Uitableview reloaddata keep scroll position swift. func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat { return 'your maximum cell's height' } and your tableView will remain on the previous scroll position without scrolling Oct 12, 2016 · OperationQueue. First we need a tableview backed up some API data that changes often. tableView. Marks the table view as needing redisplay, so it will reload the data for visible cells and draw the new values. Create a subclass of UITableView:. row < self. indexPathsForVisibleRows()! and then you can reload table by tableView. addOperation({ -> Void in self. Call this method to reload all the data that’s used to construct the table, including cells, section headers and footers, index arrays, and so on. scrollRectToVisible I am trying to scroll to the bottom of a UITableView after it is done performing [self. chatTableView. insert(message, at: 0) self. import UIKit final class ContentSizedTableView: UITableView { override var contentSize:CGSize { didSet { invalidateIntrinsicContentSize() } } override var intrinsicContentSize: CGSize { layoutIfNeeded() return CGSize(width: UIView Jun 23, 1997 · There could be several reasons why your tableView cells are not showing. In a table view, scrolling is smoother (if you get your UITableView code right Jan 29, 2013 · I have a UITableView which is populated from array and a drop down list. height)-navigationBarHeight) Jun 11, 2016 · It's not the scrolling code in your question. The views you add to a scroll view stay in memory until you remove them. familyAModelArray. height - self. Sections work fine. declare the variable current Page with initial Value 0 and a bool to check if any list is being loaded with initial value false May 13, 2016 · I have plain UITableView with many sections and rows. How can I get the UITableView scroll position so I can save it? Setting scroll position in UITableView. resume() } } When my UITableViewController executed first of all will implement func tableView and he will return zero count cause getData() didn't run yet and of course second tableView who returning my Cell will not implement. 2 solution without KVO, DispatchQueue, or setting constraints yourself. After posting a post, or editing a specific post (UITableViewCell), UITableview is reloaded. It maintains content offset even after reloadData function is called. scrollToRow(at: IndexPath(row: lastRowIndex, section: 0), at Oct 8, 2014 · tableView = UITableView(frame: view. Mar 23, 2018 · I use the following code to update my tableView. main. If I am not at the top of the UITableView and I tableView. A UITableView instead reuses its subviews, needing fewer. Jan 28, 2023 · Infinite Scroll is working. This tutorial has been updated for Swift 2. It seems to me that there are scrolling mechanism for each view. 0 and 4. I believe this is due to the fact that because I reloaded data, as I'm scrolling up, the UITableView is recalculating the height for each cell coming into visibility. And you don't have to worry about scroll tableview manually, TPKeyboard will handle automatically. API Call. deselectItem(at Feb 25, 2024 · Note that the Bottom Space to Superview is in dashed line. Here's another option for Swift 4 that handles empty tableviews. You can solve this by storing your cell's height and use it to assign in estimatedHeightForRowAt for your cell. bounds, style: . I refresh the data and I want to insert the data in the table view above the current data, but I want to keep my current scroll position Sep 21, 2015 · First don't add UITableView in UIScrollView. They even provide a tool to test out your queries before building your app Jan 4, 2016 · override func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) { let lastElement = dataSource. frame. For efficiency, the table view redisplays only those rows that are visible. width), height: Int(view. indicator shows a wrong position/has the wrong size Jan 18, 2019 · I have also searched about this problem and until now I have not found a not hardcoded solution, but at least came to the following solution that works fine for my needs (it is almost the same as yours): May 3, 2011 · I have a list of data that I'm pulling from a web service. So, you can schedule your code after the next layout by using the main dispatch queue. My question is similar to this this question. dataSource Nov 19, 2023 · func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {// Switch statement to handle different cell types switch cellType {case . reloadData() tableView. So all you have to do is calculate the delta of contentSize height and add it to the current offset. reloadData() Function! look at following links. If you're sending the page number in the API request then this is the ideal way for implementing pagination in your app. numberOfRows(inSection: indexPath. – Jan 5, 2009 · [tableView reloadData]; I think I'm not suppose to call selectRowAtIndexPath:animated:scrollPosition method here. beginUpdates() self. Jun 9, 2014 · You must reload your TableView in main thread only. I still can't get these You set the scroll position through a parameter of the select