Ios 重新加载UICollectionView单元格后，无法取消选择它

我在UIcollectionView上遇到了一系列问题，我认为解决方法是目前导致问题的原因

        [cell setSelected:YES];
        [self.deviceCollectionView selectItemAtIndexPath:indexPath animated:NO scrollPosition:UICollectionViewScrollPositionNone];

好的，我有一个collectionview，它从一个更新非常频繁的类加载对象，可能每几秒钟更新一次

我遇到的第一个问题；当我选择一个单元格并高亮显示它时，集合视图下方的另一个单元格也高亮显示。我的解决方案是创建一个selectedcells数组，并在新数组中运行一个循环来决定突出显示什么

现在，重新加载collectionview时会出现问题。单元格将继续保持高亮显示并显示为选中状态，但它们不进行注册，因此我无法取消选择

    - (NSInteger)collectionView:(UICollectionView *)view numberOfItemsInSection:        (NSInteger)section
{
    return [self.deviceList count];
}

- (NSInteger)numberOfSectionsInCollectionView: (UICollectionView *)collectionView
{
    return 1;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    DeviceCollectionViewCell *cell = [self.deviceCollectionView dequeueReusableCellWithReuseIdentifier:@"DeviceCell" forIndexPath:indexPath];

    if([self.deviceList count] > indexPath.row)
    {
        cell.device = [self.deviceList objectAtIndex:indexPath.row];
    }

    if ([[self.deviceCollectionView indexPathsForSelectedItems] containsObject:indexPath]) {
        NSLog(@"does it ever?");

       // cell.backgroundColor = [UIColor blueColor];
    }


    for (TDDeviceParser *device in self.selectedDevices)
    {
        if ([cell.device.deviceTextRecord.serialNumber isEqualToString:device.deviceTextRecord.serialNumber])
        {
            [cell setSelected:YES];
            break;
        }
        else
        {
            [cell setSelected:NO];
        }
    }
    return cell;
}

- (UICollectionReusableView *)collectionView: (UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath
{
    UICollectionReusableView *reusableview = nil;
    if (kind == UICollectionElementKindSectionHeader) {
        TitleHeaderForDeviceCollectionView *headerView = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"HeaderView" forIndexPath:indexPath];
        reusableview = headerView;
    }

    else if (kind == UICollectionElementKindSectionFooter) {
        LogoFooterForDeviceCollectionView *footerView = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:@"FooterView" forIndexPath:indexPath];
        reusableview = footerView;
    }
    return reusableview;
}

#pragma mark - UICollectionViewDelegate
- (BOOL)collectionView:(UICollectionView *)collectionView shouldSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    //Iphone Five and Older Ipads: Max2
    int maxCount = 2;
    //ipad 4
    if ([[UIDeviceHardwareVersion platform] isEqualToString:@"iPad3,4"] || [[UIDeviceHardwareVersion platform] isEqualToString:@"iPad3,5"] || [[UIDeviceHardwareVersion platform] isEqualToString:@"iPad3,6"])
    {
        maxCount = 4;
    }
    //Ipod5th,Iphone4 & Iphone4s; Don't select, just play.
    else if ([[UIDeviceHardwareVersion platform] isEqualToString:@"iPod5,1"] ||  [[UIDeviceHardwareVersion platform] isEqualToString:@"iPhone4,1"]  ||  [[UIDeviceHardwareVersion platform] isEqualToString:@"iPhone3,1"]  ||  [[UIDeviceHardwareVersion platform] isEqualToString:@"iPhone3,2"]  ||  [[UIDeviceHardwareVersion platform] isEqualToString:@"iPhone3,3"])
    {
        maxCount = 0;
        //Just play.
        [self.selectedDevices removeAllObjects];
        [self.selectedDevices addObject:[self.deviceList objectAtIndex:indexPath.row]];
        [[TDDeviceManager sharedInstance] removeObserver:self];
        [self performSegueWithIdentifier:@"VideoPlayer" sender:self];
    }

    if (self.selectedDevices.count < maxCount)
    {
        return YES;
    }
    else
    {
        return NO;
    }
}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{



    [self.selectedDevices addObject:[self.deviceList objectAtIndex:indexPath.row]];
    [self updatePlayerImages];
    NSLog(@"device Count %d",self.selectedDevices.count);



}

- (BOOL)collectionView:(UICollectionView *)collectionView shouldDeselectItemAtIndexPath:(NSIndexPath *)indexPath
{

