I am working on a app that you can change when a item on the menu is in stock or out of stock.
I have it now so it changes the UISwitch to on or off when it loads the screen. I need each switch to change a NSString in parse that makes it one or zero.One meaning that it is on zero meaning its off.
I am fairly new to objective c and parse so if any one could help me get a start on this problem that would be great!
You might use something like that:
PFQuery *query = [PFQuery queryWithClassName:#"YourClass"];
[query whereKey:#"user" equalTo:[PFUser currentUser]];
[query getFirstObjectInBackgroundWithBlock:^(PFObject * yourClass, NSError *error) {
if (!error) {
// Found yourClass object
[yourClass setObject:isInStock forKey:#"isInStock"];
// Save
[yourClass saveInBackground];
} else {
// Did not find any yourClass object for the current user
NSLog(#"Error: %#", error);
}
}];
NSArray *listObjects = .... (loading from Server) // List of PFObject
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
PFObject *object = [listObjects objectAtIndex:indexPath.row];
YourCell *cell = .....
if ([[object valueForKey:#"sandwichesOutofstock"] intValue] == 1)
cell.switch.on = true;
else
cell.switch.on = false;
cell.switch.tag = 500 + index.row;
[cell.switch addTarget:self action:#selector(switchTouch:) forControlEvents:UIControlEventTouchUpInside]
.........
}
(IBAction)switchTouch:(UISwitch *)switch{
long index = switch.tag - 500;
PFObject *object = [listObjects objectAtIndex:index];
if(switch.on)
[object setValue:#"1" ForKey:#"sandwichesOutofstock"];
else{
[object setValue:#"0" ForKey:#"sandwichesOutofstock"];
}
[object saveInBackground];
[self.tableView reloadRowsAtIndexPaths:[NSIndexPath indexPathForRow:index inSection:0] withRowAnimation:UITableViewRowAnimationNone];
}
You could assign a reference of the PFObject to the cell. Then when the switch changes just get the cell's object and make the change.
Related
I have an object called masterMessages filled with objects called messages. Each message object has five keys:
objectId
senderId
senderName
messageBody
timestamp
Basically what I am doing now is querying all the messages sent to my user in this object called masterMessages. Then i'm using:
self.senderIds = [masterMessages valueForKeyPath:#"#distinctUnionOfObjects.senderId"];
to get all the different sender ids (senderId) in an array called senderIds. With this I will populate my conversations table. But i want to populate it with the sender names (senderName) and not the senderIds. I only do it this way in case two users have the same name.
I am trying to find:
How do I say "get valueForKey:#"senderName" for this senderId
and
is there a better way to populate my conversations table?
Here is my code:
note: im using parse.com
-(void)viewWillAppear:(BOOL)animated{
NSString *userId = [[PFUser currentUser] objectId];
PFQuery *query = [PFQuery queryWithClassName:#"lean"];
[query whereKey:#"recipientId" equalTo:userId];
[query orderByDescending:#"createdAt"];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (error) {
NSLog(#"Error: %# %#", error, [error userInfo]);
}
else {
// We found messages!
masterMessages = objects;
NSLog(#"self.messages = %#", masterMessages);
self.senderIds = [masterMessages valueForKeyPath:#"#distinctUnionOfObjects.senderId"];
NSLog(#"self.senderIds = %#", self.senderIds);
[self.tableView reloadData];
}
}];
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
return [self.senderIds count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
NSLog(#"self.senderIds = %#", self.senderIds);
NSString *senderDisplayName = [self.senderIds objectAtIndex:indexPath.row];
NSLog(#"sender = %#", senderDisplayName);
cell.textLabel.text = senderDisplayName;
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
selectedId = [self.senderIds objectAtIndex:indexPath.row];
[self performSegueWithIdentifier:#"ShowMissionMessage" sender:self];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"ShowMissionMessage"]) {
[segue.destinationViewController setHidesBottomBarWhenPushed:YES];
MissionChat *missionchatviewcontroller = (MissionChat *)segue.destinationViewController;
missionchatviewcontroller.selectedId = selectedId;
missionchatviewcontroller.masterMessages = masterMessages;
}
}
There are a few issues in the question, one is how to dereference PFObjects, which we took care of on another thread. The rest of this question is about (a) how to use parse objects to build a datasource to support a tableview, and a harder one (b) how to get information from related objects.
