objective c - Message controller iOS -

i new in ios programming, know old question confused here message controller. want make application in want send simple messages. if set multiple recipients can of 1 can view recipients? if so,then how can make private message 1 recipient can't view other recipients?

here code composing message more recipients

- (void)showsms:(nsstring*)file {      if(![mfmessagecomposeviewcontroller cansendtext]) {     uialertview *warningalert = [[uialertview alloc] initwithtitle:@"error" message:@"your device doesn't support sms!" delegate:nil cancelbuttontitle:@"ok" otherbuttontitles:nil];         [warningalert show];         return;     }      nsarray *recipents = @[@"12345678", @"72345524"];     nsstring *message = [nsstring stringwithformat:@"just sent %@ file email. please check!", file];      mfmessagecomposeviewcontroller *messagecontroller = [[mfmessagecomposeviewcontroller alloc] init];     messagecontroller.messagecomposedelegate = self;     [messagecontroller setrecipients:recipents];     [messagecontroller setbody:message];     [self presentviewcontroller:messagecontroller animated:yes completion:nil]; } 

there's setting in settings -> messages disables group messaging, , recipients receive messages separately. other that, can't mfmessagecomposeviewcontroller because there's no bcc option. send messages 1 @ time though