如何在 UITableView 中添加分页。？ [关闭]

Question

我从 API 解析第一页的数据并将其添加到 UITableView，现在页面可以是多个，比如说 100，我也从 API 获得总页数。但是我将如何在 tableView 中为每个页面实现它并在滚动时显示指示器。看看我的代码

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;
}

Answer 1

有很多方法可以实现这一点，如下所示：

• 首先，您需要创建一个全局NSMutableArray，它会加载到TableView Delegates 和DataSaurce。
• 现在在您的 api 调用中，您需要在全局数组中添加该记录。
• 在最后一个单元格或tableview 上，您可以根据您的 API 使用下一页 URL 再次调用它，并在每次调用时重新加载表
• 您可以使用 github 上提供的更多第三方库进行加载：

https://github.com/OpenFibers/DragRefreshAndLoadMoreTableDemo

https://github.com/Abizern/PartialTable

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

根据您的代码：

在 .h 类中

#import <UIKit/UIKit.h>

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

}

.M 类

- (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];
}

Answer 2

声明一个全局变量pagingCount，并在viewdidload中初始化为1。

在您的数据获取器方法中进行此更改。

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

现在您将传递此分页计数并在最后一个单元格即将显示时调用您的数据获取器方法。 用 +1 更新分页计数

- (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
            }
         }

Answer 3

我用下面的代码做了同样的事情

#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
}