How to get the collection cell in other function in ios? - ios

Question

I have UICollectionView on which contains so many custom cells.I have a long press gesture on it when user long press then cells start shaking & delete button is added on them.When i press the delete button then cell is removed from collection view.
Code for long press.
-(void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer
{
p = [gestureRecognizer locationInView:self.collection_view];
NSIndexPath *indexPath = [self.collection_view indexPathForItemAtPoint:p];
if (gestureRecognizer.state != UIGestureRecognizerStateEnded)
{
return;
}
if (indexPath == nil)
{
NSLog(#"couldn't find index path");
}
else
{
[[NSUserDefaults standardUserDefaults]setValue:#"yes" forKey:#"longPressed"];
[self.collection_view reloadData];
}
if (gestureRecognizer.state == UIGestureRecognizerStateEnded) {
NSLog(#"UIGestureRecognizerStateEnded");
//Do Whatever You want on End of Gesture
}
else if (gestureRecognizer.state == UIGestureRecognizerStateBegan){
NSLog(#"UIGestureRecognizerStateBegan.");
//Do Whatever You want on Began of Gesture
}
pgr
= [[UIPanGestureRecognizer alloc]
initWithTarget:self action:#selector(handePanPress:)];
// To detect after how many seconds you want shake the cells
pgr.delegate = self;
[self.collection_view addGestureRecognizer:pgr];
//show the done button here
navButtonDone = [[UIBarButtonItem alloc] initWithTitle:#"Done" style:UIBarButtonItemStylePlain target:self action:#selector(navBtnDone:)];
self.navigationItem.rightBarButtonItem = navButtonDone;
}
when long gesture start i also add the right button on nav bar on press of nav bar button i stop animation & remove the delete button.I able to remove delete button in iPhone 5s but not in iPhone 6.
below is code for that
- (IBAction)navBtnDone:(id)sender
{
if([[[NSUserDefaults standardUserDefaults]valueForKey:#"longPressed"] isEqualToString:#"yes"])
{
[[NSUserDefaults standardUserDefaults]setValue:#"no" forKey:#"longPressed"];
[_deleteButton removeFromSuperview];
[self.collection_view reloadData];
[self.collection_view removeGestureRecognizer:pgr];
self.navigationItem.rightBarButtonItem=nil;
}
}
Here i have just added [_deleteButton removeFromSuperview]; how can i get cell in each function & remove the delete button.

Answer 1

To retrieve the cell based on its indexpath you can call
UICollectionViewCell *someCell = [myCollectionView cellForItemAtIndexPath:indexPath];
Then remove the delete button with
if (someCell) {
// Remove the delete button on the cell.
[someCell.deleteButton removeFromSuperView];
}

Answer 2

There are two ways.
To Store the IndexPath in a global variable.
In your .h
NSIndexPath *globalIndexPath
In your Gesture Recogniser
-(void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer
{
p = [gestureRecognizer locationInView:self.collection_view];
globalIndexPath = [self.collection_view indexPathForItemAtPoint:p];
//Other Stuff
}
In your Delete button action
- (IBAction)navBtnDone:(id)sender
{
//Other Stuff
UICollectionViewCell *cell = [myCollectionView cellForItemAtIndexPath: globalIndexPath];
if (cell) {
[cell.deleteButton removeFromSuperView];
}
}
Set the Indexpath.row value to the Barbutton's tag value
-(void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer
{
p = [gestureRecognizer locationInView:self.collection_view];
NSIndexPath *indexPath = [self.collection_view indexPathForItemAtPoint:p];
//Other Stuff
//show the done button here
navButtonDone = [[UIBarButtonItem alloc] initWithTitle:#"Done" style:UIBarButtonItemStylePlain target:self action:#selector(navBtnDone:)];
navButton.tag = indexPath.row //IMPORTANT
self.navigationItem.rightBarButtonItem = navButtonDone;
}
In your Button Action
- (IBAction)navBtnDone:(id)sender
{
UIBarButtonItem *btn = (UIBarButtonItem *)sender;
UItableViewCell *cell = [myCollectionView cellForItemAtIndexPath: [NSIndexPath indexPathWithRow: btn.tag inSection:0]];
[cell.deleteButton removeFromSuperView];
}