How to update a UITableVIewCell without reloading full table

Question

Possible Duplicate:
Is it possible to refresh a single UITableViewCell in a UITableView?

In a sequence I am updating only a particular object in my list data(NSMUtableArray), once updated its value, To make the GUI update, I was reloaded the full table like below...

[table reloadData];

It worked fine, However in efficiency point, it is hanging little bit while I am scrolling, Is there any way to update only a particular cell without reload full table?

thanks.

Solution 1

 - (void)reloadRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation;

Use this

Solution 2

You can use this..

NSArray *indexPathArray = [NSArray arrayWithObject:[NSIndexPath indexPathForRow:1 inSection:0]];
//You can add one or more indexPath in this array...

[tblview reloadRowsAtIndexPaths:indexPathArray withRowAnimation:UITableViewRowAnimationFade];

Solution 3

You can get the cell object by -

UITableViewCell *cell = [table cellForRowAtIndexPath:indexPath];

now change its related values as per your object from data array. It should reflect in the table. Hope this helps.

Solution 4

You can reload particular image row using index path .

    [mainTableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
                         withRowAnimation:UITableViewRowAnimationNone];

Solution 5

As you are making a GUI update, it's better to use reloadData rather then using any other methods. reloadData is the best way in your case to update the UITableView as it avoids inconsistency. The other thing which you can do is, you can add a condition in your cellForRowAtIndexPath and let execution happen only for the cell which is modified.

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Comments

[Rushi]

You can check this if it helps solve your problem stackoverflow.com/questions/7040740/…

[Newbee]

I already added that object need to updates its value

[amar]

See my answer then @newbee

[Fogmeister]

This is wrong. There are several ways to updates parts of a UITableView. reloadRowsAtIndexPaths, reloadSections and reloadSectionsWithIndexTitles will all reload parts of a UITableView.

[Rushi]

@Fogmeister my sentence is incorrect. I meant to say the condition in which Newbee is trying to use it. I've edited my answer.

[Newbee]

it worked, but still the freezing is there while scrolling for this update also..

[amar]

Does your cell has images?

[amar]

Use lazy Loading for them

[Supertecnoboff]

@amar Does "lazy loading" basically mean asynchronous loading?

[amar]

@Supertecnoboff yeah its a tech slang which means the loading is lazy and comes after the cell has been loaded.

[Mehul Chuahan]

Proper answer is here stackoverflow.com/questions/4448321/…

[amar]

@MehulChuahan thats actually wrong implementation we do not need begin and end updates for using reloadRows.It is needed only for insertrow and remove row

[Felipe]

Thanks, mate. This worked wonderfully for me.