys(values,keys)
for (let item in dict) {
console.log(item)
console.log(dict[item])
}