Parse.com - How to get PFQueryTableViewController , Pagination working with UISearchDisplayController? - objective-c

Question

I am trying to add Search to Todo demo application. I have below code so far with Search working. The issue with below code is that the Pagination doesn't work anymore. There is simlilar question about pagination but when "number of rows in section + 1" returned, the app crashes with [__NSArrayM objectAtIndex:] error. How do I get the Pagination working?
// MyTableController.h
#import <Parse/Parse.h>
#interface MyTableController : PFQueryTableViewController
#end
// MyTableController.m
#import "MyTableController.h"
#interface MyTableController() <UISearchDisplayDelegate> {
}
#property (nonatomic, strong) UISearchBar *searchBar;
#property (nonatomic, strong) UISearchDisplayController *searchController;
#property (nonatomic, strong) NSMutableArray *searchResults;
#end
#implementation MyTableController
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
self.className = #"Todo";
self.keyToDisplay = #"text";
self.pullToRefreshEnabled = YES;
self.paginationEnabled = YES;
self.objectsPerPage = 5;
}
return self;
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
self.searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 44)];
self.tableView.tableHeaderView = self.searchBar;
self.searchController = [[UISearchDisplayController alloc] initWithSearchBar:self.searchBar
contentsController:self];
self.searchController.searchResultsDataSource = self;
self.searchController.searchResultsDelegate = self;
self.searchController.delegate = self;
CGPoint offset = CGPointMake(0, self.searchBar.frame.size.height);
self.tableView.contentOffset = offset;
self.searchResults = [NSMutableArray array];
}
- (void)viewDidUnload
{
[super viewDidUnload];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (void)filterResults:(NSString *)searchTerm {
[self.searchResults removeAllObjects];
PFQuery *query = [PFQuery queryWithClassName: self.className];
[query whereKey:#"text" containsString:searchTerm];
NSArray *results = [query findObjects];
[self.searchResults addObjectsFromArray:results];
}
- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {
[self filterResults:searchString];
return YES;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if (tableView == self.tableView) {
return self.objects.count;
} else {
return self.searchResults.count ;
}
}
#pragma mark - Parse
- (void)objectsDidLoad:(NSError *)error {
[super objectsDidLoad:error];
}
- (void)objectsWillLoad {
[super objectsWillLoad];
}
- (PFQuery *)queryForTable {
PFQuery *query = [PFQuery queryWithClassName:self.className];
if ([self.objects count] == 0) {
query.cachePolicy = kPFCachePolicyCacheThenNetwork;
}
[query orderByAscending:#"priority"];
return query;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath object:(PFObject *)object {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
cell.textLabel.text = [object objectForKey:#"text"];
cell.detailTextLabel.text = [NSString stringWithFormat:#"Priority: %#", [object objectForKey:#"priority"]];
return cell;
}
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[super tableView:tableView didSelectRowAtIndexPath:indexPath];
}
#end

Answer 1

In your own implementation of numberOfRowsInSection you must return numberOfRows + 1. But then you must write your code considering you have more cells than query returning. Check out your heightForRowAtIndexPath and others methods: there can be calls to [self.objects objectAtIndex:self.objects.count]. I mean, if indexPath.row == self.objects.count, its a "Load More" cell.
If you overriding willSelectRowAtIndexPath or didSelectRowAtIndexPath, you must do this in the top of method
[super tableView:tableView didSelectRowAtIndexPath:indexPath];
or add this (previous case is prefered)
if (indexPath.row == self.objects.count)
{
[self loadNextPage];
}
Customization of Load More cell placed in -(PFTableViewCell *)tableView:(UITableView *)tableView cellForNextPageAtIndexPath:(NSIndexPath *)indexPath
And im using
-(PFTableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath
instead of
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: