cannot register delegate and data source of UITableView inside UITableViewCell - ios

Question

it says
Assigning to 'id _Nullable' from incompatible
type 'ChildTableViewCell *__strong'
is there any mistake if i implement UITableView cell inside custom UITableViewCell ?
So first in MainViewController, Using MainView that have UITableView,
in the MainViewController, especially in ViewDidLoad, i register self.mainView.tableView.delegate = self; also self.mainView.dataSource = self;
and in - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath i have this:
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath {
if ([self.filteredCategoriesAllListLocalDataArray count] > 0) {
static NSString *cellID = #"ChildTableViewCell";
ChildTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];
if(nil == cell) {
cell = [[ChildTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:cellID];
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
}
CategoryModel *currentCategory = [self.filteredCategoriesAllListLocalDataArray objectAtIndex:indexPath.section];
ChildModel *currentChildData = [currentCategory.childModelArray objectAtIndex:indexPath.row];
NSLog(#"================== %#", currentChildData.nameString);
cell.childData = currentChildData;
[cell initializeChildTableView];
cell.clipsToBounds = YES;
return cell;
}
UITableViewCell *cell = [[UITableViewCell alloc] init];
return cell;
}
and then in ChildTableViewCell i have this:
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
_tableView = [[UITableView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, CGRectGetWidth([UIScreen
mainScreen].bounds), CGRectGetHeight(self.contentView.frame))style:UITableViewStyleGrouped];
self.tableView.showsVerticalScrollIndicator = NO;
self.tableView.showsHorizontalScrollIndicator = NO;
self.tableView.separatorStyle = UITableViewCellSeparatorStyleSingleLine;
self.tableView.backgroundColor = [UIColor whiteColor];
self.tableView.scrollEnabled = NO;
self.tableView.delegate = self;
self.tableView.dataSource = self;
[self.contentView addSubview:self.tableView];
}
return self;
}
but in step 4, got this error message:
Assigning to 'id _Nullable' from incompatible
type 'ChildTableViewCell *__strong'
im Using UITableView inside UItableViewCell cause want to make UITAbleView Tree Level with custom data, i've been search all reference for UITableView Multi level but it doesn't help at all.