How to get Parse.com object count in class - ios

Question

I want to get the object count from 5 classes in Parse.com (to check if all objects were fetched successfully).
Because I'm using findObjectsInBackgroundWithBlock: sometimes not all the objects are fetched before I'm using it, that's why I want to check.
How can I do that?

Answer 1

Update 2: just noticed you were asking about iOS. its basically the same principle, use fetchAllIfNeeded like so:
https://parse.com/docs/ios/api/Categories/PFObject(Synchronous).html#/c:objc(cs)PFObject(cm)fetchAllIfNeeded:
Update: a better way than the naive one (below) would probably be using fetchAllIfNeededInBackground:
ArrayList<ParseObject> objectsToFetch = new ArrayList<>();
objectsToFetch.add(object1);
objectsToFetch.add(object2);
objectsToFetch.add(object3);
ParseObject.fetchAllIfNeededInBackground(objectsToFetch, new FindCallback<ParseObject>() {
#Override
public void done(List<ParseObject> objects, ParseException e) {
//all are fetched, do stuff
}
});
My native way of doing this is adding an outer boolean array where each boolean is responsible for one of the classes.
When a findObjectsInBackgroundWithBlock's 'done' function runs, I set that boolean to "true" and run a function that checks whether all array is true, if so -> all classes have been fetched and I can continue.
example from my code:
boolean[] itemFetched;
protected void getAllClassesAndDoStuffWithThem() {
itemFetched= new boolean[NUM_OF_CLASSES];
for (int i=0;i<NUM_OF_CLASSES;i++){
final int finalI = i;
itemFetched[i] = false;
parseObjectArray[i].fetchIfNeededInBackground(new GetCallback<ParseObject>() {
#Override
public void done(ParseObject object, ParseException e) {
itemFetched[finalI] = true;
finishInitIfPossible();
}
});
}
}
private void finishInitIfPossible() {
for (int i=0;i<NUM_OF_CLASSES;i++){
if (!itemFetched[i])
return;
}
//all classes fetched
finishInit();
}
private void finishInit() {
//do stuff with all 5 classes
}