Starting with (b), the harder one: There are a few ways to relate objects. Your choice a string-typed column containing the related object id, is intuitive (especially if you have an SQL background), but the least advisable. The better (best) way to model a one-to-one or small one-to-many relation is with a pointer (or array of pointers if one-to-many).
So I think your senderId and recipientId string columns should be replaced by pointer-typed columns called sender and recipient. The huge advantage of this is the ability to eagerly fetch those pointed-to objects on the message (or "lean" in your terms) query.
Having made that change, you're new improved query looks like this:
PFQuery *query = [PFQuery queryWithClassName:#"lean"];
// notice the first change for the better here:
[query whereKey:#"recipient" equalTo:[PFUser currentUser]];
[query orderByDescending:#"createdAt"];
// notice the really valuable feature here:
[query includeKey:#"sender"];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
// using the array of PFObjects understanding from your other question...
for (PFObject *pfObject in objects) {
NSString *messageBody = [pfObject objectForKey:#"messageBody"];
// these lines here are the punch line:
PFUser *sender = [pfObject objectForKey:#"sender"];
NSString *senderName = [sender username];
NSLog(#"The message %# was sent by %#", messageBody, senderName);
}
}];
The important thing to notice above is that we were able to ask resulting objects for the #"sender" column, and, because you've changed it to a pointer, and because you've done an includeKey on the query, that complete object (e.g. including the PFUser username) is now fetched.
Now the easy question (a). Now that you have the data right from the server, the datasource for the table is nothing more than the returned objects. In other words, throw away the the senderIds array and replace it with:
#property(nonatomic, strong) NSArray *messages;
Your find block becomes trivial:
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
self.messages = objects;
}];
Answer messages.count for numberOfRowsInSection, and then pick what you need from the objects in cellForRowAtIndexPath...
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
PFObject *message = self.messages[indexPath.row];
NSString *messageBody = [message objectForKey:#"messageBody"];
PFUser *sender = [message objectForKey:#"sender"];
NSString *senderName = [sender username];
cell.textLabel.text = senderName;
return cell;
}
function findObjectByKey(array, key, value) {
for (var i = 0; i < array.length; i++) {
if (array[i][key] === value) {
return array[i];
}
}
return null;
}
var obj = findObjectByKey(objArray, 'id', 3);
//ES6
var obj = objArray.find(function (obj) { return obj.id === 3; });
function getObjects(obj, key, val) {
var objects = [];
for (var i in obj) {
if (!obj.hasOwnProperty(i)) continue;
if (typeof obj[i] == 'object') {
objects = objects.concat(getObjects(obj[i], key, val));
} else if (i == key && obj[key] == val) {
objects.push(obj);
}
}
return objects;
}
var result = getObjects(obj, 'category_id', valu.category_id);
console.log(result);
This question already has an answer here:
Pass data from Parse tableview to WatchKit
(1 answer)
Closed 8 years ago.
I'm using Parse to create this table view, and am trying to figure out how to get the Parse table data into an array, so I can pass it into the WatchKit InterfaceController to show the exact same thing?
So I want to show in the WatchKit interface exactly what shows in the iPhone interface.
Here is what I have, let me know if I can add anything that would be helpful:
TableVC.m:
- (id)initWithCoder:(NSCoder *)aCoder
{
self = [super initWithCoder:aCoder];
if (self) {
self.parseClassName = #"na";
self.textKey = #"dateTime";
self.pullToRefreshEnabled = YES;
self.paginationEnabled = NO;
}
return self;
}
- (PFQuery *)queryForTable
{
PFQuery *query = [PFQuery queryWithClassName:self.parseClassName];
return query;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath object:(PFObject *)object
{
static NSString *simpleTableIdentifier = #"RecipeCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
}
UILabel *homeLabel = (UILabel*) [cell viewWithTag:101];
homeLabel.text = [object objectForKey:#"test"];
UILabel *dateLabel = (UILabel*) [cell viewWithTag:102];
dateLabel.text = [object objectForKey:#"dateTime"];
return cell;
}
Parse data:
TableVC.m:
I already have the basic WatchKit files and Storyboard set up. I hard coded an array to test that it was generally working. But now I just need to get the data from Parse into there, and not sure if I need to do a query and then turn that into a public array?
