Pass the ID number back to the birthday string

Code:

- (void) viewdidload {[Super viewdidload]; //additional setup after loading the view, typically from a nib.NSString*birthday=[self Birthdaystrfromidentitycard:@"134825194401014241"]; NSLog (@"--birthday-%@", BirthDay);}#pragma-mark-functions//Pass ID to return birthday string-(NSString *) Birthdaystrfromidentitycard: (NSString *) numberstr{nsmutablestring*result = [nsmutablestring stringwithcapacity:0]; NSString*year =Nil; NSString*month =Nil; BOOL Isallnumber=YES; NSString*day =Nil; if([Numberstr length]< -)        returnresult; //* * Interception of the first 14 digitsNSString *fontnumer = [Numberstr substringwithrange:nsmakerange (0, -)]; //* * The first 14 digits of the test are all numbers;    Const Char*str =[Fontnumer utf8string]; Const Char*p =str;  while(*p!=' /') {        if(! (*p>='0'&&*p<='9')) Isallnumber=NO; P++; }        if(!isallnumber)returnresult; year= [Numberstr Substringwithrange:nsmakerange (6,4)]; Month= [Numberstr Substringwithrange:nsmakerange (Ten,2)]; Day= [Numberstr Substringwithrange:nsmakerange ( A,2)];    [Result Appendstring:year]; [Result appendString:@"-"];    [Result Appendstring:month]; [Result appendString:@"-"];    [Result Appendstring:day]; returnresult; }

Pass the ID number back to the birthday string