我有一个用户注册的应用程序，每次他们完成一个级别，它就被发送到Parse。到目前为止它一切都很好用。现在，当用户想要添加朋友时，他们会输入他们的电子邮件，并将其名称添加到NSMutableArray，并将他们的分数添加到单独的NSMutableArray。现在，我需要一些方法将它们更新为可用的最新分数。所以这就是我所拥有的：
// This is called when an add button is pressed
- (void)launchingAlertForEmail {
UIAlertView *emailAlertView = [[UIAlertView alloc] initWithTitle:@"Add a friend" message:@"Type in your friends email" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Add friend", nil];
emailAlertView.alertViewStyle = UIAlertViewStylePlainTextInput;
[emailAlertView show];
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
if (buttonIndex == 1) {
friendEmail = [[alertView textFieldAtIndex:0] text];
[self findUserMatchingEmail];
}
}
- (void)findUserMatchingEmail {
PFQuery *query = [PFQuery queryWithClassName:@"User"];
[query whereKey:@"username" equalTo:friendEmail];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
// The find succeeded.
NSLog(@"Successfully retrieved %d scores.", objects.count);
// Do something with the found objects
for (PFObject *object in objects) {
NSLog(@"%@", object.objectId);
}
if (objects.count == 0) {
NSLog(@"Tis true");
} else {
[self insertNewObject:self];
}
} else {
// Log details of the failure
NSLog(@"Error: %@ %@", error, [error userInfo]);
}
}];
}
- (void)insertNewObject:(id)sender {
if ([_objects containsObject:friendEmail]) {
NSLog(@"yea");
}
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if (!_objects) {
_objects = [defaults mutableArrayValueForKey:@"_objects"];
}
[_objects insertObject:friendEmail atIndex:0];
if (!objects2) {
objects2 = [defaults mutableArrayValueForKey:@"objects2"];
}
PFQuery *query = [PFQuery queryWithClassName:@"User"];
[query whereKey:@"username" equalTo:friendEmail];
NSArray *usersPosts = [query findObjects];
for (NSDictionary *friendData in usersPosts) {
NSString *intervalString = [friendData objectForKey:@"interval"];
float interval = [intervalString floatValue];
NSString *newInterval = [NSString stringWithFormat:@"Interval : %.0f minutes", interval / 60];
[objects2 insertObject:newInterval atIndex:0];
}
if ([_objects containsObject:friendEmail]) {
NSLog(@"yea");
}
[defaults setObject:_objects forKey:@"_objects"];
[defaults setObject:objects2 forKey:@"objects2"];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self.tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
}
当应用关闭并重新打开时，这会成功加载数据。现在，我需要用新数据刷新它，并且每次出现视图时都选择这样做。
那么我可以在ViewDidAppear中做些什么来更新电子邮件的每个值。所以我想每个电子邮件都会更改其他NSMutableArray中的值，因为索引是相等的。问题是我如何更改相反数组中每封电子邮件的值？我会使用for循环吗？这看起来有用吗？