Row(at: animated: scroll Position:), scroll To Nearest Selected Row(at: animated:), cell For Row(at:), and index Path For Selected Row methods. Plain) view. I use mopub's placer to insert ads into tableview and I notice whenever the app performs [tableview reloadData], the tableview scroll offset will go wrong and jump to a random position. dequeueReusableCell(withIdentifier: ImageCell. content: // Dequeue a reusable cell and cast it as ListArticleSmall guard let cell = tableView. you can read about UITableView Class Here Nov 29, 2018 · The problem is in some cells after expanding cell height tableView scrolls very higher or lower the selectedCell I mean it miss the current cell position. Use this method for api call, it will call api once reached at last cell. init(x: 0, y: navigationBarHeight, width: Int(view. Hi,you just have to call this line of code after loading table view. If you need to know when you hit the bottom of the UITableView, become it's delegate (because it is a subclass of UIScrollView), and use the -scrollViewDidScroll: delegate method to compare the table's content height and it's actual scroll position. rowHeight = UITableViewAutomaticDimension tableView. Sep 7, 2015 · let contentOffset = self. section < self. Jan 12, 2016 · How can one insert rows into a UITableView at the very top without causing the rest of the cells to be pushed down - so the scroll position does not appear to change at all? Just like Facebook and Twitter when new posts are delivered, they are inserted at the top but the scroll position remains fixed. And, btw, it's not reloadRowsAtIndexPaths (that's for updating existing rows in such a way that it won't scroll to the top like reloadData does), but rather insertRowsAtIndexPaths, like shown in my answer below. tableView numberOfRowsInSection:([self. //Bottom Refresh. zero, animated: false) tableView. reloadData(): tableView. extension UITableView { func hasRowAtIndexPath(indexPath: IndexPath) -> Bool { return indexPath. reloadData () Reloads the rows and sections of the table view. It's something else (perhaps a reloadData that's lingering about that you missed). height - tableView. It seems you have to implement pagination. Now I want to add WebView using WKWebView to access the news website when we tap the news item. layoutIfNeeded() and also use this UITableViewDelegate. endUpdates() Note: Here i want to append an object to an array which is the content of the UITableView and reload the TableView. contentSize. Often users can update this list by using Pull-to-Refresh technique or by pressing the update button. identifier) as? Jun 3, 2016 · I am facing problem in my app - you can post and edit your favorite places. Feb 25, 2011 · Swift 3. as soon as i click action button (against any particular cell), this cell's index should be passed to button's action method, there i have called an action sheet, in that action sheet there's another option "Report Progress", clicking that option should now get the index of cell SWIFT 3. visibleRows() or You Can Get IndexPath of Visible Rows By tableView. When an app takes too much memory, it gets terminated by the operating system. My problem is how do I detect the last section so it could load When you select a row, the method - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath in UITableViewDelegate gets called, so place a call to the scrollToRowAtIndexPath in that method. viewDidLoad() tableView. y let moreDataArray = getAllMessages() for message in moreDataArray. func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let add_on Apr 26, 2017 · As explained in this answer, the reload of the UITableView happens on the next layout run (usually, when you return control to the run loop). In that apps, I can scroll up infinitely because the scroll position is staying. tableView reloadData] NSIndexPath* indexPath = [NSIndexPath indexPathForRow: ([self. addSubview(tableView) When the user types and sends some text in the keyboard, the application ivoke the following method to scroll the tableView. This solution is based on Gulz's answer. 0. numberOfSections && indexPath. reloadData()}) }). I've encountered an issue calling trying some of the methods on an empty tableView. For every UI update it is recommended to use main thread. But sometimes after reload data of table, section change position. func scrollViewDidScroll(_ scrollView: UIScrollView) { //Load more cell if tableView. Plain) var Person_data = [Person]() override func viewDidLoad() { super. count - 1 if indexPath. Jun 3, 2017 · I have dynamic cell height in my tableView. when user interacts with the scrollView, retain the scroll position when new data is added to the top of the list, or if the list changes based on a selected filter. insert(message, at: 0 Jul 9, 2018 · First, you have to set a number of sections in your case should be one section contains the number of rows then you have to set the delegate & dataSource for your tableView since you are using xib or storyboard just sign do it from there or by programmatically Nov 26, 2010 · There's really no need to sum up all rows height, the new contentSize after reloading