Method doesn't work when transferred to another Class - ios

Question

I have a method in my "MasterView" () class that parses .json data from a URL then populates a table view with the information. In order to be more organized and group the method with other needed methods I attempted to move it into another NSOject class but it didn't work; no errors, no exceptions the table view simply doesn't populate.
Here is the original method in the "Master Class"
- (void) fetchPosts:
{
NSError *error;
NSData *responseData = [NSData dataWithContentsOfURL:myURL];
NSDictionary *json = [NSJSONSerialization
JSONObjectWithData:responseData
options:kNilOptions
error:&error];
NSArray *objects = [[json objectForKey:#"data"] objectForKey:#"children"];
arr = [[NSMutableArray alloc] init];
for (NSDictionary *object in objects) {
NSString *title = [[object objectForKey:#"data"] objectForKey:#"title"];
//Post is just a random NSObject Class
Post *post = [[Post alloc] init];
post.title = title;
[arr addObject:post];
}
NSLog(#"Called");
[self.tableView reloadData];
}
The Edited Method in the other class:
- (void) fetchPosts:(NSURL *)myURL withPostArray:(NSMutableArray*)postArr andTableView: (UITableView*)tableView
{
NSLog(#"CAlled");
NSError *error;
NSData *responseData = [NSData dataWithContentsOfURL:myURL];
NSDictionary *json = [NSJSONSerialization
JSONObjectWithData:responseData
options:kNilOptions
error:&error];
NSArray *objects = [[json objectForKey:#"data"] objectForKey:#"children"];
postArr = [[NSMutableArray alloc] init];
for (NSDictionary *object in objects) {
NSString *title = [[object objectForKey:#"data"] objectForKey:#"title"];
Post *post = [[Post alloc] init];
post.title = title;
[postArr addObject:post];
}
[tableView reloadData];
}
The original Method that works is called: [self fetchPosts:]; the other is: [MyClass fetchPosts:myUrl withPostArray:arr andTableView:self.tableView];
I edited some information out to make it more readable so please let me know if there is any mistakes.
MyClass.h:
#interface MyClass : NSObject <UITableViewDelegate, UITableViewDataSource>
Setting the datasource in MasterView:
//In ViewDidLoad
_delegate = myClass;
self.tableView.dataSource = _delegate;
self.tableView.delegate = _delegate;
//In .h
#property (strong, nonatomic) MyClass *delegate;
Im getting nothing from the compiler when I call [MyClass fetchPosts:myUrl withPostArray:arr andTableView:self.tableView];

Answer 1

If the table view doesn't populate, then the table view is not getting the needed data through the data source.
It's possible that you didn't set the dataSource of your tableView to the new NSObject you created, or that MasterView is still the dataSource of the tableView.
Also, make sure that this method is actually called and the passed tableView is the one presented in the view.
Edit: You have three solutions:
Assign the data source to the new object you created so it handles updating the table view with data, since it now has the actual data.
Adjust that method to return the parsed data to the MasterView and it calls [self.tableView reloadData]. But this is not really good from MVC's point of view.
The third option requires you to create a UIVieController to handle your MasterView and it should be the dataSource for the table view. The view controller should call the said method from the new object, to retrieve the data and update the table view. i.e. like the 2nd solution, but a view controller will call the method and not the MasterView.