Question

wanted to see if somebody can provide some suggestions/pointers on how to address this issue I am currently facing for an iPad app. Here is a link to the graphic that I am describing below
http://www.yogile.com/dsruyzk7/41m/share/?vt=QANtu4j

Basically I have a parentViewController which contains 2 child view controllers. Child 1 has a UITableView and
Child 2 has a custom UIView. I am able to load the info from UITableview on Child 1 to the custom UIView on Child 2 from didSelectRowAtIndexPath. After the data is
displayed on Child 2 I do some processing. After the processing is complete, I need to update the UITableView on Child 1 so that the new/updated data
gets displayed on the UITableView. I tried creating a delegate on Child 1 but wasn’t working maybe I set something wrong. So any help suggestion would be greatly appreciated.

Thanks

.h on Child 2 ViewController

@class Child2ViewController;

@protocol child2Delegate <NSObject>
- (void)refreshTable:(Child2ViewController*)controller passedDict:(NSDictionary *)dict;

@interface Child2ViewController:UIViewController<UITableViewDataSource, UITableViewDelegate> {
    UITableView *myTableView;
    id<child2Delegate> delegate;
    Child1ViewController *child1VC;
}

@property (nonatomic, weak) id<child2Delegate> delegate;
…
…

@end

.m on Child 2 ViewController

@synthesize delegate;
…
..
..
#after all the processing is done we are ready to refresh the view
#updatedDictForTableView is basically a NSDictionary and has the updated data needed
#for the UITableview on child1VC.

-(void)processData {
    child1VC.delegate = self
    NSLog(@"Dump the updated Data : %@", updatedDictForTableView);
    [delegate refreshTable:self passedDict:updatedDictForTableView;
}

.h in Child1 ViewController

@interface Child1ViewController : UIViewController <child2Delegate> {
    ….
    ….
    ..
}

.m in Child1 ViewController

- (void)refreshTable:(Child2ViewController*)controller passedDict:(NSDictionary *)dict {
    NSLog(@"dump dict %@", dict);
    [myTableView reloadData];

}

Answer 1

You can do that without delegate, use NSNotificationcenter to send a notification with your values in the nsdictionary: exple :

  // in child1 ( in viewDiDLoad function )
 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(FunctionToReloadData:) name:@"ProcessDone" object:nil];

  // remove the listnerin child1 ( in viDidUnload )
[[NSNotificationCenter defaultCenter] removeObserver:self forKeyPath:@"ProcessDone"];

 //in child2 ( in the end of your processData function )
 [[NSNotificationCenter defaultCenter] postNotificationName:@"ProcessDone" object:nil userInfo:updatedDictForTableView ];


 //in child1
 -(void) FunctionToReloadData:(NSNotification *)notification
 {
    // get the sended dictionary
    NSDictionary *tmpDic = [notification userInfo];
     .
     .
     [tableView reloadData];

 }