EDIT:
Here is my query:
PFQuery *query2 = [PFQuery queryWithClassName:#"nba"];
[query2 findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
// The find succeeded.
NSLog(#"Objects 2: %#", objects);
}
} else {
// Log details of the failure
NSLog(#"Error 2: %# %#", error, [error userInfo]);
}
}];
Here is my NSLog:
NSLog(#"Objects 2: %#", objects);
Console:
2015-02-09 21:06:30.845 SimpleTable[8373:1284663] Objects 2: (
"<na: 0x7ff3f8e40880, objectId: cOrjeAmwJh, localId: (null)> {\n away = Cav;\n date = \"04/19/2015\";\n dateTime = \"April 19, 2015, 16:00\";\n gNumber = 1;\n home = Bul;\n matup = \"Ca\";\n ro = \"Ro \";\n test = \"Test 2\";\n tv = T;\n}",
If you need the array, fetch it asynchronously in a method outside of the queryForTable method, get it like this:
PFQuery *query = [self queryForTable];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
// objects is the array for this table
NSMutableArray *array = [#[] mutableCopy];
for (PFObject *object in objects) {
NSLog(#"we got an object with dateTime = %#", [object objectForKey:#"dateTime"]);
[array addObject:[object objectForKey:#"dateTime"]];
// you can prove this with any of your keys: away, number, home, mat up, etc.
}
}
}];
if you just want to pass the objects into an array you can do so like this or a variation of:
- (PFQuery *)queryForTable
{
PFQuery *query = [PFQuery queryWithClassName:self.parseClassName];
self.someArray = [query findObjects];
return query;
}
REFERNECE
I currently have my system set up through parse.com
What Im trying to do is to be able to in a tableView or a PFQuerTableViewController be able to query the post which is a PFObject that my user has posted. Currently I have this code below and its only saying "Loading.." instead of displaying their postings. Why is it not displaying my user's last posts?
This is the query in which Im trying to fetch the users post:
- (PFQuery *)queryForTable {
PFQuery *postQuery = [PFQuery queryWithClassName:#"New"];
[postQuery whereKey:#"author" equalTo:[PFUser currentUser]];
// Run the query
[postQuery findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
//Save results and update the table
postArray = objects;
[self.tableView reloadData];
}
}];
}
And here is its cell:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath object:(PFObject *)object {
// If you want a custom cell, create a new subclass of PFTableViewCell, set the cell identifier in IB, then change this string to match
// You can access any IBOutlets declared in the .h file from here and set the values accordingly
// "Cell" is the default cell identifier in a new Master-Detail Project
static NSString *CellIdentifier = #"Cell";
PFTableViewCell *cell = (PFTableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[PFTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// Configure the cell
//cell.textLabel.text = [object objectForKey:self.textKey];
//cell.imageView.file = [object objectForKey:self.imageKey];
PFObject *post = [postArray objectAtIndex:indexPath.row];
[cell.textLabel setText:[post objectForKey:#"title"]];
return cell;
}
Also here is the code for how I am posting the PFObject:
-(IBAction)done:(id)sender {
PFUser *user = [PFUser currentUser];
PFObject *quoteNew = [PFObject objectWithClassName:#"New"];
[quoteNew setObject:user forKey:#"user"];
[quoteNew setObject:[[self quoteText] text] forKey:#"quoteText"];
[quoteNew setObject:[[self attributionTitle] text] forKey:#"title"];
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.mode = MBProgressHUDModeIndeterminate;
hud.labelText = #"Uploading";
[hud show:YES];
[quoteNew saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
if (!error) {
//[self done:self];
[hud hide:YES];
[self dismissViewControllerAnimated:YES completion:nil];
} else {
[hud hide:YES];
}
}];
You're trying to run the query in the queryForTable method. That's not what it's for. In queryForTable, you're supposed to build the query with the constraints that you want (like the author thing that you added) then return the query. So for your case:
- (PFQuery *)queryForTable {
PFQuery *postQuery = [PFQuery queryWithClassName:#"New"];
[postQuery whereKey:#"author" equalTo:[PFUser currentUser]];
// Don't run the query, return it so PFQueryTableViewcontroller can use it
return postQuery;
}
If you want to programmatically tell your PFQueryTableViewController to load new posts, you can run [self loadObjects].
