why tableview cells are starts flickering when they are going to be reused?

Question

I'm building a chat interface. I'm using multiple types of tableView cells in UITableView. Table view cells are start flickering when new cell is added into tableView from reusablecell. I'm dequeuing tableview cells with following piece of code. How get scrolling smooth with out any flickering.

tableView.dequeueReusableCellWithIdentifier("MessageLessonTableViewCell") as! MessageLessonTableViewCell

@PranavGupte i'm adding new tableview cells in two methods. self.tableView.insertRowsAtIndexPaths([indexPath], withRowAnimation: animation) self.tableView.scrollToRowAtIndexPath(indexPath, atScrollPosition: UITableViewScrollPosition.Bottom, animated: true) — chandra mohan, Jul 20 '16 at 05:32
and adding element datasource and using tableview.reloaddata() — chandra mohan, Jul 20 '16 at 05:33
because use of tableView.reloaddata() several times cause flikering effect see this : http://stackoverflow.com/questions/15196927/reload-uitableview-with-new-data-caused-flickering — Pranav, Jul 20 '16 at 05:35

score 1 · Answer 1 · answered Jul 20 '16 at 05:36

1

The main reason for flickering is that, tableView is getting data to be attached late in time. So when you scroll, it takes time to switch from one type of tableViewCell to another. Plus you might be doing DB operations in cellForRowAtIndexPath which delays in returning tbaleViewCell. For implementing Smooth scrolling refer this

answered Jul 20 '16 at 05:36

Vishal Sonawane

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I tried to do cell cofiguration in willdisplay cell. still it didn't work. – chandra mohan Jul 20 '16 at 06:18
If you are doing in DB operations either in willDisplay or cellForRowATIndexPath, try to get that all data in a array and while use it in displaying on cell content. Don't perform DB operations for per cell. – Vishal Sonawane Jul 20 '16 at 06:20
Problem is happening only when i tried to add new cell. at that time only scrolling is flickering. suppose user want to add message then it is flickering. – chandra mohan Jul 20 '16 at 06:24
Use beginUpdate and endUpdate when you insert new cell. – Vishal Sonawane Jul 20 '16 at 06:26
Using that still it didn't help. I think problem is happening because all cells are dynamic height and reusing cells – chandra mohan Jul 20 '16 at 06:28
If you are using dynamicHeight then your constraints must be proper. When you use dynamic height it takes some time to calculate height of cell at run time. You can use some basic animation as a workaround. – Vishal Sonawane Jul 20 '16 at 06:30
Thanks @vishal Sonawane i'll try that. – chandra mohan Jul 20 '16 at 06:32
Instead of calculating manually can i use this UITableViewAutomaticDimension? – chandra mohan Jul 20 '16 at 06:34
That's what I told you. Using dynamicHeight is nothing but UITableViewAutomaticDimension. Only thing which you will need to take care of is that make sure your constraints are proper. – Vishal Sonawane Jul 20 '16 at 06:38
@chandramohan You can mark my answer as correct if it has helped you. – Vishal Sonawane Jul 20 '16 at 06:38
@chandramohan Did you finally solved your problem? because I have the same error :( – Hugo Reyes Nov 28 '17 at 19:13

why tableview cells are starts flickering when they are going to be reused?

1 Answers1