BOOL isUppercase = [[NSCharacterSet uppercaseLetterCharacterSet] characterIsMember:[s characterAtIndex:0]];

return [myString rangeOfCharacterFromSet: [NSCharacterSet uppercaseLetterCharacterSet]].location==0;

- (NSString *)capitalizedString;

NSString *firstCharacter = [s substringWithRange:NSMakeRange(0,1)];
if (firstCharacter != nil && [firstCharacter isEqualToString:[firstCharacter uppercaseString]]) {
//first character was capitalized
} else {
//first character was lowercase
}