想要在UITableView中从右向左滑动显示删除按钮

Question

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    return YES;
}

- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath{
    return UITableViewCellEditingStyleDelete;
}


- (void)tableView:(UITableView *)tableView commitEditingStyle(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{

    if(editingStyle == UITableViewCellEditingStyleDelete){
        //[theSimpsons removeObjectAtIndex:indexPath.row];

        NSString *time = [[arrayList objectAtIndex:indexPath.row] objectForKey:@"TIME"];
        NSString *date= [[arrayList objectAtIndex:indexPath.row] objectForKey:@"DATE"];
        DBManager *dbm = [[DBManager alloc] init];
        [dbm initiallzeDatabase];
        [dbm deleteItemAtIndexPath:time :date];

        //arrayList = [dbm getParkResults];
        //[parkTableView reloadData];

        [arrayList removeObjectAtIndex:indexPath.row];

        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
    }
}

I have used the above code in my app. The editing part works fine, but the thing is, the delete button appears only when we swipe from left-to-right on a cell. Now i have a menu that opens on left-to-right swipe like Facebook. So how can i make sure that the delete button appears when the user swipes from right-to-left.

Answer 1

Please dont set the delegate to UISwipeGestureRecognizer

Write this in viewDidLoad or where you have initiated your UITableView

 UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(callYourMethod:)];
 swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
 [self.tblView addGestureRecognizer:swipeRight];

No need to write anything in the below method.

- (void)callYourMethod:(UISwipeGestureRecognizer *)recognizer
{

}

Answer 2

This might work. Put this code in awakeFromNib or init :

UISwipeGestureRecognizer *swipeDelete = [[UISwipeGestureRecognizer alloc]     initWithTarget:self action:@selector(handleSwipeDelete:)];
[swipeDelete setDirection: UISwipeGestureRecognizerDirectionLeft];
[yourTableView addGestureRecognizer:swipeDelete];

then in handleSwipeDelete organize your cell and show delete button. You will probably need to handle cell state and change it on swipeLeft/swipeRight.

Answer 3

看起来你需要自定义UITableViewCell的行为，我从未注意到Apple从右向左滑动后提供了这种行为....

Answer 4

You can got it by using two Methods of UITableVie.

// This only needs to be implemented if you are going to be returning NO
// for some items. By default, all items are editable.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
    // Return YES if you want the specified item to be editable.
    return YES;
}

// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        //add code here for when you hit delete
     //When you remove a cell of your tableview, you also has to remove your array object at index x
    }    
}

After removing the object. You have to reload the UITableView .

[self.tableView reloadData];

For More Information Read This OfficialDocumentaion.