CODEWITHSUNDEEP
iosobjective-cuitableview
gemini0725
gemini0725

Reputation: 65

Swipe gesture for UITableview

I have a feeling the answer is going to be "you can't do that", but hope springs eternal!

One scene in my app is a UITableView; the table represents a month and each row is a day of the month. I have a small UIView at the top of the table with a "Prev" and 'Next" button. Selecting next results in the table displaying the next month and Prev causes the prior month to be displayed. All of this works fine.

What I would like to do is add left & right gesture recognizers to move from month to month, performing the same function as the Prev and Next buttons. Please note I don't need anything to happen to/with the UITableViewCell.

When I searched for this on the web, the overwhelming number of posts seems to be how to handle gesture recognizers in a UITableViewCell. This is not helpful in my case.

I am using Objective-C and Xcode 11.3.1.

Any ideas?

Thanks in advance.

Upvotes: 1

Views: 1014

Answers (3)

gemini0725
gemini0725

Reputation: 65

The issue is fixed.

I found that the recognizer worked as I expected if I added the swipe recognizer to my tableview programmatically. But if use the storyboard to add the swipe recognizers, they did not work at all. This is what i was testing when I posted my question.

After digging a bit, I found that the storyboard recognizers needed to be added to the reference outlet collections in my tableview. For whatever reason this did not happen when I added them originally. Once I connected the recognizers to my tableview, everything worked exactly as intended.

Upvotes: 0

PALAK Mobile Team Leader
PALAK Mobile Team Leader

Reputation: 379

Answer in Objective C

same answer like @Alan but just no need to add below line in cellForRowAt method

cell.isUserInteractionEnabled = false
cell.backgroundColor = .random()

Use below method for swipe gesture in TableView

 - (void)viewDidLoad
 {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    UISwipeGestureRecognizer *leftGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeLeftHandler)];
    [self.tableView addGestureRecognizer: leftGestureRecognizer];

    UISwipeGestureRecognizer *rightGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRightHandler)];
    [self.tableView addGestureRecognizer: leftGestureRecognizer];

}

-(void) swipeLeftHandler
{
    NSLog(@"SWIPE Left");
// add same method which you call on next button’s click
}


-(void) swipeRightHandler{
    NSLog(@"SWIPE Right");
// add same method which you call on previous button’s click

}

Upvotes: 0

Alan
Alan

Reputation: 1142

You should be able to do it. By disabling the interaction of each cell you should be able to pass a 'UIGestureRecognizer' to the tableView.

Here is a short example. Sorry I used Swift but you can probably get the gist of it.

After adding the tableView I Added these gestureRecognizers to it. 

let leftGesture = UISwipeGestureRecognizer(target: self, action: #selector(leftSwiped))
    leftGesture.direction = .left
    tableView.addGestureRecognizer(leftGesture)

    let rightGesture = UISwipeGestureRecognizer(target: self, action: #selector(rightSwiped))
    rightGesture.direction = .right
    tableView.addGestureRecognizer(rightGesture)

Each one calls the following functions:

@objc func leftSwiped() {
    print("LEFT")
}

@objc func rightSwiped() {
    print("Right")
}

and in cell for row I just disabled the user interaction of the cell:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell")!
    cell.isUserInteractionEnabled = false
    cell.backgroundColor = .random()
    return cell
}

When I tried it, swiping right and left on the table view would print appropriately in the logger.

Hope this helps, Alan

Upvotes: 1

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