Adding Gesture to TableViewCell - uitableview

Question

I'm trying to add a swipe gesture recognizer to a tableViewCell but it doesn't work.
This is the way I create my cell:
CellIdentifier = #"EventsSentCell";
nibObjcet = [[NSBundle mainBundle] loadNibNamed:#"EventsSentCell" owner:self options:nil];
EventsSentCell *cell = [[EventsSentCell alloc] init];
cell = (EventsSentCell *)[nibObjcet objectAtIndex:0];
and this is how my cell is initiated in the .m file:
-(id)init{
self = [super init];
if (self) {
leftSwipe = [[UISwipeGestureRecognizer alloc] init];
leftSwipe.direction= UISwipeGestureRecognizerDirectionLeft;
[leftSwipe addTarget:self action:#selector(swipedLeft)];
[self addGestureRecognizer:leftSwipe];
}
return self;
}
and this is how I declared my gesture recognizer in the .h file:
#property (nonatomic,strong) IBOutlet UISwipeGestureRecognizer *leftSwipe;
But for some reason my method isn't called.
Any ideas?
Thanks
I've tried putting the below code:
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
NSLog(#"%#",gestureRecognizer);
return YES;
}
and the result i'm getting after swiping left is:
<UILongPressGestureRecognizer: 0xa9d99a0; state = Possible; view = <UITableViewCellContentView 0xa9d8ce0>; target= <(action=_longPressGestureRecognized:, target=<EventsSentCell 0xa9d8bb0>)>>

Answer 1

Before answering the actual question, let me point out some other issues in your code.
EventsSentCell *cell = [[EventsSentCell alloc] init];
cell = (EventsSentCell *)[nibObjcet objectAtIndex:0];
First of all, there's no point in these two lines. You're allocating and initializing an instance of EventSentCell without a nib. After doing this you're overwriting cell to point to the instance initialized by loadNibNamed:. You could simplify this to EventsSentCell = (EventsSentCell *)nibObject[0];
But even after these optimizations, this still isn't the recommended way to implement cellForRowAtIndexPath:. You should use registerNib:forCellReuseIdentifier: in viewDidLoad and then use
dequeueReusableCellWithIdentifier:forIndexPath: to get a cell and leave out loading the nib yourself completely.
Next,
#property (nonatomic,strong) IBOutlet UISwipeGestureRecognizer *leftSwipe;
You declare this property as an IBOutlet but you're setting it (as far as I know) only in code, more specifically the init method. You could just leave out the IBOutlet altogether.
And this init method is probably also the cause of your problem. When instantiating a view using loadNibNamed, initWithCoder: is called instead of init. Implement your custom initialization code (adding a gesture recognizer in this case) there and it should work just fine.

Answer 2

Your 'init' method is not getting called, so the gesture recognizer does not get set up.
You could try initialising in awakeFromNib instead, but anyway your cell creation looks unconventional.
Assuming you are using a custom cell class with a Xib file, here is how I would do it.
Create your EventsSentCell object .m and .h files
Create a xib file "EventsSentCell.xib"
In the xib file, delete the default top-level view and replace it with a UITableViewCell (you can drag one out from the objects library). In the identity inspector change it's class to EventsSentCell
In you table viewController's viewDidLoad...
UINib* EventsSentNib = [UINib nibWithNibName:#"EventsSentCell"
bundle:nil];
[self.tableView registerNib:EventsSentNib
forCellReuseIdentifier:#"EventsSentCell"];
In your cellForRowAtIndexPath method:
UITableViewCell *cell =
[tableView dequeueReusableCellWithIdentifier:#"EventsSentCell"];
if (cell == nil) {
cell = [[UITableViewCell alloc]
initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:#"EventsSentCell"];
}
In EventsSentCell.m, trigger your initialisation code from -awakeFromNib
Your initialisation code:
leftSwipe = [[UISwipeGestureRecognizer alloc] init];
leftSwipe.direction= UISwipeGestureRecognizerDirectionLeft;
[leftSwipe addTarget:self action:#selector(swipedLeft)];
[self addGestureRecognizer:leftSwipe];
will work as it is.
You get the UILongPressGestureRecognizer:... response to your gestureRecogniser delegate method because that is a built-in gesture recognizer provided by Apple that has it's delegate set to the cell. When your code is working correctly, if you also set your gesture recongnizer's delegate to the cell (leftSwipe.delegate = self), you would expect to see a simlilar log for UISwipeGestureRecognizer:...
It is also noting that the UILongPressGestureRecognizer's view is NOT the cell, but the cell's contentView. This is the superview for your cell's view hierarchy, to which you should attach all of your cell's content. Although your gesture recognizer works when you attach it to the cell, I would advise following Apple here:
[self.contentView addGestureRecognizer:leftSwipe];
Then the gesture will correctly follow the cell's view hierarchy.