写刷新加载，我用到的是第三方框架，首先您可以到github下载MJRefresh框架，接下来看代码。

//
//  EAHTTPCliecnt.h
//  HTTPClient
//
//  Created by Eiwodetianna on 2017/8/16.
//  Copyright © 2017年 lanou. All rights reserved.
//

#import <Foundation/Foundation.h>

typedef void(^EASuccessBlock)(id reponseObject);
typedef void(^EAFailureBlock)(NSError *error);

@interface EAHTTPClient : NSObject

+ (void)GET:(NSString *)URLString parameters:(NSDictionary *)parameters success:(EASuccessBlock)success failure:(EAFailureBlock)failure;

+ (void)POST:(NSString *)URLString parameters:(NSDictionary *)parameters success:(EASuccessBlock)success failure:(EAFailureBlock)failure;

@end

//
//  EAHTTPCliecnt.m
//  HTTPClient
//
//  Created by Eiwodetianna on 2017/8/16.
//  Copyright © 2017年 lanou. All rights reserved.
//

#import "EAHTTPClient.h"

typedef NS_ENUM(NSUInteger, EAHTTPMethod) {
    EAHTTPMethodGET,
    EAHTTPMethodPOST,
};

@interface EAHTTPClient ()

@end

@implementation EAHTTPClient

+ (void)GET:(NSString *)URLString parameters:(NSDictionary *)parameters success:(EASuccessBlock)success failure:(EAFailureBlock)failure {
    
    [self requestWithURLString:URLString parameters:parameters method:EAHTTPMethodGET success:success failure:failure];
    
}

+ (void)POST:(NSString *)URLString parameters:(NSDictionary *)parameters success:(EASuccessBlock)success failure:(EAFailureBlock)failure {
    
    [self requestWithURLString:URLString parameters:parameters method:EAHTTPMethodPOST success:success failure:failure];
}

+ (void)requestWithURLString:(NSString *)URLString parameters:(NSDictionary *)parameters method:(EAHTTPMethod)method success:(EASuccessBlock)success failure:(EAFailureBlock)failure { 
    
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    // 设置请求超时时间
    request.timeoutInterval = 60.f;
    
    NSMutableArray *parameterArray = [NSMutableArray array];
    for (NSString *key in parameters) {
        NSString *parameterString = [NSString stringWithFormat:@"%@=%@", key, parameters[key]];
        [parameterArray addObject:parameterString];
    }
    NSString *query = [parameterArray componentsJoinedByString:@"&"];
    
    switch (method) {
        case EAHTTPMethodGET:{
            request.HTTPMethod = @"GET";
            URLString = [URLString stringByAppendingFormat:@"?%@", query];
            break;
        }
        case EAHTTPMethodPOST: {
            request.HTTPMethod = @"POST";
            request.HTTPBody = [query dataUsingEncoding:NSUTF8StringEncoding];
            break;
        }
    }
    
    // 网络请求时将URL转变为合法格式
    URLString = [URLString stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
    NSURL *url = [NSURL URLWithString:URLString];
    request.URL = url;
    
    NSURLSession *session = [NSURLSession sharedSession];
    // 加载数据任务
    // 参数1：请求对象
    // 参数2：请求结束后回调函数
    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        // 返回主线程
        dispatch_async(dispatch_get_main_queue(), ^{
            if (!error) {
                id result = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
//                id result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
                success(result);
            } else {
                failure(error);
            }
            
        });
    }];
    // 执行任务
    [dataTask resume];
}

@end

//
//  ViewController.m
//  UI12_刷新加载
//
//  Created by lanou3g on 17/8/18.
//  Copyright © 2017年 lanou3g. All rights reserved.
//

#import "ViewController.h"
#import "MJRefresh.h" //主头文件
#import "EAHTTPClient.h"
#import "Song.h"

@interface ViewController () <UITableViewDelegate,UITableViewDataSource>
@property (nonatomic,retain) NSMutableArray *songArray;
@property (nonatomic,retain) UITableView *tableView;
@property (nonatomic,assign,getter=isRefresh) BOOL refresh;
@property (nonatomic,assign) NSInteger page;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.songArray = [NSMutableArray array];
    self.tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
    self.tableView.delegate = self;
    self.tableView.dataSource = self;
    self.tableView.backgroundColor = [UIColor whiteColor];
    [self.view addSubview:self.tableView];
    self.tableView.mj_header = [MJRefreshNormalHeader headerWithRefreshingBlock:^{
        
        NSLog(@"olivia");
        self.refresh = YES;
        self.page = 1;
        [self loadDataWithPage:self.page];
        //结束刷新
        [self.tableView.mj_header endRefreshing];
    }];
    //自动刷新
    [self.tableView.mj_header beginRefreshing];
    self.tableView.mj_footer = [MJRefreshBackNormalFooter footerWithRefreshingBlock:^{
        NSLog(@"lee");
        self.refresh = NO;
//        [self.tableView.mj_footer endRefreshing];
        self.page++;
        [self loadDataWithPage:self.page];
    }];
}

- (void)loadDataWithPage:(NSInteger)pageNumber {
    NSString *URLString = @"http://172.18.26.201/get.php";
    NSDictionary *parameters = @{@"page":[NSString stringWithFormat:@"%ld",pageNumber]};
    
    //网络请求
    [EAHTTPClient GET:URLString parameters:parameters success:^(id reponseObject) {
        
        if (self.isRefresh) {
            [self.songArray removeAllObjects];
            [self.tableView.mj_header endRefreshing];
        }else {
            [self.tableView.mj_footer endRefreshing];
        }
        
        for (NSDictionary *songDic in reponseObject) {
            Song *song = [[Song alloc] init];
            [song setValuesForKeysWithDictionary:songDic];
            [self.songArray addObject:song];
        }
        [self.tableView reloadData];
    } failure:^(NSError *error) {
        
    }];
}

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

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    Song *song = self.songArray[indexPath.row];
    static NSString *cellId = @"cell";
    UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:cellId];
    if (nil == cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellId];
    }
    cell.textLabel.text = song.name;
    cell.detailTextLabel.text = song.singerName;
    return cell;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

//
//  Song.h
//  UI12_刷新加载
//
//  Created by lanou3g on 17/8/18.
//  Copyright © 2017年 lanou3g. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Song : NSObject

@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *number;
@property (nonatomic, copy) NSString *pic;
@property (nonatomic, copy) NSString *singerName;
@property (nonatomic, copy) NSString *url;

@end

//
//  Song.m
//  UI12_刷新加载
//
//  Created by lanou3g on 17/8/18.
//  Copyright © 2017年 lanou3g. All rights reserved.
//

#import "Song.h"

@implementation Song

- (void)setValue:(id)value forUndefinedKey:(NSString *)key {
    
}

@end