How to add pagination in UITableView.?

Question

I parse data from API for the first page and add it to UITableView, now pages can be multiple lets say 100, I also get total number of pages from API also. but how will i implement it in tableView for every page and show indicator while scrolling. Have a look at my code

NSURL *theURL = [NSURL URLWithString:@"http://qa.networc.in:1336/api/dispatcher/rideScheduled/:1"];
NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:theURL      cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:20.0f];

//Specify method of request(Get or Post)
[theRequest setHTTPMethod:@"GET"];

//Pass some default parameter(like content-type etc.)
[theRequest setValue:@"application/json" forHTTPHeaderField:@"Accept"];
[theRequest setValue:@"application/json; charset=UTF-8" forHTTPHeaderField:@"Content-Type"];

[theRequest addValue:token forHTTPHeaderField:@"x-access-token"];
NSURLResponse *theResponse = NULL;
NSError *theError = NULL;

NSData *responseData = [NSURLConnection sendSynchronousRequest:theRequest returningResponse:&theResponse error:&theError];
if (responseData == nil)
{
    return;
}

NSDictionary *dataDictionaryResponse = [NSJSONSerialization JSONObjectWithData:responseData options:0 error:&theError];
NSLog(@"url to send request= %@",theURL);
NSLog(@"%@",dataDictionaryResponse);



NSURLSession *session = [NSURLSession sharedSession];

NSURLSessionDataTask *task = [session dataTaskWithRequest:theRequest
                                        completionHandler:
                              ^(NSData *data, NSURLResponse *response, NSError *error) {

                                  NSLog(@"Response:%@ %@\n", response, error);
                                  if(error == nil)
                                  {

                                      NSString * text = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
                                      NSLog(@"Data = %@",text);
                                  }

                                  dictionary = [[NSJSONSerialization JSONObjectWithData:data options:0 error:nil]objectForKey:@"data"];

                                  NSArray *total =  [dictionary objectForKey:@"total"];
                                  NSLog(@"latlop %@", total);




                                  NSArray *IDArray = [dictionary objectForKey:@"docs"];
                                  for (NSDictionary *Dict in IDArray)
                                  {

                                      NSMutableDictionary *temp = [NSMutableDictionary new];
                                      [temp setObject:[Dict objectForKey:@"_id"] forKey:@"_id"];

                                      NSLog(@"temp %@", temp );

                                      NSString *booknumber = [Dict objectForKey:@"bookingNumber"];
                                      if([booknumber length] != 0)
                                          [temp setObject:booknumber forKey:@"bookingNumber"];

                                      NSMutableDictionary *stp1 = [Dict objectForKey:@"stop1"];

                                      if ([[stp1 allKeys] containsObject:@"address"]) {

                                          [temp setObject:[stp1 objectForKey:@"address"] forKey:@"address"];




                                          ];

                                      }

                                      NSMutableDictionary *stp2 = [Dict objectForKey:@"stop2"];

                                      if ([[stp2 allKeys] containsObject:@"address"]) {

                                          [temp setObject:[stp2 objectForKey:@"address"] forKey:@"address1"];


                                          NSArray *latlongstp2 =  [stp2 objectForKey:@"location"];
                                          [temp setObject:[latlongstp2 objectAtIndex:0] forKey:@"latitude"];
                                          [temp setObject:[latlongstp2 objectAtIndex:1] forKey:@"longitude"];

                                      }



                                      NSMutableDictionary *currentloc = [Dict objectForKey:@"currentLocation"];

                                      if ([[currentloc allKeys] containsObject:@"address"]) {

                                          [temp setObject:[currentloc objectForKey:@"address"] forKey:@"address1"];


                                      }


                                      [getid addObject:temp];

                                  }


                                  if (getid.count>0)
                                  {
                                      [self updateTable];
                                  }



                              }];

[task resume];

}


- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;    //count of section
}


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {


    return [getid count];
}

- (void)tableView:(UITableView *)tableView willDisplayCell: (UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.row == [getid count] - 1 ) {

    }
}


- (UITableViewCell *)tableView:(UITableView *)tableView
         cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    ScheduleTableViewCell *cell   = [tableView      dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];

    cell.BookingId.text  = [[getid        objectAtIndex:indexPath.row]objectForKey:@"_id"];
    cell.BookingNo.text  = [[getid objectAtIndex:indexPath.row]objectForKey:@"bookingNumber"];
    cell.stop1.text  = [[getid objectAtIndex:indexPath.row]objectForKey:@"address"];
    cell.stop2.text = [[getid objectAtIndex:indexPath.row] objectForKey:@"address1"];
    cell.Currentloc.text = [[getid objectAtIndex:indexPath.row]  objectForKey:@"address"];


    return cell;
}

The are number of techniques out there on internet for implementing pagination along with good examples. Try those and modify them to suit your need. Here is a good example - http://www.iosnomad.com/blog/2014/4/21/fluent-pagination — Rohan Sanap, May 31 '16 at 05:35
I don't think the example link I specified use any third party library for pagination. They have merely explained logic with example. Anyways, here is another one - https://grokswift.com/rest-tableview-in-swift/ — Rohan Sanap, May 31 '16 at 05:42

score 4 · Accepted Answer · edited Apr 02 '18 at 15:04

There are many way to achieve this like following way:

