objective c - NSArray from NSCharacterset -

currently able make array of alphabets below

[[nsarray alloc]initwithobjects:@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",@"i",@"j",@"k",@"l",@"m",@"n",@"o",@"p",@"q",@"r",@"s",@"t",@"u",@"v",@"w",@"x",@"y",@"z",nil]; 

knowing available over

[nscharacterset uppercaselettercharacterset] 

is there anyway can make array out of it?

the following code creates array containing characters of given character set. works characters outside of "basic multilingual plane" (characters > u+ffff, e.g. u+10400 deseret capital letter long i).

nscharacterset *charset = [nscharacterset uppercaselettercharacterset]; nsmutablearray *array = [nsmutablearray array]; (int plane = 0; plane <= 16; plane++) {     if ([charset hasmemberinplane:plane]) {         utf32char c;         (c = plane << 16; c < (plane+1) << 16; c++) {             if ([charset longcharacterismember:c]) {                 utf32char c1 = osswaphosttolittleint32(c); // make byte-order safe                 nsstring *s = [[nsstring alloc] initwithbytes:&c1 length:4 encoding:nsutf32littleendianstringencoding];                 [array addobject:s];             }         }     } } 

for uppercaselettercharacterset gives array of 1467 elements. note characters > u+ffff stored utf-16 surrogate pair in nsstring, example u+10400 stored in nsstring 2 characters "\ud801\udc00".

swift 2 code can found in other answers question. here swift 3 version, written extension method:

extension characterset {     func allcharacters() -> [character] {         var result: [character] = []         plane: uint8 in 0...16 self.hasmember(inplane: plane) {             unicode in uint32(plane) << 16 ..< uint32(plane + 1) << 16 {                 if let unichar = unicodescalar(unicode), self.contains(unichar) {                     result.append(character(unichar))                 }             }         }         return result     } } 

example:

let charset = characterset.uppercaseletters let chars = charset.allcharacters() print(chars.count) // 1521 print(chars) // ["a", "b", "c", ... "] 

(note characters may not present in font used display result.)