1.UITableView多選時設定預設選中幾個cell

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];
    cell.multipleSelectionBackgroundView = [[UIView alloc] initWithFrame:cell.bounds];
    cell.multipleSelectionBackgroundView.backgroundColor = [UIColor clearColor];
    cell.selectionStyle = UITableViewCellSelectionStyleDefault;
    
    
    //預設選中上次選中的cell
    for (NSIndexPath *index in self.indexsArr) {
        if (index == indexPath) {
            [tableView selectRowAtIndexPath:indexPath animated:YES scrollPosition:(UITableViewScrollPositionNone)];
            break;
        }
    }

    return cell;
}
 

            [self.view addSubview:self.collectionView];
            
            //預設選中
            for (NSIndexPath *index in self.indexArr) {
                [self.collectionView selectItemAtIndexPath:index animated:YES scrollPosition:(UICollectionViewScrollPositionNone)];
            }
 

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
 ......
    cell.selectedBackgroundView = [[UIView alloc] initWithFrame:cell.bounds];
    cell.selectedBackgroundView.backgroundColor = [UIColor colorWithHexString:Color_Blue];

    return cell;
}