Get Data from Tableview to Viewcontroller containing Tableview - ios

Question

I try to pass data between two tableviews ,for example once the person tap on a row in the first tableview you will see more data in the 2nd tableview .Actually the application runs but there is no data in the second tableview .

Answer 1

Does your header label appear? Then the problem can be narrowed down to PFFile object stuffs.
First of all, you should make sure that any images you want to display are downloaded and stored in the memory from Parse server. When it comes to Parse object, PFFile (image) is just a reference to the actual file in the Parse server. Therefore, you should download the actual image before you use it locally like setting it in an image view.
To get a single image PFFile from the server:
PFFile *file = dictionary[#"thumbnail"];
[file getDataInBackgroundWithBlock:^(NSData *thumbnailData, NSError *error) {
if (!error) { // downloaded successfully
UIImage *image = [UIImage imageWithData:thumbnailData];
....
}
}
In your case, it seems that multiple images are stored in the newspaper array, so all of them must be downloaded first if you want to access one of them. Reload the second table view data then.
Prepare 'dictionaryOfNewspaperImage' and override viewDidAppear method in your second vc like below:
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
for (int i = 0; i < [self.arrayofnewspaper count]; i++) {
PFFile *file = self.arrayofnewspaper[i];
[file getDataInBackgroundWithBlock:^(NSData *imageData, NSError *error) {
if (!error) {
UIImage *image = [UIImage imageWithData:imageData];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:1];
[self.dictionaryOfNewspaperImage setObject:image forKey:indexPath];
[self.tableView reloadRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationNone];
}
}
}
}
And your cell configuration part should seem like this:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
....
cell.imageView.image = self.dictionaryOfNewspaperImage[indexPath];
....
return cell;
}
Not quite sure if it's reliable to use NSIndexPath as a key and there should be better approach than this, but you'll get the idea. Get the file from Parse first and reload relevant rows later.

Answer 2

When you change the data source for the second table, you need to notify the table of the change by calling its reloadData method.
In this case it might be
destviewcontroller.arrayofnewspaper=[object objectForKey:#"newspaper"];
[destviewcontroller.table reloadData];