the table is already representing that. estimatedRowHeight = 100 I want to do same as whatsapp app (pagination), i want to load 25 by 25 row so when user scroll at top, i want to load new data but i want to keep same position of scroll, here is what i did Dec 29, 2017 · UItableView method scrollToRow(at:at:animated:) Scrolls through the table view until a row identified by index path is at a particular location on the screen. reversed() { dataArray. itemIdentifier(for: indexPath) else { collectionView. simpleTableView. class ViewController3: UIViewController, UITableViewDataSource, UITableViewDelegate { private let tableView = UITableView(frame: CGRect(x: 10, y: 50, width: 200, height:600), style: UITableViewStyle. So I am updating Model(calling API again and appending results) as bottom cell is reached and reloading whole UITable Dec 30, 2020 · I am having a major problem with the scroll position. Apr 1, 2018 · First update your modelArray and then call reloadData () method of TableView. setContentOffset(CGPoint(x: 0, y: tableView. setContentOffset(contentOffset, animated: false) also check this answer : reloadData() of UITableView with Dynamic cell heights causes jumpy scrolling Apr 22, 2017 · func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat { return 20 } And still scroll to the top with : myTableViewDatas = newDatas tableView. I need to remember the scroll position when the user scroll for each data source; I need to load the previous scroll position when the user return to the data source May 9, 2017 · Swift 5 and 4. y < 100 { let beforeTableViewContentHeight = tableView. link1. top, animated: true) Jan 31, 2015 · Basically, my UITableView has dynamic cell heights for every cell. I've had a look at the following 2 questions that are similar. Jul 28, 2021 · // Calculate the distance of the tableView // from the current content offset to the end of the content size let distanceFromOffset = self. Swift 3. reloadData() self. scroll(to: . I originally had [self. Nov 14, 2015 · Cause your UITableView's top point same with UINavigationBar's bottom point so this affect your UITableView's bottom items to scrolling. reloadData() to make sure the table data is in sync with my model. layoutIfNeeded() self. My problem is: the UITableview scrolls to the top after reloading. Download TPKeyboardAvoiding make TPKeyboardAvoidingTableView as super class of tableview. scrollTo a particular section everytime the view is loaded for the first time. contenOffset = xy" to scroll the TableView to show specific data when becoming visible. Thanks in advance! Actually it happens because it recalculates the UITableViewAutomaticDimension height. I want to set the scroll position of tableview to the row which was top row before reloading table. It adjusts offsets if the table shrinks as a result of the Oct 10, 2019 · When you call reloadData() on a UITableView it will refresh all cells from your data source, but it will also lose any selections the user has made. tableView numberOfSections]-1)]-1) inSection: ([self. tableView numberOfSections]-1)]; [self. messages. layoutIfNeeded() tableView. row is 3, we will update our tableviewData as well. If I select any row of drop down list the array will be inserted with new values and tableview should get reloaded. setContentOffset(CGPoint. frame = CGRect. contentOffset. If you are changing row height at the time of reloading data or changing datasource then you can use scrollToRowAtIndexPath:atScrollPosition:animated: method. Nov 3, 2014 · you can get Array of visible Cell by using TableView Function tableView. append(self. layoutIfNeeded() method after . Apr 8, 2015 · TableView does not reset scroll position. Apr 30, 2019 · When I scroll to the bottom and scroll back up, the songs that have been completed are now suddenly displayed as no longer question marks (which is what I want but I want this to happen immediately). EDIT (something like this): Oct 29, 2015 · You have to create a variable with link to tableView and create it before viewWillAppear. Next we will add the code that will reload each cell that we tap on, but, if the indexPath. (I mean I'm still seeing the same chat message) Nov 12, 2018 · What I want to do is to show vertical scroll bar (indicator) always, even after I call tableView. Once the VC becomes visible I need to call UITableView. section) } func scrollToTop(animated: Bool) { let indexPath Feb 13, 2016 · I want my UITableView reload more chat messages staying current scroll position when I scroll to top(If I load older 20 messages more, I still seeing a 21st message. For all the folks here trying to figure out how to solve this problem the key is to call the . height), animated: false) Jun 23, 2021 · UITableView reloadData异步刷新问题 简介： UITableView的reloadData是异步的，在调用该方法后，会继续执行其它代码（tableView的布局、cell的显示和高度计算等代理方法，或者自己的一些代码等），不会阻塞主线程；即reloadDate并不会等待tableview更新结束后才返回，而是立即返回。 Jun 10, 2019 · Table views keep the memory footprint of your app small. reloadData() ==> This is working, I scroll to Y = 0. 