Question

我有一个tableview，我可以添加和删除多个复选标记。唯一的问题是如果我放了3个复选标记并滚动，当我返回时，复选标记消失了。我无法在互联网上的任何地方找到有效的解决方案，而且我尝试了几种变化，但仍然没有。

这是我在cellForRowAtIndex中的代码，它应该保留复选标记。

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {
 static NSString *reuseIdentifier = @"contactCell";
 UITableViewCell *cell = [tableView  dequeueReusableCellWithIdentifier:reuseIdentifier];
NSDictionary *contact = [self.tableData objectAtIndex:indexPath.row];



    UILabel *nameLabel = (UILabel *)[cell viewWithTag:1];
    NSString *firstName = contact[@"firstName"];
    nameLabel.text = [firstName stringByAppendingString:[NSString stringWithFormat:@" %@", contact[@"lastName"]]];

    UILabel *phoneNumber = (UILabel *)[cell viewWithTag:2];
    NSArray *phones = contact[@"phones"];

    if ([phones count] > 0) {
        NSDictionary *phoneItem = phones[0];
        phoneNumber.text = phoneItem[@"value"];
    }

    UIImageView *cellIconView = (UIImageView *)[cell.contentView viewWithTag:888];

    UIImage *image = contact[@"image"];

    cellIconView.image = (image != nil) ? image : [UIImage imageNamed:@"smiley-face"];
    cellIconView.contentScaleFactor = UIViewContentModeScaleAspectFill;
    cellIconView.layer.cornerRadius = CGRectGetHeight(cellIconView.frame) / 2;




// Need to fix
if([checkedIndexPath isEqual:indexPath])
{
    cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
else
{
    cell.accessoryType = UITableViewCellAccessoryNone;
}


return cell;
}

这是didSelectRowAtIndexPath方法

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath: (NSIndexPath *)indexPath
  {



UITableViewCell* checkCell = [tableView cellForRowAtIndexPath:indexPath];




 if(checkCell.accessoryType == UITableViewCellAccessoryCheckmark)
{
    checkCell.accessoryType = UITableViewCellAccessoryNone;




    NSMutableArray *i = [[NSMutableArray alloc] init];
    for (NSIndexPath *indexPath in [self.tableView indexPathsForSelectedRows]) {
        [i addObject:self.tableData[indexPath.row]];

        // Go inside pull the numbers from the users and save in an NSArray
     //   NSArray *contacts = i;

   //     self.recipients = [[NSMutableArray alloc] init];


        for (NSDictionary* dict in i) {

            // Grab phones
            NSDictionary *contactNumber = [dict objectForKey:@"phones"];

            for (NSDictionary* dict2 in contactNumber) {

                // Grabs the phone numbers
                NSString* value = [dict2 objectForKey:@"value"];
                int index = [self.recipients indexOfObject:value];

                [self.recipients removeObjectAtIndex:index];
                [self.selectedUsers removeObjectAtIndex:index];
                NSLog(@"The number that has a checkmark%@", value);
                NSLog(@"the array of all%@", self.recipients);
                NSLog(@"At index %lu", (unsigned long)[self.recipients indexOfObject:value]);
                // [_recipients addObject:value];
            }

        }
        // NSLog(@"Phone Numbers: %@",_recipients);
    }


}

else
{
    [self getNumber];

    NSLog(@"clicking %@", self.recipients);

    UITableViewCell* cell = [tableView cellForRowAtIndexPath:indexPath];
    cell.accessoryType = UITableViewCellAccessoryCheckmark;
    checkedIndexPath = indexPath;


  }
 }

我找到了解决方案： 您必须将每个indexPath保存到一个数组中（将此代码放在didSelectRowAtIndexPath中），然后在cellForRowAtIndexPath中添加以下代码

if([self.checkedCells containsObject:indexPath]) {
    cell.accessoryType = UITableViewCellAccessoryCheckmark;
} else {
    cell.accessoryType = UITableViewCellAccessoryNone;
}

也在didSelectRowAtIndexPath中确保在取消选择行时删除indexPath。

 if(checkCell.accessoryType == UITableViewCellAccessoryCheckmark) {
    checkCell.accessoryType = UITableViewCellAccessoryNone;
    [self.checkedCells removeObject:indexPath];

我希望这有助于某人。我一整天都在努力。

Answer 1

~~也许您应该检查isEqual功能是否符合您的预期。您可以通过尝试确保：~~

<击>

if (_checkedIndexPath.section == indexPath.section &&
    _checkedIndexPath.row     == indexPath.row)

<击> 如果您仍然无法获得预期结果，请记录section和row的值，以查看其出错的位置。

请注意，如果由于某种原因_checkedIndexPath是弱变量或被取消分配，则此检查将失败。

您还可以检查您的细胞在被修改之前是否正确出列，并且您正在返回正确的细胞。

如果你想存储多个已检查的行，当然，你需要多个indexPath变量（只有一个_checkedIndexPath不会这样做）。

Answer 2

让checkedIndexPath成为@property (nonatomic, strong)并在您引用self.checkedIndexPath时使用didSelectRowAtIndexPath。在cellForRowAtIndexPath退出后，您将失去参考。在checkedIndexPath设置断点并查看public class CustomAuthorize : AuthorizeAttribute { protected override bool AuthorizeCore(HttpContextBase httpContext) { return /*Chech if user is loged in*/ } protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext) { filterContext.HttpContext.Response.Redirect(URL TO REDIRECT); } }，我打赌它是零。

滚动Objective-C

2 个答案: