UICollectionView嵌入在UITableViewCell中！ 无法从tableview单元格显示ViewController！ 回电

Question

I have a UICollectionView which is embedded in a UITableViewCell . The delegates and datasources of the UICollectionView are all given in the UITableViewCell class . I need to present a UIViewController on the click of an item in the UICollectionView . But as the properties of the collectionview are written in the UITableViewCell I can't really present another UIViewController from that. Please help!

The tableView delegates:

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section;
{
        return books.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
{
        static NSString *CellIdentifier = @"CategoryTableViewCell";

        CategoryTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
        if (cell == nil) {
                cell = [[CategoryTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        }
        dict = [[NSDictionary alloc]init];
        dict = books[indexPath.row];
        NSString *categoryID = [dict[@"category"] stringValue];
        cell.booksArray = dict[@"books"];
        cell.categoryNameLabel.text = [self getCategoryNameForCategory:categoryID];
        [cell.collectionView reloadData];
        return cell;
}

The collectionView delegates which is inside the tableview cell.

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

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
        return _booksArray.count;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
        static NSString *identifier = @"bookCollectionViewCell";

        BookCollectionViewCell *cell = (BookCollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
        dict = [[NSDictionary alloc]init];
       dict = _booksArray[indexPath.item];
        NSString *imgString = [NSString stringWithFormat:@"http://test.valmeeki.com/images/front_covers/%@.jpg",dict[@"id"]];
        NSUserDefaults *prefs = [[NSUserDefaults alloc]init];
        [prefs setObject:imgString forKey:@"bookcoverimg"];
        [cell.imageView sd_setImageWithURL:[NSURL URLWithString:imgString]
                          placeholderImage:[UIImage imageNamed:@"nik_bg_01.png"]];

        cell.costLabel.text = [NSString stringWithFormat:@"Rs %@",[dict[@"price"] stringValue]];

        cell.titleLabel.text = dict[@"title"];

        cell.authoLabel.text = dict[@"authorName"];
        return cell;
}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
        NSUserDefaults *prefs = [[NSUserDefaults alloc] init];
        [prefs setObject:dict[@"title"] forKey:@"booktitle"];
        [prefs setObject:dict[@"authorName"] forKey:@"authorname"];
        [prefs setObject:dict[@"numDownloads"] forKey:@"bookdownloads"];
        [prefs setObject:dict[@"rating"] forKey:@"bookratings"];
        [prefs setObject:dict[@"price"] forKey:@"bookprice"];
        [prefs setObject:dict[@"synopsis"] forKey:@"booksynopsis"];
        [prefs setObject:dict[@"id"] forKey:@"bookid"];
        NSLog(@"%@",dict[@"title"]);
 SideMenuCategories *monitorMenuViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"SideMenuCategories"];

        [self presentViewController:monitorMenuViewController animated:NO completion:nil];


}

Answer 1

Hi i have fixed that issue !!

typedef void(^categorycallback)();

Give this code in your tableviewcell header

 Viewcontrollertobecalled *getcall = [[Viewcontrollertobecalled alloc] init];
        [getcall callthehome];
        if(self.callback)
        {
                self.callback();

        }

Add this code in the didselectrow of the tableview in tableviewcell.m

Catch the call back in the Viewcontroller class and give your code to present your viewcontroller .

   cell.callback = ^(){
                NavigationViewStore *questionnaireNavController = [self.storyboard instantiateViewControllerWithIdentifier:@"NavigationViewStore"];
                               [questionnaireNavController setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
                HomeViewController *qvc = (HomeViewController *)[questionnaireNavController topViewController];

               [self presentViewController:questionnaireNavController animated:NO completion:nil];
        };

Answer 2

Write Delegate methods for tableviewcell then set this delegate to view controller then pass the collectionview item selection message to view controller through the delegate methods you have implemented on the viewcontroller

declare the below protocol methods on your subclassed tableViewcell as a delegate method

-(void)tableViewcell:(id)sender didSelectCollectionItemAtIndexPath:(NSIndexpath*)path;

with the help of the above method you can pass the selected indexpath to the viewController

Answer 3

In your CategoryTableViewCell implementation, the method didSelectItemAtIndexPath contains this line of code:

[self presentViewController:monitorMenuViewController animated:NO completion:nil];

Here, self refers to your CategoryTableViewCell , which is not a subclass of UIViewController , therefore you can't really present anything on it. What you can do is, however, you can access the UITableView that contains your CategoryTableViewCell , and then access the UIViewController (or UITableViewController ) holding it.

Something of this sort should work:

UITableView *tableView = self.superview.superview;
UIViewController *viewController = tableView.dataSource;
[viewController presentViewController:monitorMenuViewController animated:NO completion:nil];

And please note that Apple can change the view hierarchy at anytimes, so in the upcoming versions of iOS, self.superview.superview might not give you the UITableView containing your cell. So this is a messy way of doing this, but it shouldn't cause any problem for the current version of iOS.