0, Xcode 7, and Alamofire 3. Sep 30, 2016 · but what if i have an array with indexes, and my table iterates over that array to print its contents (in cells). . I think I tried anything : scrollToRow. class YourClass: YourType, UIScrollViewDelegate {} Check the official apple documentation Apr 10, 2020 · My tableview has custom sections and cells. contentOffset self. I don't know where I've messed it up since before it worked very fine maintaining the offset position. reloadData() // reload tableView Mar 13, 2019 · Most of our apps present lists or grids of some data by using UITableView or UICollectionView. When I apply the filters and only a small number of rows May 10, 2020 · Add the following method below the cellForRowAt indexPath: With this method we can get the index path from the tapped cell. So no need to do anything, if you want to keep pixel position. It always scrolls to the top. Jun 16, 2021 · Reloading Reference Type Items. tableView reloadData]. But if not here, then where? Is there any delegate method that gets called after the following method?-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath; When I scroll down to a specific cell and drill down to detailedviewcontrollers and return again the master view table has returned all the way to the top. Mar 2, 2020 · A UIViewController contains a UITableView. Yahoo has a nice stock price API. Everybody knows how to update UITableView by calling the reloadData method on the tableView instance. reloadData(), scrolling up becomes jumpy. func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { // Get selected hero using index path guard let selectedHero = dataSource. row == lastElement { // handle your logic here to get more items, add it to dataSource and reload tableview } } Jul 25, 2018 · I have a UITableView that gets reloaded if a button in some of its cells gets tapped. row] { return 344 } else { return 140 } } func tableView(_ tableView Sep 24, 2021 · Swift 5. Every time the user scroll to the bottom it will call the server and load additional datas. Otherwise your app will be crashed or will be updated after some time. I tried looking into NSScrollView, NSClipView and NSTableView. This will allow us to see that specific row change. tableView scrollToRowAtIndexPath:indexPath May 4, 2019 · The problem with the math and internal data occurs when the table view is scrolled on and is repeatedly calling the reloadData function as the visible cells are changed which I don't want it to do for any form of scrolling whatsoever. At the same time I would like to use `UITableView. If you want to reload your table view while also saving and restoring any selections, you should take a copy of the indexPathsForSelectedRows property before the reload, then re-apply those selections after calling reloadData(). The goal is to view the new text in the screen (like a chat) Jul 11, 2017 · tableView. As I explained in iOS/Swift: ScrollViews(TableViews and CollectionViews) in TableViewCells with Dynamic Height, we have to set the Priority to a value that is less than other ones (for example, to 999) in order to avoid Unable to simultaneously satisfy constraints warning on UIView-Encapsulated-Layout-Height when we try to adjust the May 2, 2023 · support two way infinite-scroll/ paginate. If you just want the code, here it is: PullToUpdateDemo on GitHub or [zip][3]. func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {. The issue appears if the following steps are made: Tap a button on a cell so that another cells appear below the When user taps load more button, older messages (plus all the current messages which are present on screen) get fetched from DB (using NSFetchedResultsController) and then I am calling reloadData() method on chat table view. For example it was happened when i change tabs. tableView. But what about animation? ReloadData method is invalidating the current items provided by data Jan 13, 2020 · I'm having issues with my tableView after I reloadData(). Summary: I need a way to automatically reload all the cells on a uitableview immediately following the occurence of a particular event. Here are some common issues and potential solutions to consider: Data Source and Delegate Implementation: Ensure that you have properly implemented the UITableViewDataSource and UITableViewDelegate protocols for your table view. ) KakaoTalk and Line Apps is doing this. Use. What cou Nov 20, 2017 · Whenever I scroll (or reloadData), the tableview will suddenly jump to a random content offset position. Prior to iOS 15, we can reload a cell with reference type item using the snapshot’s reloadItems(_:) method like so:. reloadData(). May 3, 2016 · You must use UIScrollViewDelegate in your tableView to intercept scrollView actions with:. self. Create a new Cocoa Touch Class named DetailViewController, and make it Dec 3, 2019 · I am trying to implement Infinite Scrolling using paginated API in UITableView. func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat { if cellsMode[indexPath. height let beforeTableViewOffset = tableView. y // Insert new model into the list model at zero index self. childAModelArray) tableView. ohaj gdrmot jpuhw pqtj gtyfo ghvq ubadqn nqgl runj ery
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