Reloading a ViewController - ios

Question

I have a View controller displaying some information (not table views).
I have an update call to a remote server which fills my data base. I would like to completely reload my ViewController after the update call is done.
What should I do?

Answer 1

If you know your database has been updated and you want to just refresh your ViewController (which was my case). I didn't find another solution but what I did was when my database updated, I called:
[self viewDidLoad];
again, and it worked. Remember if you override other viewWillAppear or loadView then call them too in same order.
like.
[self viewDidLoad];
[self viewWillAppear:YES];
I think there should be a more specific solution like refresh button in browser.

Answer 2

If you want to reload a ViewController initially loaded from a XIB, you can use the next UIViewController extension:
extension UIViewController {
func reloadViewFromNib() {
let parent = view.superview
view.removeFromSuperview()
view = nil
parent?.addSubview(view) // This line causes the view to be reloaded
}
}

Answer 3

You really don't need to do:
[self.view setNeedsDisplay];
Honestly, I think it's "let's hope for the best" type of solution, in this case. There are several approaches to update your UIViews:
KVO
Notifications
Delegation
Each one has is pros and cons. Depending of what you are updating and what kind of "connection" you have between your business layer (the server connectivity) and the UIViewController, I can recommend one that would suit your needs.

Answer 4

Try this, You have to call both methods to reload view,
as this one works for me,
-Objective-C
[self viewDidLoad];
[self viewWillAppear:YES];
-Swift
self.viewDidLoad()
self.viewWillAppear(true)

Answer 5

Update the data ... change button titles..whatever stuff you have to update..
then just call
[self.view setNeedsDisplay];

Answer 6

Direct to your ViewController again. in my situation [self.view setNeedsDisplay]; and [self viewDidLoad]; [self viewWillAppear:YES];does not work, but the method below worked.
In objective C
UIStoryboard *MyStoryboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil ];
UIViewController *vc = [MyStoryboard instantiateViewControllerWithIdentifier:#"ViewControllerStoryBoardID"];
[self presentViewController:vc animated:YES completion:nil];
Swift:
let secondViewController = self.storyboard!.instantiateViewControllerWithIdentifier("ViewControllerStoryBoardID")
self.presentViewController(secondViewController, animated: true, completion: nil)

Answer 7

It is not advised to call ViewDidLoad or ViewWillAppear by yourself.
In the ViewDidLoad include a loadData() function to prepare the data. This is executed in the initial run.
When you want to reload, call loadData() again to get the data from model. In a tableView call reloadData() or in a regular view setNeedsDisplay().

Answer 8

Reinitialise the view controller
YourViewController *vc = [[YourViewController alloc] initWithNibName:#"YourViewControllerIpad" bundle:nil];
[self.navigationController vc animated:NO];

Answer 9

For UIViewController just load your view again -
func rightButtonAction() {
if isEditProfile {
print("Submit Clicked, Call Update profile API")
isEditProfile = false
self.viewWillAppear(true)
} else {
print("Edit Clicked, Call Edit profile API")
isEditProfile = true
self.viewWillAppear(true)
}
}
I am loading my view controller on profile edit and view profile. According to the Bool value isEditProfile updating the view in viewWillAppear method.

Answer 10

You Must use
-(void)viewWillAppear:(BOOL)animated
and set your entries like you want...