CODEWITHSUNDEEP
iosobjective-c
rmon2852
rmon2852

Reputation: 220

Reload a UICollectionView from a UICollectionViewCell

I have a UICollectionView and within this I have a custom UICollectionViewCell which has a button with an action attached to it. The action deletes the object from core data.

I am then wanting to perform a [self reloadData]. But how would I call this method from within the UICollectionViewCell Class?

Upvotes: 1

Views: 237

Answers (3)

jamryu
jamryu

Reputation: 698

This is a Swift 4+ version of J. Lopes's answer:

Place this inside the IBAction of your UICollectionViewCell:

NotificationCenter.default.post(name: Notification.Name(rawValue: "notification_name"), object: nil)

Place this inside the viewDidLoad() of the receiving class:

NotificationCenter.default.addObserver(self, selector: #selector(reloadDataNow), name: Notification.Name(rawValue: "notification_name"), object: nil)

And this is the function you want to trigger in the receiving class once IBAction is pressed from the UICollectionViewCell:

@objc func reloadDataNow(_ notification: Notification) {
    self.yourCollectionView.reloadData()
}

Upvotes: 0

Sudhir
Sudhir

Reputation: 127

You can create delete or notification in UIViewController and in cellforItemAtindexPath set that delegate to UIViewController. In button action inside UICollectionViewCell performing operation (deletes the object) and call delegate

when receiving delegate callback in UIViewController perform [collectionView reload];

Upvotes: 0

J. Lopes
J. Lopes

Reputation: 1345

Yes you can call it in your IBAction inside of your UICollectionViewCell:

[[NSNotificationCenter defaultCenter] postNotificationName:@"notification_name" object:nil];

Inside of the class you want to reload, you can put this in viewDidLoad:

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(reloadDataNow)
                                             name:@"notification_name"
                                           object:nil];

Inside of the same class you want to reload create this new method reloadDataNow

- (void)reloadDataNow {
    [self.yourCollectionView reloadData];
}

I hope this can help you.

Upvotes: 2

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