外部ファイルから配列に読み込む

//可変配列を用意
NSMutableArray *words = [NSMutableArray array];
NSError *error;
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"wordList" ofType:@"txt"];
NSString *content = [NSString stringWithContentsOfFile:filePath
                                              encoding:NSUTF8StringEncoding
                                                 error:&error];
for (NSString *line in [content componentsSeparatedByString:@"\n"]) {
    [words addObject:line];
}