CodeTry CodeTry - 1 year ago 83
Objective-C Question

TableView not responding to TableViewcell custom protocol

I have a TableviewController : TableViewController.m , this has dynamic cells .

I have subclassed one cell(just one ) to : RegisterTableViewCell.m/.h , have a UIButton in this cell in storyboard and have created an outlet for the same in TableViewcell.m .

I have decalared a custom protocol in TableViewcell to get the click event on button in TableViewController.m . I want to do a segue on click of this button .


@protocol CellDelegate <NSObject>
-(void)didClickOnCellAtIndex:(NSInteger)cellIndex withData:(id)data;
@property (weak,nonatomic) id<CellDelegate>delegate;
@property (assign,nonatomic) NSInteger cellIndex;
@property (weak, nonatomic) IBOutlet UIButton *PopoverAnchorButton;


@synthesize PopoverAnchorButton = _PopoverAnchorButton;

- (void)awakeFromNib {
// Initialization code
[self.PopoverAnchorButton addTarget:self action:@selector(didTapButton:) forControlEvents:UIControlEventTouchUpInside];
- (void)didTapButton:(id)sender{
NSLog(@"Anchor Button Pressed");
NSLog(@"self.delegate %d ", [self.delegate isEqual:nil]);
NSLog(@"responds to selector %d ", [self.delegate respondsToSelector:@selector(didClickOnCellAtIndex:withData:)]);
if(self.delegate && [self.delegate respondsToSelector:@selector(didClickOnCellAtIndex:withData:)]){
[self.delegate didClickOnCellAtIndex:_cellIndex withData:@"abc"];



@interface SideBarTableViewController : UITableViewController <UIPopoverPresentationControllerDelegate ,CellDelegate>


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *cellIdentifier = [menuItems objectAtIndex:indexPath.row];

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath:indexPath];
RegisterTableViewCell *cellreg = [[RegisterTableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"register"];
cellreg.delegate = self;
cellreg.cellIndex = indexPath.row;
return cell;

-(void)didClickOnCellAtIndex:(NSInteger)cellIndex withData:(id)data
NSLog(@"cell at index %ld clicked",(long)cellIndex);


My didClickOnCellAtIndex func in not called in TableViewController.m .
Even didTapButton func in RegisterTableViewCell.m , the 'if' condition is not executed, - "responds to selector = 0".

Also , i have just subclassed one of cells, whose instance i am getting in cellForRowAtIndexPath, but cellForRowAtIndexPath is called only once the table view is shown .

Won't the ref RegisterTableViewCell *cellreg and its property cellreg.delegate cleared by the time button on this cell is selected ?

My whole objective is to put a uibutton in some selected cells(for now say just 1) to the right end and when user clicks the cell or this button(preferably cell ), i want to do a popover presentation segue to a vc with popover arrow pointing towards the button .

For this question, my obj is to get the click event on the button in RegisterTableViewCell in TableViewController so that i can call prepareforsegue with the sender from here.

I am stuck at this . Please help.

Answer Source

The problem is:1. you are put the UITableViewCell *cell in your table and return it. So the tableview will show this UITableViewCell cell.

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath:indexPath];
return cell;

2.You alloc init RegisterTableViewCell, assign Delegate.. but don't use it,(do't return cellreg) so it never show up in UI and u can not interaction with this cell to trigger button and delegate.

RegisterTableViewCell *cellreg = [[RegisterTableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"register"];
cellreg.delegate = self;
cellreg.cellIndex = indexPath.row;

Fixed this by init and return RegisterTableViewCell

 RegisterTableViewCell *cell = [tableView dequeueReuseWithIdentifier:@"regisID"];
    if(cell == nill) {
    [tableView registerNibForCellReuserWithIdentifier:@"regisID"];//with storyboard or nib
    cell = [tableView dequeueReuseWithIdentifier:@"regisID"];
    cell.delegate = cell;
    //cell setData
    return cell;
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