Note: This only applies if you are subclassing PFQueryTableViewController
I'd recommend reading the documentation, it lays everything out fairly well here.
You are setting the key as user
[quoteNew setObject:user forKey:#"user"];
Then querying for author
[postQuery whereKey:#"author" equalTo:[PFUser currentUser]];
Try instead
[postQuery whereKey:#"user" equalTo:[PFUser currentUser]];
I'm sitting on this almost 4 days and I can't find the problem (already searched google a lot and tried everything but nothing helped). I have this table view I created on my storyboard. Everything is connect BUT when I run my code:
First all the tableView method runs but since array still nil nothing happened. Then after my array got all the data and code says [tableView1 reloadData]; nothing happened and I'm not getting to the tableView methods... (I tried to locate the reloadData in many places in my code and nothing worked).
-(void)viewDidLoad {
[super viewDidLoad];
self.tableView1.dataSource=self;
self.tableView1.delegate=self;
self.tripNamesList = [[NSMutableArray alloc] init];
[self GetTripsList];
PFQuery *query = [PFQuery queryWithClassName:#"Trips"];
NSString *userID = user.objectId;
[query whereKey:#"User_Created_ID" equalTo:userID];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
NSLog(#"Successfully retrieved %d trips.", objects.count);
[self.tripNamesList addObjectsFromArray:objects];
NSLog(#"%#", tripNamesList);
for (PFObject *object in objects) {
NSLog(#"%#", object.objectId);
[self.tripNamesList addObject:object ];
}
[tableView1 reloadData];
}
else {
// Log details of the failure
NSLog(#"Error: %# %#", error, [error userInfo]);
}
}];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [self.tripNamesList count];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(#"Calling 1222rrgdfghgfhdgfdfgfdgdfgd on %#", tableView);
static NSString *CellIdentifier = #"TripCell";
UITableViewCell *cell = [self.tableView1 dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] ;
}
PFObject *obj2 = [self.tripNamesList objectAtIndex:indexPath.row];
PFQuery *query = [PFQuery queryWithClassName:#"Trips"];
PFObject *searchedItems = [query getObjectWithId:obj2.objectId];
NSString *tempTripName = [searchedItems objectForKey:#"Trip_Name"];
cell.textLabel.text = tempTripName;
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
[self.tableView1 reloadData];
return cell;
}
#end
Try running the reloadData from the main thread:
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
NSLog(#"Successfully retrieved %d trips.", objects.count);
[self.tripNamesList addObjectsFromArray:objects];
NSLog(#"%#", tripNamesList);
for (PFObject *object in objects) {
NSLog(#"%#", object.objectId);
[self.tripNamesList addObject:object ];
}
dispatch_sync(dispatch_get_main_queue(), ^{
[self.tableView1 reloadData];
});
}
else {
// Log details of the failure
NSLog(#"Error: %# %#", error, [error userInfo]);
}
}];
You dont need to call [tableView reloadData] everywhere. Once this method is called, the tableview's delegates will be called in order like numberOfRowsInSection and based on the number of rows, that much time cellForRowAtIndexPath will be called. So in your case, you have put reloadData in cellForRowAtIndexPath and it will create an infinte loop, I guess.
Also, since you are filling self.tripNamesList in background thread, you can call reloadData in main thread as like below
for (PFObject *object in objects) {
NSLog(#"%#", object.objectId);
[self.tripNamesList addObject:object ];
}
[self performSelectorOnMainThread:#selector(refreshTableData) withObject:nil waitUntilDone:NO];
Yes, for this you need to have a method like this in your .m
- (void) refreshTableData{
[tableView reloadData];
}
Hope this helps.
Try to move your code from viewdidload to viewdidlayout, viewwillappear or viewdidapear, your table might not be initialised yet at that point.
I am trying to search my objects on parse.com using a uisearchbar and performing 'findObjectsInBackgroundWithBlock'. I am getting the correct results in my output but they are not showing up in my table.
