利用block从前后一个页面到前一个页面传值

- (void)add {
//增加
EditViewController *editVC = [[EditViewController alloc]init];
UINavigationController *navigation = [[UINavigationController alloc]initWithRootViewController:editVC];
[editVC pass:^(Person *person) {
NSString *key = [person.name uppercasePinYinFirstLetter];
if ([self.keyArray containsObject:key]) {
NSMutableArray *array = self.addressDic[key];
[array addObject:person];
[self.tableView reloadData];
} else {
NSMutableArray *array = [NSMutableArray arrayWithCapacity:0];
[array addObject:person];
[self.addressDic setObject:array forKey:key];
[self.keyArray addObject:key];
[self.keyArray sortUsingSelector:@selector(compare:)];
[self.tableView reloadData];
}
}];
[self presentViewController:navigation animated:YES completion:nil];
}