How to add Pagination to Tableview on Search results? - objective-c

Question

The following lines of code shown below are my current tableview settings. What i would like to achieve is what's seen on the image below.
1) if count is 4 when user scrolls Down show a Activity Indicator and Make a request using the next value shown on the JSON Below.
2) Reload the Table
3) Show No more results if count is empty.
Note: I am new on Objective-C so I will appreciate your guidance on this subject since all searches I have done were not successful on what I am looking to achieve since all of them are based on a table already loaded and not based on a Search Result.
As shown on the Image Below is a reference what i want to achieve.
JSON RESPONSE FROM SEARCH
{
"count": 4,
"next": "http://api.domain.com/user-search/?page=2&subject=culture",
"previous": null,
"results": [
{
"name": "Guillermo Davila",
"nick": "guillermo",
"avatar_s": "https://pbs.twimg.com/profile_images/2213685686/image.jpg",
"user_rate": "$10/h",
"id": 3,
"subjects": "Culture and 1 other subject",
"bio": "I'm a nice person"
},
{
"name": "Frank Smith",
"nick": "fsmith",
"avatar_s": "https://pbs.twimg.com/profile_images/2444486/image.jpg",
"user_rate": "$14/h",
"id": 3,
"subjects": "Culture and 1 other subject",
"bio": "I'm a nice person 2"
}
]
}
And here is my UserTableviewController.h
//
// UserTableViewController.m
// mobile-app
//
// Created by eddwinpaz on 5/18/14.
// Copyright (c) 2014 eddwinpaz. All rights reserved.
//
#import "UserTableViewController.h"
#import "CustomTableCell.h"
#import "UserDetailViewController.h"
#import "AFNetworking.h"
#import "MBProgressHUD.h"
#import "SimpleAudioPlayer.h"
#interface UserTableViewController ()
#end
#implementation UserTableViewController
{
// JSON Request
NSMutableArray *myObject;
// A Dictionary Object
NSDictionary *dictionary;
NSString *name;
NSString *subject;
NSString *avatar;
NSString *rate;
NSString *bio;
NSString *nick;
}
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
//[self fetch_tutors]; // Get tutors Ordered By Karma DESC
// Uncomment the following line to preserve selection between presentations.
// self.clearsSelectionOnViewWillAppear = NO;
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Table view data source
/*
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 0;
} */
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return myObject.count; // This is old 100% working code
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"CustomTableCell";
CustomTableCell *cell = (CustomTableCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[CustomTableCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
dictionary = [myObject objectAtIndex:indexPath.row];
cell.labelName.text = [dictionary objectForKey:#"name"];
cell.labelBio.text = [dictionary objectForKey:#"bio"];
cell.labelSubjects.text = [dictionary objectForKey:#"subject"];
cell.imageAvatar.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[dictionary objectForKey:#"avatar"]]]];
cell.imageAvatar.clipsToBounds = YES;
cell.imageAvatar.layer.cornerRadius = cell.imageAvatar.frame.size.width / 2;
cell.labelRate.text = [dictionary objectForKey:#"rate"];
cell.labelRate.layer.cornerRadius = 5;
[SimpleAudioPlayer playFile:#"upvote.wav"];
return cell;
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"showUserDetail"])
{
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
UserDetailViewController *destViewController = segue.destinationViewController;
NSDictionary *dict = [myObject objectAtIndex:indexPath.row];
destViewController.http_nick = [dict valueForKey:#"nick"];
destViewController.labelName = [dict valueForKey:#"name"];
NSLog(#" Username Sent--->%#", [dict valueForKey:#"nick"]);
NSLog(#" name Sent--->%#", [dict valueForKey:#"name"]);
}
}
-(void)searchBarSearchButtonClicked:(UISearchBar *)searchBar
{
NSString *searchTerm = searchBar.text;
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.mode = MBProgressHUDModeIndeterminate;
hud.labelText = #"Searching Tutors";
[hud show:YES];
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
NSString *url = [NSString stringWithFormat:#"http://api.domain.com/user-search/?subject=%#",searchTerm];
[manager GET:url parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject)
{
NSLog(#"JSON: %#", responseObject);
[hud hide:YES];
int count_total = [[responseObject objectForKey:#"count"] intValue];
if (count_total == 0) {
[myObject removeAllObjects];
NSLog(#"Count is --->0");
}
else {
myObject = [[NSMutableArray alloc] init];
name = #"name";
subject = #"subject";
avatar = #"avatar";
rate = #"rate";
bio = #"bio";
nick = #"nick";
for (NSDictionary *dataDict in [responseObject objectForKey:#"results"])
{
NSString *name_data = [dataDict objectForKey:#"name"];
NSString *subject_data = [dataDict objectForKey:#"subjects"];
NSString *avatar_data = [dataDict objectForKey:#"avatar_s"];
NSString *rate_data = [dataDict objectForKey:#"user_rate"];
NSString *bio_data = [dataDict objectForKey:#"bio"];
NSString *nick_data = [dataDict objectForKey:#"nick"];
NSLog(#"name: %#", name_data);
NSLog(#"subjects: %#",subject_data);
NSLog(#"avatar_s: %#", avatar_data);
NSLog(#"user_rate: %#",rate_data);
NSLog(#"bio: %#",bio_data);
NSLog(#"nick: %#",nick_data);
dictionary = [NSDictionary dictionaryWithObjectsAndKeys:
name_data,name,
subject_data,subject,
avatar_data,avatar,
rate_data,rate,
bio_data, bio,
nick_data, nick, nil];
[myObject addObject:dictionary];
}
}
[self.searchBar endEditing:YES];
[self.searchBar setShowsCancelButton:NO animated:YES];
[self.searchBar sizeToFit];
[self.tableView reloadData];
} failure:^(AFHTTPRequestOperation *operation, NSError *error)
{
NSLog(#"Error: %#", error);
[hud hide:YES];
}];
}
- (BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar
{
[searchBar sizeToFit];
[searchBar setShowsCancelButton:YES animated:YES];
return YES;
}
- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar
{
[self.searchBar endEditing:YES];
[searchBar setShowsCancelButton:NO animated:YES];
self.searchBar.text = nil;
}
/*
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"userDetailView"]) {
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
UserDetailViewController *destViewController = segue.destinationViewController;
destViewController.labelName = [myObject objectAtIndex:indexPath.row];
}
} */
/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the specified item to be editable.
return YES;
}
*/
/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
[tableView deleteRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationFade];
} else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
*/
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
#end

Answer 1

One way to achieve it is,
Return the numberOfCells as one more than the data array
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
return myDataArray +1 ; //myDataArray is the data and One more cell for the last cell (10 out of 46 results cell)
}
In cellForRowAtIndexPath, if your IndexPath.row == myDataArray.count (ie., Last Row) Create a custom cell which looks as in the picture and return the custom cell.
In - (void)tableView:(UITableView *)tableView didEndDisplayingCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath*)indexPath, If the indexPath corresponds to last cell, then Start Request for page 2, once the results are fetched, update the myDataArray and reload the table.