下拉刷新和上拉加载更多（第三方框架MJRefresh）

  1 #import "RootViewController.h"
  2 #import "MJRefresh.h"
  3 @interface RootViewController ()<UITableViewDataSource,UITableViewDelegate,MJRefreshBaseViewDelegate>
  4 {
  5     UITableView *_tableView ;
  6     NSMutableArray *datas;
  7     MJRefreshHeaderView *headerView;
  8     MJRefreshFooterView *footerView;
  9 }
 10 @end
 11 
 12 @implementation RootViewController
 13 
 14 - (void)dealloc
 15 {
 16     [headerView free];
 17     [footerView free];
 18 }
 19 
 20 - (void)viewDidLoad {
 21     [super viewDidLoad];
 22     //初始化tableView
 23     [self initializeTableView];
 24     // 初始化数据
 25     [self initializeData];
 26 }
 27 
 28 - (void)initializeTableView
 29 {
 30     _tableView = [[UITableView alloc] initWithFrame:[[UIScreen mainScreen] bounds] style:UITableViewStylePlain];
 31     _tableView.dataSource = self;
 32     [self.view addSubview:_tableView];
 33     // 初始化刷新控件
 34     [self initializeRefreshView];
 35 }
 36 
 37 
 38 - (void)initializeRefreshView
 39 {
 40     // 下拉刷新
 41     headerView = [MJRefreshHeaderView header];
 42     headerView.scrollView = _tableView;
 43     headerView.delegate = self;
 44     
 45     // 上拉加载更多
 46     footerView = [MJRefreshFooterView footer];
 47     footerView.delegate = self;
 48     footerView.scrollView = _tableView;
 49 }
 50 
 51 /**
 52  *  刷新控件进入开始刷新状态的时候调用
 53  */
 54 - (void)refreshViewBeginRefreshing:(MJRefreshBaseView *)refreshView
 55 {
 56     if ([refreshView isKindOfClass:[MJRefreshHeaderView class]]) {
 57         //下拉刷新
 58         [self loadNewData];
 59     }else{
 60         [self loadMoreData];
 61     }
 62 }
 63 /*
 64  * 刷新数据
 65  */
 66 - (void)loadNewData
 67 {
 68     static int count = 1;
 69     NSMutableArray *array = [NSMutableArray array];
 70     //每次刷新五条数据
 71     for (int i = 0; i < 5; i++) {
 72         NSString *str = [NSString stringWithFormat:@"第%d次刷新",count];
 73         [array addObject:str];
 74     }
 75     // 把新数据加到datas前面
 76     NSMutableArray *newArray = [[NSMutableArray alloc] initWithArray:array];
 77     [newArray addObjectsFromArray:datas];
 78     datas = newArray;
 79     [_tableView reloadData];
 80     [headerView endRefreshing];
 81     count++;
 82 }
 83 
 84 /*
 85  * 加载更多数据
 86  */
 87 - (void)loadMoreData
 88 {
 89     static int count = 1;
 90     NSMutableArray *array = [NSMutableArray array];
 91     for (int j = 0; j < 5; j++) {
 92         NSString *str = [NSString stringWithFormat:@"第%d次加载更多",count];
 93         [array addObject:str];
 94     }
 95     [datas addObjectsFromArray:array];
 96     [_tableView reloadData];
 97     [footerView endRefreshing];
 98     count++;
 99 }
100 
101 - (void)initializeData
102 {
103     datas = [NSMutableArray arrayWithObjects:@"A",@"B", @"C", @"D", @"E", @"F", @"G", @"H", @"I", @"J", @"K", @"L", @"M", @"N", @"O", @"P", @"Q", @"R", @"S", @"T", @"U", @"V", @"W", @"X", @"Y", @"Z",  nil];
104 }
105 
106 #pragma mark -配置UITableViewDataSource数据
107 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
108 {
109     return [datas count];
110 }
111 
112 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
113 {
114     static NSString *identify = @"cell";
115     UITableViewCell *cell = [_tableView dequeueReusableCellWithIdentifier:identify];
116     if (!cell) {
117         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identify];
118         
119     }
120     cell.textLabel.text = datas[indexPath.row];
121     return cell;
122 }
123 
124 @end