Slow scrolling in UITableView containing UI Elements in each cell?

You should be re-using UITableViewCells which contain three generic UISegmentedControls. When tableView:cellForRowAtIndexPath: is called, you should set the correct values for each segmented control - always Those values have to be stored "somewhere else", outside cells, most likely in same place as where you get the other data for cells Update with draft code, should not compile as-is: (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *cellId = @"CellId"; static NSString *cellNib = @"Cell"; UITableViewCell *cell = (UITableViewCell *)tableView dequeueReusableCellWithIdentifier:cellId; if (cell == nil) { NSArray *nib = NSBundle mainBundle loadNibNamed:cellNib owner:self options:nil; for (id nibItem in nib) { if (nibItem isKindOfClass:UITableViewCell class) { cell = (UITableViewCell *)nibItem; break; } } } // Configure the cell, all values! UISegmentedControl *seg = nil; seg = (UISegmentedControl *)cell viewWithTag:1; seg.

SelectedSegmentIndex = 0 UISegmentedControl *seg = nil; seg = (UISegmentedControl *)cell viewWithTag:2; seg. SelectedSegmentIndex = 0 return cell; } The idea is that you create a custom UITableViewCell template in Interface Builder with 3 segmented Controls. Give each control a UNIQUE tag id number.

Use the tag id to get access to each specific control and setup ALL VALUES - because you are reusing the same cells and by default they will contain old values Btw about cell non-selection... Well, there are many ways to do that, wrote even a blog about it How to Disable UITableCell Selection Yep, it's old and got title wrong, but should work Hope this helps :).

You should be re-using UITableViewCells, which contain three generic UISegmentedControls. When tableView:cellForRowAtIndexPath: is called, you should set the correct values for each segmented control - always. Those values have to be stored "somewhere else", outside cells, most likely in same place as where you get the other data for cells.

Update with draft code, should not compile as-is: - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *cellId = @"CellId"; static NSString *cellNib = @"Cell"; UITableViewCell *cell = (UITableViewCell *)tableView dequeueReusableCellWithIdentifier:cellId; if (cell == nil) { NSArray *nib = NSBundle mainBundle loadNibNamed:cellNib owner:self options:nil; for (id nibItem in nib) { if (nibItem isKindOfClass:UITableViewCell class) { cell = (UITableViewCell *)nibItem; break; } } } // Configure the cell, all values! UISegmentedControl *seg = nil; seg = (UISegmentedControl *)cell viewWithTag:1; seg. SelectedSegmentIndex = 0 UISegmentedControl *seg = nil; seg = (UISegmentedControl *)cell viewWithTag:2; seg.

SelectedSegmentIndex = 0 return cell; } The idea is that you create a custom UITableViewCell template in Interface Builder with 3 segmented Controls. Give each control a UNIQUE tag id number. Use the tag id to get access to each specific control and setup ALL VALUES - because you are reusing the same cells and by default they will contain old values.

Btw about cell non-selection... Well, there are many ways to do that, wrote even a blog about it "How to Disable UITableCell Selection". Yep, it's old and got title wrong, but should work. Hope this helps :).

I can't totally relate your comment to my requirements. I have posted the code... would you be able to suggest something now? – Ravi Oct 26 at 18:27.

I've never seen a UITableView keep "live" more than one or two cells beyond those visible on the screen. Are you using dequeueReusableCellWithIdentifier to recycle your cells?

DequeueReusableCellWithIdentifier is being used... – Ravi Oct 26 at 18:25.

I suspect that your problem is something other than segmented controls. A UITableView has built-in methods to take care of loading and reloading classes as they go off-screen, so all 210 controls should not be in memory at once. I would start by checking to make sure that you are using dequeueReusableCellWithIdentifier: correctly (especially if each UITableViewCell is the same class).

Maybe also check for memory leaks.

I am using dequeueReusableCellWithIdentifier. I have a dynamically generated NSMutableArray of Segmented Controls that I'd like to see behave properly. – Ravi Oct 26 at 18:25 Ah, ok.

Don't keep an array of segmented controls. Add the segmentedControl as a subview of the cell inside of the "if" statement and keep track of the segment values in your viewController. Then just set the segmentedControl to the correct value in the block underneath of the if statement (ie.Cell.

SegmentedControl1. SelectedSegmentIndex = ). In this case, the segmentedControl would be the property of the cell.(You can subclass UITableViewCell).

– Matthew Gillingham Oct 27 at 1:14.

You can allocate the segmented controls in your cell for row at index path when the cells are being created. Allocate them in cell for row at index path. Allocate and add the segmented controls under the (cell == nil) condition.

Or You can reuse 3 segmented controls for all the cells. And hold an array for keeping the changed values.

Create a custom UITableViewCell subclass. Have three properties in it for your three UISegmentedControls and add them in the init method: @interfate MyCell : UITableViewCell @property (nonatomic, retain, readonly) UISegmentedControl *control1; @property (nonatomic, retain, readonly) UISegmentedControl *control2; @property (nonatomic, retain, readonly) UISegmentedControl *control3; @end @implementation @synthesize control1 = _control1; @synthesize control2 = _control2; @synthesize control3 = _control2; - (id)init { if ((self = super init)) { _control1 = UISegmentedControl alloc init...; _control1. Frame = CGRectMake(...); self addSubView:_control1; // repeat with control2 & control3 } //... @end Then, rather than storing arrays of UISegmentedControls you can then have arrays of NSNumber holding the selected index.

You'd then do something like: cell. Control1. SelectedIndex = array1 objectAtIndex:indexPath.

Row integerValue; You could also create custom objects to hold this data and store them in one array.

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