Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. UITableView Swift not scrolling. Guys I have this table view with three different cells and the table view renders on the simulator just fine but when i scroll it immediately jumps back to the top.
To scroll in a simulator, you press and move your cursor up and down. If you are still not able to scroll, it must be a bug. Test to do: Add ten cells for TableView. And it must be worked. Why do you return 4 in numberOfRowsInSection when you are obviously only showing 3 cells? Have you tried setting that to 3? I had the same problem. After putting "tableView.
Learn more. Asked 5 years, 4 months ago. Active 8 days ago. Viewed 8k times. Sruthin Gaddam Sruthin Gaddam 2 2 silver badges 13 13 bronze badges. Swift has nothing to do with this question other than it's the programming language you wrote it in. What happens when you change tableView. Are your cells correctly using autolayout? So the problem is that you haven't applied any constraints to the tableview, so it's actually still taller than your device and doesn't need to "scroll".
Notice also that there are big red exclamation points in your storyboard scenes? Yeah you need to fix those. Active Oldest Votes. I landed on your question, because I had the same one. Ujjwal-Nadhani Ujjwal-Nadhani 2 2 gold badges 6 6 silver badges 19 19 bronze badges. WOW ujjiwal-nadhan thank you! New to Swift and the simulator and did not know this. Very helpful!
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This is what I tried, but I get an error saying that an Integer is not convertible to an index Path. What should I do? Here's the Swift 2.
Learn more. How do i automatically scroll in a table view? Swift Ask Question. Asked 5 years ago. Active 4 months ago.
UICollectionView using horizontal and vertical scrolling with sticky rows and columns
Viewed 27k times. How do I make the scroll view scroll automatically? Middle, animated: true or self. Middle, animated: true. Active Oldest Votes. Middle, animated: true The above example assume you have only one section. I hope this help you. MoD 61 9 9 bronze badges. Victor Sigler Victor Sigler For Swift 5 Xcode Irshad Qureshi Irshad Qureshi 16 16 silver badges 36 36 bronze badges.Vintage rototiller
I have a table view which received data from a real-time database. These data are added from the bottom of the table view and so on this table view has to scroll down itself to show new data. I've found a method to do it however I'm not satisfied because the scroll always start from the top of the list. Not very beautiful.
The issue is probably how the rows were inserted into the table. For example, if you add rows to the end using something like this, you get a very smooth UI:. And I turned off the animation because I know they're off screen, and I'll then scroll to that row. Learn more. Scroll down tableView in swift? Ask Question. Asked 3 years, 10 months ago. Active 3 years, 10 months ago. Viewed 3k times. Rob k 60 60 gold badges silver badges bronze badges. Bram'in Bram'in 1 1 gold badge 5 5 silver badges 15 15 bronze badges.
Is the problem really here in the scrolling logic? Or are you doing a reloadData before you call this? Calling reloadData will always scroll to the top. If you can, do reloadRowsAtIndexPaths for the added rows will keep it from scrolling up to the top.
UITableView – Tutorial For Beginners
Indeed you're right I do a reloadData. I'm trying to reloadRowsAtIndexPaths but for the moment it doesn't work. Actually I noticed that even if I remove reloadData, when I insert a row the table view scroll up to the top. Is there any reason to this? It's not the scrolling code in your question.Hello world! Download the source code for this post here. Open up the main storyboard, and, in the object library bottom right panedrag out a Table View Controller and change the entry point arrow to that new screen.Toyota android auto
Also set the Class attribute to ViewController! Your storyboard should look like the screenshot below. The benefit of doing is to prevent laggy scrolling. This approach is ideal! This gives the user the appearance of super smooth scrolling! That should fix our warning!MBLTdev 15: Оптимизация работы с UITableView для достижения плавной прокрутки в сложных условиях
We need to create the data that will actually show up in UITableView. Feel free to modify it in any way you want! We can implement it by simply returning 1. It should have two parameters, not one!
Using the one-parameter overload and forcibly unwrapping it, in some cases, will return nil and crash our app!
Now that we have a cell, we can repopulate it. Like I mentioned before, delegates are more for UI events. We can use that path to get the exact item that was selected. This make it a great tool for debugging! In this post, we learned how to use UITableView to create a dynamic list healthy foods.