First you need to create one global NSMutableArray that load in TableView Delegates and DataSaurce.
Now on your api call you need to add That records in global Array.
On last cell or the tableview you can call it again with next page URL based on your API and reload table on each Call
You can use for loadMore many thirdParty library available on github:

https://github.com/OpenFibers/DragRefreshAndLoadMoreTableDemo

https://github.com/Abizern/PartialTable

https://github.com/robertmryan/UITableView-Bottom-Refresh

Based On your code:

in .h class

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
   NSURL* nextURL;
    int currentPage;

}

in .M Class

- (void)viewDidLoad {

    currentPage = 1;

    [self LoadData];
    [super viewDidLoad];

}


-(void)LoadData
{

    NSURL *theURL = [NSURL URLWithString:[NSString stringWithFormat:@"http://qa.networc.in:1336/api/dispatcher/rideScheduled/:%d",currentPage]];
    NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:theURL      cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:20.0f];

    //Specify method of request(Get or Post)
    [theRequest setHTTPMethod:@"GET"];

    //Pass some default parameter(like content-type etc.)
    [theRequest setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    [theRequest setValue:@"application/json; charset=UTF-8" forHTTPHeaderField:@"Content-Type"];

    [theRequest addValue:token forHTTPHeaderField:@"x-access-token"];
    NSURLResponse *theResponse = NULL;
    NSError *theError = NULL;

    NSData *responseData = [NSURLConnection sendSynchronousRequest:theRequest returningResponse:&theResponse error:&theError];
    if (responseData == nil)
    {
        return;
    }

    NSDictionary *dataDictionaryResponse = [NSJSONSerialization JSONObjectWithData:responseData options:0 error:&theError];
    NSLog(@"url to send request= %@",theURL);
    NSLog(@"%@",dataDictionaryResponse);



    NSURLSession *session = [NSURLSession sharedSession];

    NSURLSessionDataTask *task = [session dataTaskWithRequest:theRequest
                                            completionHandler:
                                  ^(NSData *data, NSURLResponse *response, NSError *error) {

                                      NSLog(@"Response:%@ %@\n", response, error);
                                      if(error == nil)
                                      {

                                          NSString * text = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
                                          NSLog(@"Data = %@",text);
                                      }


                                      currentPage ++;
                                      dictionary = [[NSJSONSerialization JSONObjectWithData:data options:0 error:nil]objectForKey:@"data"];

                                      NSArray *total =  [dictionary objectForKey:@"total"];
                                      NSLog(@"latlop %@", total);


                                      [getid addObjectsFromArray:total];

                                       [self updateTable];

                                  }];

    [task resume];
}

why you doing too much code when you get response. once you get responce you just need to add this in to your master array and reload it. Do code in CellForRowIndex based on your master array. — Nitin Gohel, May 31 '16 at 05:50
sir how will i add next page in url from cellfroindexpath method — sandeep tomar, May 31 '16 at 05:54
create one variable that assign nexturl. mean once you call at the success time you create next url with new page number and assing it to the next time calling string — Nitin Gohel, May 31 '16 at 05:55
sir can you edit in my code for a little bit hint please, if it is possible — sandeep tomar, May 31 '16 at 06:01
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/113372/discussion-between-nitin-gohel-and-sandeep-tomar). — Nitin Gohel, May 31 '16 at 06:19
yes sir thanks for your answer i am working on it please wait some time — sandeep tomar, May 31 '16 at 07:07
no yet sir, Actualy i get total number of page in getid, but i am not able to scroll in that way, because i need to add some value on cells according to page wise sir — sandeep tomar, Jun 01 '16 at 10:02
i am getting response from viewdidload method, is it necessary to again parse response in load data method? — sandeep tomar, Jun 01 '16 at 10:06

score 3 · Answer 2 · answered May 31 '16 at 05:47

declare a global variable pagingCount and initialize it with 1 in viewdidload.

make this change in your data fetcher method.

NSURL *theURL = [NSURL URLWithString:@"http://qa.networc.in:1336/api/dispatcher/rideScheduled/:%d",pagingCount];

now you will pass this paging count & call your data fetcher method whenever the last cell is about to display. update the paging count with +1

- (void)tableView:(UITableView *)tableView willDisplayCell: (UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.row == [getid count] - 1 ) {
//call your method of fetching data with paging which will be increased with 1
//increase the pagingCount
pagingCount += 1;

//call your data fetcher
            }
         }

score 0 · Answer 3 · answered May 31 '16 at 05:44

I was done same using following code

#pragma mark --- UIScrollView Delegate Method ---

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    float offset = (scrollView.contentOffset.y - (scrollView.contentSize.height - scrollView.frame.size.height));
    btnloadMore.hidden = YES;

    if (offset >= 0 && offset <= 105)
    {
        if(isLoadMoreCheck == TRUE)
        {
            NSLog(@"Hi");
            //btnloadMore.hidden = NO;
            [self addMoreData];
        }
    }

    NSLog(@"Scroll : %f",offset);
}

- (void)addMoreData
{
    isLoadMoreCheck = FALSE;
    isLoadMore = TRUE;
    currentPage++;
    [self getNewsFeeds:currentPage];// Here you can call your method for load next page data
}

How to add pagination in UITableView.?

3 Answers3

Linked