How to add cell to tableview's reuse queue before 'cellForRow:'?

Question

Creating a cell costs a lot of time and make the first scroll lagging, so I want to create a cell and add it to tableview's reuse queue before cellForRow: called.

I use dequeueReusableCellWithIdentifier: in viewDidLoad, but when I scroll the table, the cell is being created again.

http://stackoverflow.com/questions/3552343/uitableview-dequeuereusablecellwithidentifier-theory see this link — Dipen Chudasama, Mar 17 '15 at 06:41
Why are you add this in viewDidLoad ? why not in cellForRow: ? — Dipen Chudasama, Mar 17 '15 at 06:52
If in the cellForRow, there's no cell can be reused when first scroll, tableview will create a cell and this will make scroll lagging — Sagi, Mar 17 '15 at 07:03

score 0 · Accepted Answer · answered Mar 17 '15 at 07:29

In general all drawing methods of scrollview should be kept as simple as possible to avoid lag. This means you should prepare your data/model in viewDidLoad/viewWillAppear or even in previous ViewController. Your cellForRow should be as simple as set this image(s) and those text(s) - no checks, no expensive operations such as bluring, retrieving data from CoreData/Network, etc.

If you are not sure which thing exactly causes your lag, you should learn how to use TimeProfiler. If you feel lost in documentation, have a look this(quite outdated though) tutorial.

With thus said I cannot be able to help you anymore until you post some code which we could discuss.

How to add cell to tableview's reuse queue before 'cellForRow:'?

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