Issue reloading cellForRowAtIndexPath - Objective C - ios

Question

I am having an issue reloading my tableView when calling from an outside class to start a method and reload the tableView
More specifically:
Here is the call from the outside class:
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
NSInteger tag = cell.tag;
impact* myScript = [[impact alloc] init];
[myScript startProcess:tag];
}
**From here** it moves to the `impact` class and loads the `startProcess` method:
- (void)startProcess:(NSInteger)number {
NSInteger testing = number;
cellID = testing;
// MAKE REQuEST TO SERVER
[self makeRequests];
dispatch_async(dispatch_get_main_queue(), ^{
[self.tableView reloadData];
});
}
This is the makeRequests method it calls:
-(void)makeRequests
{
/* GRAB USERNAME TO BE SENT OVER FOR NOTIFICATIONS */
NSArray *get = [[SSKeychain allAccounts] init];
//NSLog(#"get%#", get);
NSString *username = [get[0] objectForKey:#"acct"];
//if(cellID != 0)
//{
NSDictionary *dictionary = #{#"function": #"populateNotfications", #"username" : username};
NSError *error = nil;
NSData *data = [NSJSONSerialization dataWithJSONObject:dictionary options:0 error:&error];
NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
if (error)
NSLog(#"%s: JSON encode error: %#", __FUNCTION__, error);
NSURL *url = [NSURL URLWithString:#"test.com/dev/iphone/test.php"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:#"POST"];
NSString *params = [NSString stringWithFormat:#"json=%#",
[string stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSData *paramsData = [params dataUsingEncoding:NSUTF8StringEncoding];
[request addValue:#"8bit" forHTTPHeaderField:#"Content-Transfer-Encoding"];
[request addValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request addValue:[NSString stringWithFormat:#"%lu", (unsigned long)[paramsData length]] forHTTPHeaderField:#"Content-Length"];
[request setHTTPBody:paramsData];
// issue the request
NSURLResponse *response = nil;
NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
if (error)
NSLog(#"%s: NSURLConnection error: %#", __FUNCTION__, error);
// GRAB STATUS OBJECT
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:returnData //1
options:kNilOptions
error:&error];
self.impactsGrabed = [json objectForKey:#"requested_data"];
//}
}
Now from here it will run my tableView methods as shown below:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [self.impactsGrabed count];
}
- (double) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 75;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"timelineCell";
impactTimelineCell *cell = (impactTimelineCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
cell = [[impactTimelineCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
[cell initTimelineCell];
cell.statusLabel.text = [self.impactsGrabed[indexPath.row] objectForKey:#"message"];
cell.timestampLabel.text = [self.impactsGrabed[indexPath.row] objectForKey:#"time_post"];
return cell;
}
I have logged every method and every method works until I hit cellForRowAtIndexPath where nothing happens than. Nothing is returning void. Now heres the thing:
When calling the function startProcess from another class that starts the whole process of loading the tableView cells it does not work. If I call the startProcess method inside the viewDidLoad in that file on initiation the tableView cells load properly.
So for example:
If I place [self startProcess:1]; within the viewDidLoad it works perfect! If I call [myScript startProcess:tag]; from the other class, it wont work properly.
What do you guys think the issue is?

Answer 1

Since all your controller are already instantiated and on screen, you don't need to instantiate one (and indeed you shouldn't since that creates a new instance that's not on screen).
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
NSInteger tag = cell.tag;
impact* myScript = self.parentViewController.childViewControllers[1]; // if my script is one of the child view controllers, then this is how you need to access it -- the number might be 0,1 or 2 depending on which one is the impact controller
[myScript startProcess:tag];
}
You can also do this in prepareForSegue -- when your controller is instantiated, all the embedded child controllers will also be, and you can get a reference to them from the destinationViewController property of the segue.
Because this controller is already on screen, it's ok to call reloadData where you do in startProcess.