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How do you reload a particular cell in UITableView Swift?

How do you reload a particular cell in UITableView Swift?

3 Answers

  1. what is rowNumber ? –
  2. @Kristoff declaration is func reloadRows(at indexPaths: [IndexPath], with animation: UITableViewRowAnimation), where indexPath is an array of NSIndexPath objects identifying the rows to reload. –
  3. @Kristof rowNumber means which number of cell you to want to reload.

How can I tell if my UITableView has finished reloading data?

[self. tableView reloadData] NSIndexPath* indexPath = [NSIndexPath indexPathForRow: ([self. tableView numberOfRowsInSection:([self.

How do you reload a section in UITableView Swift 4?


  1. UITableView.reloadData() will reload all the table.
  2. UITableView.reloadSections(_ sections: IndexSet, with animation: UITableViewRowAnimation) will reload specific section( including section header and section footer).

How do you refresh a cell in tableView?

Reload UITableView row/cell at IndexPath

  1. Step 1: Setup UITableView. If you want to jump straight to reloading cells at an IndexPath then you might want to skip to Step 2. I am starting with a completely blank project, so everything I do will be done in my default ViewController .
  2. Step 2: Reload cell at IndexPath. We now have almost everything we need.

How do you refresh a cell in Swift?

reload cell data in table view with Swift

  1. you can get Array of visible Cell by using TableView Function tableView.visibleRows() or You Can Get IndexPath of Visible Rows By tableView.indexPathsForVisibleRows() !
  2. look at this example – Saurabh Prajapati Nov 3 ’14 at 8:32.

How do I update cells in Swift?

3 Answers. If You want to update cell content size, You should use beginUpdates() and endUpdates() to change content size of UITableViewCell, in this case heightForRowAtindexPath will called for each cell in tableView and update height of TableviewCell.

How do you use reloadRows?

reloadRows method. When the button in the target cell is tapped, this method is called. When this method called, the target cell [section = 0, row = 0] is not reloaded, but the tableview is scrolled and other cells [(section = 0, row = 2),(section = 0, row = 3)] are reloaded.

How do I reload a view in Swift?

above is the link to the picture View Controller Lifecycle. viewWillAppear()—Called just before the view controller’s content view is added to the app’s view hierarchy. Use this method to trigger any operations that need to occur before the content view is presented onscreen.

How do I reload Subviews?

1 Answer. You can create a delegate relationship between your UIVIew and UIViewController classes. Then add the proper code inside delegate methods to reload the UIVIew. Otherwise you can call setNeedsDisplay on your view thereby you’re forcing it to redraw.

What is layoutIfNeeded in Swift?

— layoutIfNeeded() In contrast, the method layoutIfNeeded is a synchronous call that tells the system you want a layout and redraw of a view and its subviews, and you want it done immediately without waiting for the update cycle.

How do I refresh a storyboard in Swift?

Open your storyboard (make sure it is in the active tab), then uncheck Editor > Automatically Refresh Views. This will stop Xcode from automatically building the storyboard every time you change your code. You can enable it back as needed when you are done with your code, to see the updated visual preview.

How do I run a main thread in Swift?

How to run a piece of code on main thread in Swift 4

  1. func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { }
  2. DispatchQueue. main. async{ //put your code here }
  3. self. tableView?. reloadData()
  4. DispatchQueue. main. async{ self. tableView. reloadData() }

How do I remove all Subviews from a view in Swift?

How to remove all subviews of a view in Swift?

  1. Simple For Loop. for subView in containerView.
  2. ForEach Loop. containerView.
  3. Using Map Function. containerView.
  4. Making Extension.
  5. Going Universal with Generics.
  6. The Same but Using Filter and Map Functions.

Why viewWillAppear is not called?

The Simple Answer. The technical reason for when viewWillAppear gets called is simple. Notifies the view controller that its view is about to be added to a view hierarchy. It can’t be any view hierarchy — it has to be the one with a UIWindow at the root (not necessarily the visible window).

What is the difference between viewDidLoad and viewWilLAppear?

viewDidLoad: Whatever processing you have that needs to be done once. viewWilLAppear: Whatever processing that needs to change every time the page is loaded.

How many times is viewDidAppear called?

If I pop this view off the stack and navigate to it again, viewDidAppear: invokes only once per appearance. All subsequent appearances invoke viewDidAppear: once.

What is called before viewDidLoad?

Yes, viewDidLoad method is called before viewDidAppear:.

Which is called first viewDidLoad or viewDidAppear?

viewDidLoad is called once when the controller is created and viewDidAppear is called each time the view, well, DID appear. So say you have a modal view that you present, when that view is dismissed, viewDidAppear will be called, and viewDidLoad will not be called.

What is viewDidLayoutSubviews in Swift?

As name suggests, viewDidLayoutSubviews is called when the view of your viewController has just finished its laying out and you can assume that at that point your views are in their correct places/ frame s according to your autolayout constraints.

Is viewDidLoad only called once?

viewDidLoad() is called before anything is shown to the user – and it is called only once. It gives your app a chance to set some initial configuration in the view, and do some other minor tasks before the view is shown to the user for the first time.

How many times viewDidLayoutSubviews called?

Meaning the method viewDidLayoutSubviews is called every time the view size changes and the view layout has been recalculated.

What is viewDidLoad in Swift?

viewDidLoad is the method that is called once the MainView of a ViewController has been loaded. This is called after loadView is called.In the image you can see the MainView and other views within it.

What does super mean in Swift?

When one class inherits from another, the inheriting class is known as a subclass, and the class it inherits from is known as its superclass. Inheritance is a fundamental behavior that differentiates classes from other types in Swift.

What is the difference between frame and bounds in Swift?

At its simplest, a view’s bounds refers to its coordinates relative to its own space (as if the rest of your view hierarchy didn’t exist), whereas its frame refers to its coordinates relative to its parent’s space. Remember, the bounds is relative to the view’s own space, and internally to the view nothing has changed.

What is view controller life cycle in Swift?

This method is called only once in the lifetime of a view controller, so you use it for things that need to happen only once. If you need to perform some task every time a view controller comes on screen, then you need the following methods. Keep in mind that in this lifecycle step the view bounds are not final.

Which is the first method called when view controller is loaded?

viewDidLoad: This Method is loaded once in view controller life cycle . Its Called When all the view are loaded .

What is view life cycle?

View Life Cycle Every Activity has it’s own life cycle similarly Views also have a Life Cycle. A view which was rendered on the screen must undergo these lifecycle methods to get drawn on the screen correctly. Each of these methods has its importance. Let’s dive into the life cycle.

What is the life cycle stage of Swift?

The Product Lifecycle Concept is well known for a long time both in studies of general economy and management. As per the concept; every product launched has a predictable lifecycle and it goes through 4 stages – introduction, growth, maturity and decline.

What is the first method in the view controller lifecycle?

viewWillLayoutSubviews: This is the first place to learn the bounds of the view in the lifecycle. This is called also right before the layoutSubviews method is triggered in UIView. This is also called when the subviews of the root view are loaded.