我有一个用户注册的应用程序，每次他们完成一个级别时，它都会被发送到 Parse。到目前为止一切都很好。现在，当用户想要添加 friend 时，他们输入他们的电子邮件，然后将他们的名字添加到 NSMutableArray 并将他们的分数添加到单独的 NSMutableArray。现在，我需要一些方法来将它们更新为可用的最新乐谱。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];
}
这会在应用关闭并重新打开时成功加载数据。现在，我需要它用新数据刷新并选择在每次出现 View 时都这样做。
那么我可以在 ViewDidAppear 中做什么来更新电子邮件的每个值。所以我在想，每封电子邮件都会更改另一个 NSMutableArray 中的值，因为索引是相等的。问题是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？这看起来行得通吗？
最佳答案
在查询中，使用 whereKey:matchesQuery:查找所有与 friend 关联的分数对象(子查询是查找 friend )。您还想使用 includeKey:以便 friend 有空。
关于ios - 从 Parse 刷新和更新 NSMutableA rray 中的对象，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20925776/