Question

I have a TableViewController with 5 cells added dymanically at run time.
The initial values of the cells(cell.detailtext.text) is some default value same for all cells. Now once the viewDidLoad is finished and even this is done : (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath, Now I need to update the cell values at runtime based on certail conditions. How do I update the cell values later?

In short I need to implement the below algo in a function in IOS

for each cell of tableView

cell.detailtext.text = @”new Value”

OR

func()
{

cell = cell at index(passed to function)

cell.detailtext.text = @”new Value”(passed to function)

}

Answer 1

When ever you update the dataSource for the UITableView u need to call reloadData

But that updates the entire table and has two issues:

1) If you have a large table and your just changing a single value its a large overhead

2) If you are animating your updates (additions or removals) this can lag your device with large amounts of data

check the Class Reference:
http://developer.apple.com/library/ios/#documentation/uikit/reference/UITableView_Class/Reference/Reference.html

Alternatively if you are just updating individual cells try calling

reloadRowsAtIndexPaths:withRowAnimation:

It is much better performance wise, but has some limitations such as if you are adding large amounts of data it cant be applied.

I could go into more situations and detail but that would be going out of scope.