Should I clear table view before using reloadData?

I want to put new values in a table view.

My tableView:开发者_运维问答cellForRowAtIndexPath: has the following

if (cell == nil) { // do something }

When I remove the if statement on top and use reloadData the app crashes. Do I need to clear the old values in the table before I use reloadData? If so how?

Thanks

Edit:

I'm sorry i didnt mean that i put reloadData inside tableView:cellForRowAtIndexPath:. i put it inside another method and removed if (cell == nil) { // do something } from inside tableView:cellForRowAtIndexPath:

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You should read the TableView Programming Guide to familiarize yourself with the concepts. reloadData is a method that eventually calls tableView:cellForRowAtIndexPath:.

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You are generating infinite loop by calling reloadData inside

tableView:cellForRowAtIndexPath:

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There is no need to clear data in a table view. You may want to ensure you properly implement -prepareForReuse in your UITableViewCell subclasses though, so that reused cells don't show old data.

It's BTW unclear why you want to remove the if (cell == nil) bit. If there is no cell to reuse (dequeue) then you need to create a new one. If you don't you'll return nil, which will cause an exception in UITableView.

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You (99% of the time) can't call reloadData from tableView:cellForRowAtIndexPath:. This is because reloadData eventually calls tableView:cellForRowAtIndexPath, so you get a never ending loop.

You need to explain more what you trying to do (and some extra code would be nice) in order to answer the question further.

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reloadData calls all tableView data source , so you cann't call it in cellForRowAtIndexPath it will make an infinite loop.