If the row is already fully visible, no scrolling occurs. For example, if the row is above the visible area, the behavior is identical to that specified by UITable View. Scroll Position. This is the default. Scrolls through the table view until a row identified by index path is at a particular location on the screen. Scrolls the table view so that the selected row nearest to a specified position in the table view is at that position.
Language: Swift Objective-C. Enumeration UITable View.
The position in the table view top, middle, bottom to which a given row is scrolled. SDKs iOS 2. Framework UIKit. Declaration enum ScrollPosition : Int. Topics Constants. See Also Scrolling the Table View. Scroll Position, animated : Bool Scrolls through the table view until a row identified by index path is at a particular location on the screen.Hbmenu turn off applet mode
Scroll Position, animated : Bool Scrolls the table view so that the selected row nearest to a specified position in the table view is at that position.Posted by: admin February 24, Leave a comment. Similar issues could be found all over the StrackOverflow but none of the proposed solutions helped me to completely get rid of the lag. I have followed multiple optimization tips and managed to optimize scrolling a lot. Unfortunately it is still not perfect.
This is my scenario:. Originally before starting new background thread to fetch the image here step 1 was UIImage cache check without background thread. In this case if we have the image in the cache we assign it instantly and this introduces a great lag during fast scrolling we assign images to often as long as we fetch them instantly.
Those lines are commented at my example attached below. Any suggest how to deal with those two issues or how to optimize my scenario are appreciated. This way you can check, if the problem occurs of your Image rendering. You are somehow already doing this, but you are doing this couple of times everytime you are scrolling or if your cache is full.
In our last project we had a UICollectionView with book covers. Most of the covers were between kb big and the feeling while scrolling was really bad. So we created a thumbnail for each image thumbails about kb and used the thumbnails instead of real covers. Works like a charm!
I attached the thumbnail creation function. Really easy to use. Look for the examples in Lecture 14 titled FlickrFetcher and Photomania. Make a CoreData Entity with an appropriate title and define whatever attributes data variables you want. This Category loads the photo and the thumbnail into CoreData Entity.R print to console from function
The first time will be slow. However, after that the user should be able to scroll through TableView smoothly and then all the updated results will load automatically.
UITableView scrolling is not smooth
Let me know. Those two tricks got my table flowing really nice. Maybe you could try SDWebImage instead. It is also a xamarin component which fashions an asynchronous image downloader and asynchronous memory and disk image caching with automatic cache expiration handling. Using it would probably mean throwing away a lot of hard written code, but it might be worth it -plus your code will become a lot simpler.
Weel I had a similar problem, my scroll was not smooth. Tags: scrolluitableviewview. February 24, Ios Leave a comment. This leaves It would take 2 or more tries to make my taps register. So I decided to run my app in Simulato Add menu. One nice thing is that CoreData handles all the memory management.
Good luck! Hope that helps. GetTokens: what is the purpose of the oldCookieToken parameter?Tag: iosuitableview. I have an array of NSStrings stored as self. I am new to iOS and I know that reuseIdentifier most likely has a simple advantage that is eluding me but why go through all of that trouble and long syntax when the following works as well? It's the speed of your scrolls: reusing cells helps you to a smooth scroll of table cells.
It is harder to notice for do-nothing cells, the heavier the cell becomes, the less smooth very quickly. Pre-allocating and reusing cells let you get a scroll that is visually pleasing.
In addition, throw-away CPU cycles drain your battery. A user can scroll through a table at a reasonably fast rate, so the cycles that you burn there can add up quickly. Adding a reuse identifier eliminates calls to [[UITableViewCell alloc] init] beyond the few cells which are visible on the screen.
When a cell goes off the screen, UITableView adds that cell to the pool of cells available for reuse, eliminating memory allocation and deallocation for the instance of the cell itself. When your tableView:cellForRowAtIndexPath: asks for the new cell, UITableView hands you back an instance that has been scrolled of the screen, so all you need to do is to re-configure the instance to look like the cell that you need to display.
In many cases, reconfiguring an existing cell is significantly faster than allocating a new cell.
Here is a link to a question with information on other things that you could do to improve the performance of your scrolls. The "top area with clock" is called a status bar. That bar is transparent and is displayed as the topmost view in a window. This means that nothing can cover the status bar. You can show, hide and change the appearance of the status bar changing the content from Light You just need to add this to your code in viewDidLoad. Try transferring everything from plists to the storyboard.
I did this with a friend of mine and it only took about 20 minutes for the code to build and run successfully on his own laptop.
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