How can i refresh view when i use removefromsuperview method? - ios

Question

I have two view controllers on iOS app.
The first view controller (A), store a table view with cells of data.
When i select a cell, i use the follow method for go to second view controller (B):
if (secondViewController == nil) {
secondViewController = [[SecondViewController alloc] initWithNibName: #"nibName" bundle:nil];
}
[self.view addSubview:secondViewController.view];
When i am in the second view controller (B) and i want come back to first view controller (A) i use the method:
[self.view removeFromSuperview];
And then i come back to first view controller (A).
The problem is:
When i select a different cell in the first view controller (A) i go to the second view controller (B) but this time, with the same data of the previous cell.
The view controller doesnt refresh data automatically...
I tried use the viewWillAppear, but it didnt work so i need a bit help. By the other hand, viewDidAppear doesnt work too of course.
Thanks to all.

Answer 1

The reason it's like that is because you create secondViewController just first time (lazy loading) after that you just add subview:
if (secondViewController == nil) {
secondViewController = [[SecondViewController alloc] initWithNibName: #"nibName" bundle:nil];
}
You can sort it out by doing:
secondViewController = [[SecondViewController alloc] initWithNibName: #"nibName" bundle:nil];
[self.view addSubview:secondViewController.view];
But where do you load the data to your subview. If you want to change the view depending on data you should do something like that:
if (secondViewController == nil) {
secondViewController = [[SecondViewController alloc] initWithNibName: #"nibName" bundle:nil];
}
//Pass some data here
secondViewController.SOMEDATA = YOURDATA;
[self.view addSubview:secondViewController.view];

Answer 2

[viewThatYouWantToRefresh setNeedsDisplay];
or if you need to update the data in the cells on the UITableView:
[tableView reloadData];

Answer 3

I am sure I understood you correctly but I think you can change
if (secondViewController == nil) {
secondViewController = [[SecondViewController alloc] initWithNibName: #"nibName" bundle:nil];
}
to
secondViewController = [[SecondViewController alloc] initWithNibName: #"nibName" bundle:nil];
So you will recreate SecondViewController each time you choose new cell.

Answer 4

Just remove this condition:
if (secondViewController == nil)
i.e no need to check if secondViewController is nil or not. The problem is you are creating secondViewController only once.