ios - `CountedSet` initialization issue -

i'm comparing characters contained within 2 words. in seeking accomplish this, set (aka nsset) seemed way go accomplish task. i've discovered returns false positives on matches, attempting use countedset (aka nscountedset) instead.

i'm able initialize set without issue, can't countedset initializer work. here's i've done...

i start string:

// let's mytextfield.text = "test" let textfieldcharacters = mytextfield.text?.characters // word string enable list of words let wordcharacters = word.characters 

then dump characters array:

var wordcharactersarray = [character]() character in wordcharacters {     wordcharacterarray.append(character) }   var textfieldcharactersarray = [character]()     character in textfieldcharacters {     wordcharacterarray.append(character) } 

then create set character arrays:

let textfieldset = set<character>(textfieldcharactersarray) let wordset = set<character>(wordcharactersarray) 

finally, test see if textfieldset superset of wordset following:

textfieldset.issuperset(of: wordset) 

going example, if mytextfield.text "test", i'm returning values word characters superset of wordset, counts of individual elements don't match character counts of mytextfield.text

in researching issue, i've found countedset (fka nscountedset), think resolve issue. has 2 method signatures:

public convenience init(array: [anyobject]) public convenience init(set: set<nsobject>) 

i've tried initializing 2 sets of characters so:

let textfieldset = countedset(array: textfieldcharacterarray) let wordset = countedset(array: wordcharacterarray) 

i following error sets

cannot convert value of type '[character]' expected argument type '[anyobject]'.

so tried initializing set this:

let textfieldset = countedset(array: textfieldcharacterarray as! [anyobject]) 

which yields following error:

'anyobject' not subtype of 'character'

i've tried initialize countedset set, per method signature, errors when try that, too.

any suggestions how initialize countedset appreciated.

you correct if need compare not presents of elements count, should use countedset, renaming of nscountedset swift 3.0. problem running countedset can accept elements objects , characters not. eric d points out in comment, easies way around mapping [character] [string] bridge [nsstring].

you not running problem using set, because native swift collection type initialize elements of type. why can initialize set [character].

to see difference:

let word = "helo" let wordcharacters = array(word.characters) let wordset = set(wordcharacters) let wordcharstrings = wordcharacters.map{string($0)} let wordcountedset = countedset(array: wordcharstrings)  let textfield = "hello" let textfieldcharacters = array(textfield.characters) let textset = set(textfieldcharacters) let textfieldcharstrings = textfieldcharacters.map{string($0)} let textfieldcountedset = countedset(array: textfieldcharstrings)  textfieldcountedset.issubset(of: wordcountedset as! set<nsobject>) // returns false, if word had 2 or more l's return true textset.issubset(of: wordset) // returns true