Reload TableView from different ViewController using Objective-C - ios

Question

I'm not sure about how to achieve this and hence i'm asking this question.
I have 2 ViewController(VC) named abVC and xyVC.
abVC contains only TableView and xyVC contains only a button.
When i tap a button on xyVC, it should reload tableview inside abVC without moving to that abVC.
Is it possible ? If yes.. then please help me,How to do that?

Answer 1

You can do it with both block and NSNotification.
With block you can implement it as follows:
make a property as follows in xyzVC.h:
#property(strong,nonatomic)void(^callBack)();
Synthesize this property in xyzVC.m
#synthesize callBack
Call this block in Buttons click event
- (IBAction)btnClick:(UIButton *)sender {
if (callBack)
{
callBack();
}
}
Implement it in abcVC where you want call back:
[abVC setCallBack:^{
//reload your tableview here
}];
With NSNotification you can implement it as follows:
Register for receiving notification in abcVC.m
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(reloadTableView) name:#"ReloadTable" object:nil];
- (void)reloadTableView{
// Reload your tableview here
}
Now post the notification from xyzVC
- (IBAction)btnClick:(UIButton *)sender {
[[NSNotificationCenter defaultCenter] postNotificationName:#"ReloadTable" object:nil];
}
Note: If you are using NSNotification then don't forget to remove it when your view controller is dismissed
I hope this will help you :)

Answer 2

Add this line in your button action method
[[NSNotificationCenter defaultCenter] postNotificationName:#"ReloadTable" object:nil];
Add this code where you have implemented table, so in abVC:
inside viewDidLoad:
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(reloadTableViewData) name:#"ReloadTable" object:nil];
Add following method
- (void)reloadTableViewData{
[self.myTableView reloadData];
}
Implement dealloc method (to prevent crash)
- (void)dealloc{
[[NSNotificationCenter defaultCenter] removeObserver:self name:#"ReloadTable" object:nil];
}