    NSLog(@"Should I Deselect?");
    return YES;
}



- (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath
{
    NSLog(@"%s",__PRETTY_FUNCTION__);
    //What device do we remove?
    for (TDDeviceParser *device in self.selectedDevices)
    {
        if ([device.deviceTextRecord.serialNumber isEqualToString:((TDDeviceParser*)[self.deviceList objectAtIndex:indexPath.row]).deviceTextRecord.serialNumber])
        {
             NSLog(@"%s Removed %@",__PRETTY_FUNCTION__, device.name);
            [self.selectedDevices removeObject:device];
            break;
        }
    }
     NSLog(@"%s Update %d",__PRETTY_FUNCTION__, self.selectedDevices.count);
    [self updatePlayerImages];
}

-（NSInteger）集合视图：（UICollectionView*）视图项编号节：（NSInteger）节
{
返回[自我设备列表计数]；
}
-（NSInteger）collectionView中的节数：（UICollectionView*）collectionView
{
返回1；
}
-（UICollectionViewCell*）collectionView:（UICollectionView*）cv cellForItemAtIndexPath:（NSIndexPath*）indexPath
{
DeviceCollectionViewCell*cell=[self.deviceCollectionView dequeueReusableCellWithReuseIdentifier:@“DeviceCell”forIndexPath:indexPath]；
if（[self.deviceList count]>indexPath.row）
{
cell.device=[self.deviceList objectAtIndex:indexPath.row]；
}
如果（[[self.deviceCollectionView indexPathsForSelectedItems]包含对象：indexPath]）{
NSLog（@“它曾经吗？”）；
//cell.backgroundColor=[UIColor blueColor]；
}
用于（自选择设备中的TDDeviceParser*设备）
{
if（[cell.device.DeviceExtrecord.serialNumber isEqualToString:device.DeviceExtrecord.serialNumber]）
{
[选择的单元格：是]；
打破
}
其他的
{
[所选单元格：否]；
}
}
返回单元；
}
-（UICollectionReusableView*）collectionView:（UICollectionView*）collectionView视图用于种类的SupplementElementOfKind:（NSString*）种类索引路径：（NSIndexPath*）索引路径
{
UICollectionReusableView*reusableview=nil；
if（种类==UICollectionElementKindSectionHeader）{
TitleHeaderForDeviceCollectionView*headerView=[collectionView出列可重用补充视图种类：UICollectionElementKindSectionHeader with ReuseIdentifier:@“headerView”forIndexPath:indexPath]；
reusableview=headerView；
}
else if（种类==UICollectionElementKindSectionFooter）{
LogoFooterForDeviceCollectionView*footerView=[collectionView出列可重用补充视图种类：UICollectionElementKindSectionFooter with ReuseIdentifier:@“footerView”forIndexPath:indexPath]；
reusableview=footerView；
}
返回可重用视图；
}
#pragma标记-UICollectionViewDelegate
-（BOOL）collectionView:（UICollectionView*）collectionView应选择ItemAtIndexPath:（NSIndexPath*）indexPath
{
//Iphone 5及更老的ipad:Max2
int maxCount=2；
//iPad4
如果（[[UIDeviceHardwareVersion platform]IseQualString:@“iPad3,4”]|[UIDeviceHardwareVersion platform]IseQualString:@“iPad3,5”]|[UIDeviceHardwareVersion platform]IseQualString:@“iPad3,6”]）
{
最大计数=4；
}
//iPod5、Iphone4和Iphone4s；不要选择，只需播放即可。
如果（[[UIDeviceHardwareVersion platform]IsequalString:@“iPhone5,1”]|[[UIDeviceHardwareVersion platform]IsequalString:@“iPhone4,1”]|[[UIDeviceHardwareVersion platform]IsequalString:@“iPhone3,1”]|[[UIDeviceHardwareVersion platform]IsequalString:@“iPhone3,2”]|[[UIDeviceHardwareVersion platform]IsequalString:@“iPhone3,3”]）
{
最大计数=0；
//玩吧。
[self.selectedDevices removeAllObjects]；
[self.selectedDevices addObject:[self.deviceList objectAtIndex:indexPath.row]]；
[[TDDeviceManager sharedInstance]移除观察者：self]；
[self-PerformsgueWithIdentifier:@“VideoPlayer”发送方：self]；
}
如果（self.selectedDevices.count

我认为问题在于单元格被选中，但CollectionView不知道单元格被选中。我添加了（第二行）来解决问题

        [cell setSelected:YES];
        [self.deviceCollectionView selectItemAtIndexPath:indexPath animated:NO scrollPosition:UICollectionViewScrollPositionNone];

---

scrollPosition:

采用类型为

UICollectionViewScrollPosition

的值，而不是BOOL。

UICollectionViewScrollPositionNone

是正确的使用值。感谢DTDev提供的解决方案！我遇到了完全相同的问题。