IOS 7 - How to get the indexPath from button placed in UITableViewCell - iphone

Question

I've programmatically created a UITableView and added UISwitch to it's cell accessory view.
This is my code for UISwitch in cell accessory view in cellForRowAtIndexPath method.
UISwitch *accessorySwitch = [[UISwitch alloc]initWithFrame:CGRectZero];
[accessorySwitch setOn:NO animated:YES];
[accessorySwitch addTarget:self action:#selector(changeSwitch:) forControlEvents:UIControlEventValueChanged];
cell.accessoryView = accessorySwitch;
This is the method which is called after the button is clicked.
- (void)changeSwitch:(UISwitch *)sender{
UITableViewCell *cell = (UITableViewCell *)[sender superview];
NSIndexPath *indexPath = [self.filterTableView indexPathForCell:cell];
NSLog(#"%ld",(long)indexPath);
……………. My other code…….
}
I am able to print the index path value in iOS 6
But in iOS 7 it prints nil,
Am i missing anything in iOS 7 or there is some other approach to get the indexPath in iOS 7
Thanks,
Arun.

Answer 1

NSLog(#"%ld",(long)indexPath); is wrong this will print the pointer address of indexPath
try using following codes
CGPoint center= sender.center;
CGPoint rootViewPoint = [sender.superview convertPoint:center toView:self.filterTableView];
NSIndexPath *indexPath = [self.filterTableView indexPathForRowAtPoint:rootViewPoint];
NSLog(#"%#",indexPath);

Answer 2

Swift solution:
A UITableView extension like this one can be useful for this.
extension UITableView {
func indexPathForView(view: AnyObject) -> NSIndexPath? {
let originInTableView = self.convertPoint(CGPointZero, fromView: (view as! UIView))
return self.indexPathForRowAtPoint(originInTableView)
}
}
Usage becomes easy everywhere.
let indexPath = tableView.indexPathForView(button)

Answer 3

If you have button in cell. You can get cell by calling superview. And then can get Indexpath by this way.
(void)obButtonTap:(UIButton *)sender {
UITableViewCell *cell = (UITableViewCell *)sender.superview;
NSIndexPath *indexPath = [tableView indexPathForCell:cell];
}

Answer 4

You can assign tags to each switch in cellForRowAtIndexPath method like
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UISwitch *accessorySwitch = [[UISwitch alloc]initWithFrame:CGRectZero];
[accessorySwitch setOn:NO animated:YES];
[accessorySwitch addTarget:self action:#selector(changeSwitch:) forControlEvents:UIControlEventValueChanged];
cell.accessoryView = accessorySwitch;
accessorySwitch.tag = indexPath.row;
}
- (void)changeSwitch:(UISwitch *)sender{
NSIndexPath *indexPath = [NSIndexPath indexPathWithIndex:[sender tag]];
NSLog(#"%ld",(long)indexPath);
}

Answer 5

SWIFT 4 :
extension UITableView {
func indexPathForView(view: AnyObject) -> NSIndexPath? {
let originInTableView = self.convert(CGPoint.zero, from: (view as! UIView))
return self.indexPathForRow(at: originInTableView)! as NSIndexPath
}
}

Answer 6

SWIFT 4 Conversion, creates global extension:
extension UITableView {
func indexPathForView(view: UIView) -> IndexPath? {
let originInTableView = self.convert(CGPoint.zero, from: (view))
return self.indexPathForRow(at: originInTableView)
}
}
Usage example:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = ...
cell.myButton.addTarget(self, action: #selector(myButtonAction(_:)), for: .primaryActionTriggered)
return cell
}
#objc func myButtonAction(_ button:UIButton) {
guard let ip = self.tableView.indexPathForView(view: button) else {
return
}
}

Answer 7

You are probably getting burned, making the assumption that the switch's superview is going to be the tableViewCell. Maybe in iOS 7 they changed the hierarchy to achieve some sort of visual effect; maybe there is a new view inserted in there.
You could possibly subclass UISwitch and give it an indexPath property. Then in your cellForRowAtIndexPath, assign it there so you have a reference.

Answer 8

Tested on Swift5.x
if you want to get row number when you click on the button placed in tableViewCell, Then the below function will work.
#IBAction func buttonClickeAction(_ sender: UIButton) {
let btnPoint = sender.convert(CGPoint.zero, to: self.tableView)
let indexPath = self.tableView.indexPathForRow(at: btnPoint)
print(indexPath?.row)
}

Answer 9

I think that is dangerous to rely on the position of the button to know which one have been clicked.
I prefere create a dictionary taking as a key the button/switch itself, and as a value the indexpath :
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
...
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
NSValue * accessorySwitchKey = [NSValue valueWithNonretainedObject:[cell settingSwitch]];
[[self switchIndexDictionary]setObject:indexPath accessorySwitchKey];
...
}
then when the switch/button is triggered I get the indexpath easily from my dictionary :
- (void)toggleSetting:(id)sender
{
UISwitch *selectedSwitch = (UISwitch *) sender;
NSValue * accessorySwitchKey = [NSValue valueWithNonretainedObject:selectedSwitch];
NSIndexPath *indexPath = [[self switchIndexDictionary]objectForKey: accessorySwitchKey];
}