I was previously doing this without blocks, my code worked, it got the correct results but moved very slowly and I was getting a warning, "Warning: A long-running Parse operation is being executed on the main thread"
I had previously been using the code:
- (void)filterResults:(NSString *)searchTerm {
[self.searchResults removeAllObjects];
PFQuery *query = [PFQuery queryWithClassName: #"Items"];
[query whereKeyExists:#"itemName"];
[query whereKeyExists:#"itemDescription"];
[query whereKey:#"tags" containsString:searchTerm];
NSArray *results = [query findObjects];
NSLog(#"%#", results);
NSLog(#"%u", results.count);
[self.searchResults addObjectsFromArray:results];
}
So now I am trying findObjectsInBackgroundWithBlock instead, I have not worked with blocks before so this is where I need help, here is my new code:
- (void)filterResults:(NSString *)searchTerm {
[self.searchResults removeAllObjects];
PFQuery *query = [PFQuery queryWithClassName: #"Items"];
[query whereKey:#"tags" containsString:searchTerm];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
NSLog(#"%#", objects);
NSLog(#"%u", objects.count);
[self.searchResults addObjectsFromArray:objects];}];
Here is some more of my code
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if (tableView == self.tableView) {
return self.objects.count;
} else {
return self.searchResults.count;
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath object:(PFObject *)object {
NSString *uniqueIdentifier = #"cell";
HomeCell *cell = nil;
cell = (HomeCell *) [self.tableView dequeueReusableCellWithIdentifier:uniqueIdentifier];
if (!cell) {
NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:#"HomeCell" owner:nil options:nil];
for (id currentObject in topLevelObjects)
{
if([currentObject isKindOfClass:[HomeCell class]])
{
cell = (HomeCell *)currentObject;
break;
}
}
}
if (tableView != self.searchDisplayController.searchResultsTableView) {
NSString *itemName = [object objectForKey:#"itemName"];
NSString *itemDescription = [object objectForKey:#"itemDescription"];
//cell.textLabel.text = last;
cell.cellTitleLabel.text = itemName;
cell.descriptionLabel.text = itemDescription;
cell.priceLabel.text = [object objectForKey:#"price"];
PFFile *thumbnail = [object objectForKey:#"imageFile"];
PFImageView *thumbnailImageView = cell.imageFile;
thumbnailImageView.image = [UIImage imageNamed:#"Facebook #2x.png"];
thumbnailImageView.file = thumbnail;
[thumbnailImageView loadInBackground];
}
if ([tableView isEqual:self.searchDisplayController.searchResultsTableView]) {
PFObject *obj2 = [self.searchResults objectAtIndex:indexPath.row];
PFQuery *query = [PFQuery queryWithClassName:#"Items"];
PFObject *searchedItems = [query getObjectWithId:obj2.objectId];
NSString *itemName = [searchedItems objectForKey:#"itemName"];
NSString *itemDescription = [searchedItems objectForKey:#"itemDescription"];
cell.cellTitleLabel.text = itemName;
cell.descriptionLabel.text = itemDescription;
cell.priceLabel.text = [searchedItems objectForKey:#"itemName"];
PFFile *thumbnail = [searchedItems objectForKey:#"imageFile"];
PFImageView *thumbnailImageView = cell.imageFile;
thumbnailImageView.image = [UIImage imageNamed:#"Facebook #2x.png"];
thumbnailImageView.file = thumbnail;
[thumbnailImageView loadInBackground];
}
return cell;
Any help would be greatly appreciated,
cheers
In order to update the table view, you need to call the reloadData: method once you have added the new search results. Make sure that you call this method within the block that you provide to findObjectsInBackgroundWithBlock: because this block of code will be run on a separate thread. This causes the method to return instantly, and code after this method will then run before the block has actually executed. Your find objects code within filterResults: should look something like this:
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
// This block is called from a background thread once the query has been executed
NSLog(#"%#", objects);
NSLog(#"%u", objects.count);
[self.searchResults addObjectsFromArray:objects];
// Refresh the table view on the main thread
dispatch_async(dispatch_get_main_queue(), ^{
[self.tableView reloadData];
[self.searchDisplayController.searchResultsTableView reloadData];
});
}];
Differentiate from your search table view and your regular tableview when you create the cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath object:(PFObject *)object {
if (tableView = self.tableView) {
//Configure your cell normally
}
else {
//Configure your cells using
cell.someAttribute = self.searchResults[indexPath.row].someAttribute;
}