Call function from UIButton in UICellView - ios

Question

I have UITableView with custom cells. On cell I have a buttons, and a method in my viewController (which contains UITableView)
My button click realisation is inside my myCustomCell class.
And the question is - What is the simplest way to call viewController method from myCustomCell?
I thought about delegates and NSNotificationCenter. But maybe there is another way.
EDIT

Answer 1

Put following lines in your myCustomCell.h
#protocol ButtonTapDelegate
- (void) buttonDidTap:(UIButton*) button;
#end
#property (nonatomic, weak) NSObject<ButtonTapDelegate> *vs_delegate;
-(void) buttonIsPressed;
in your myCustomCell.m
#synthesize vs_delegate;
-(void) buttonIsPressed:(UIButton*)button {
if([delegate conformsToProtocol:#protocol(ButtonTapDelegate)] && [delegate respondsToSelector:#selector(buttonDidTap:)]) {
[vs_delegate buttonDidTap:button];
}
}
In your viewController.h
myViewController : UIViewController <ButtonTapDelegate>
In your viewController.m, inside Method
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
[cell set.Vs_delegate:self];
[cell.button setTag:indexPath.row];
[cell.button addTarget:self action:#selector(buttonIsPressed) forControlEvents:UIControlEventTouchUpInside];
[cell.button buttonIsPressed:indexPath.row];
Put following method inside ViewController.m
- (void) buttonDidTap:(UIButton*) button {
// You have index, by Button's tag.
}

Answer 2

Most efficient and clean way to do this using blocks.
Declare a block property in your cell either TableViewCell or CollectionViewCell.
#property (nonatomic, copy) void(^buttonClickedAtIndexPath)(NSIndexPath *indexPath);
Declare button's action in Cell itself and Call above block in button click event.
-(IBAction)buttonClicked:(id)sender {
// get indexPath here, which will be indexPath of cell.
// you need to set button's tag as indexPath.row
if(self.buttonClickedAtIndexPath) {
self.buttonClickedAtIndexPath (indexPath);
}
}
In your ViewController
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
TableViewCell *cell = // configure cell here.
cell.button.tag = indexPath.row;
cell.buttonClickedAtIndexPath = ^(NSIndexPath *indexPath){
// you can do anything here.
// Call any method using self OR
// perform segue
}
}
If you've CollectionView inside TableViewCell then same things applies.
Make a class MyCollectionViewCell subclassing UICollectionViewCell.
Declare block property in MyCollectionViewCell.
Handle all the events in MyCollectionViewCell (including display data, delegate, datasource for collectionView).
Call a block from MyCollectionViewCell on button click.
Declare a property of MyCollectionViewCell in your TableViewCell.
In your controller's cellForRowAtIndexPath do something like this.
============================================================
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
TableViewCell *cell = // configure cell here.
cell.mycollectionView.buttonClickedAtIndexPath = ^(NSIndexPath *indexPath){
// you can do anything here.
// Call any method using self OR
// perform segue
}
}