iOS开发UI篇—在UItableview中实现加载更多功能

 1 //  Created by 鑫 on 14-10-8.
 2 //  Copyright (c) 2014年 梁镋鑫. All rights reserved.
 3 //
 4 
 5 #import <Foundation/Foundation.h>
 6 
 7 @interface TXTg : NSObject
 8 /**
 9  *  标题
10  */
11 @property(nonatomic,copy)NSString *title;
12 /**
13  *  价格
14  */
15 @property(nonatomic,copy)NSString *price;
16 /**
17  *  图片
18  */
19 @property(nonatomic,copy)NSString *icon;
20 /**
21  *  购买人数
22  */
23 @property(nonatomic,copy)NSString *buyCount;
24 -(instancetype)initWithDict:(NSDictionary *)dict;
25 +(instancetype)tgWithDict:(NSDictionary *)dict;
26 @end

 1 #import "TXTg.h"
 2 
 3 @implementation TXTg
 4 -(instancetype)initWithDict:(NSDictionary *)dict;
 5 {
 6     if (self = [super init]) {
 7         [self setValuesForKeysWithDictionary:dict];
 8     }
 9     return self;
10 }
11 +(instancetype)tgWithDict:(NSDictionary *)dict
12 {
13     return [[self alloc]initWithDict:dict];
14     
15 }
16 @end

 1 //  屌丝逆天记-团购-01
 2 //
 3 //  Created by 鑫 on 14-10-8.
 4 //  Copyright (c) 2014年 梁镋鑫. All rights reserved.
 5 //
 6 
 7 #import <UIKit/UIKit.h>
 8 @class TXTg;
 9 @interface TXTgCell : UITableViewCell
10 /**
11  *  通过一个tableview来创建一个cell
12  */
13 +(instancetype)cellWithTableView:(UITableView *)tableView;
14 /**
15  *  团购模型
16  */
17 @property(nonatomic ,strong)TXTg *tg;
18 
19 @end

 1 #import "TXTgCell.h"
 2 #import "TXTg.h"
 3 @interface TXTgCell()
 4 @property (weak, nonatomic) IBOutlet UIImageView *iconView;
 5 @property (weak, nonatomic) IBOutlet UILabel *titleView;
 6 @property (weak, nonatomic) IBOutlet UILabel *priceView;
 7 @property (weak, nonatomic) IBOutlet UILabel *buyCountView;
 8 
 9 @end
10 @implementation TXTgCell
11 +(instancetype)cellWithTableView:(UITableView *)tableView
12 {
13     static NSString *ID =@"tg";
14     TXTgCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
15     if (cell ==nil) {
16         //从xib中加载cell
17         cell = [[[NSBundle mainBundle] loadNibNamed:@"TXTgCell" owner:nil options:nil] lastObject];
18     }
19     return cell;
20 }
21 -(void)setTg:(TXTg *)tg
22 {
23     _tg = tg;
24     
25     //图片
26     self.iconView.image = [UIImage imageNamed:tg.icon];
27     self.titleView.text = tg.title;
28     self.priceView.text = [NSString stringWithFormat:@"￥%@",tg.price];
29     
30     self.buyCountView.text = [NSString stringWithFormat:@"%@人已购买", tg.buyCount];
31 }
32 
33 
34 
35 @end

 1 #import <UIKit/UIKit.h>
 2 @class TXViewController;
 3 @interface TXTgFooterView : UIView
 4 /**
 5  *  快速创建一个footerView对象
 6  
 7  */
 8 +(instancetype )footerView;
 9 @property(nonatomic ,strong)TXViewController *controller;
10 
11 @end

 1 #import "TXTgFooterView.h"
 2 #import "TXViewController.h"
 3 @interface TXTgFooterView()
 4 @property (weak, nonatomic) IBOutlet UIButton *loadBtn;
 5 @property (weak, nonatomic) IBOutlet UIView *loadingView;
 6 
 7 @end
 8 @implementation TXTgFooterView
 9 +(instancetype)footerView
10 {
11      return [[[NSBundle mainBundle] loadNibNamed:@"TXTgFooterView" owner:nil options:nil] lastObject];
12 }
13 - (IBAction)loadBtnClick {
14     //隐藏加载按钮
15     self.loadBtn.hidden = YES;
16     //显示正在加载
17     self.loadingView.hidden = NO;
18     
19     //显示更多按钮
20     //GCD延迟加载
21     
22     dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{// 3.0s后执行block里面的代码
23         
24         [self.controller loadingMoreData];
25         
26         // 4.显示加载按钮
27         self.loadBtn.hidden = NO;
28         
29         // 5.隐藏"正在加载"
30         self.loadingView.hidden = YES;
31         
32     });
33     
34     
35     
36 }
37 
38 
39 @end

1 #import <UIKit/UIKit.h>
2 
3 @interface TXViewController : UIViewController
4 - (void)loadingMoreData;
5 @end

  1 #import "TXViewController.h"
  2 #import "TXTg.h"
  3 #import "TXTgCell.h"
  4 #import "TXTgFooterView.h"
  5 @interface TXViewController ()<UITableViewDataSource>
  6 @property (weak, nonatomic) IBOutlet UITableView *tableview;
  7 
  8 @property(nonatomic ,strong)NSMutableArray *tgs;
  9 
 10 @end
 11 
 12 @implementation TXViewController
 13 
 14 - (void)viewDidLoad
 15 {
 16     [super viewDidLoad];
 17     //设置每一行cell的高度
 18     self.tableview.rowHeight =80;
 19     
 20     //设置footerView
 21     TXTgFooterView * footer = [TXTgFooterView footerView];
 22     footer.controller = self;
 23     self.tableview.tableFooterView = footer;
 24   
 25 }
 26 /**
 27  *  隐藏状态栏
 28  */
 29 - (BOOL)prefersStatusBarHidden
 30 {
 31     return YES;
 32 }
 33 /**
 34  *  数据的懒加载
 35  */
 36 -(NSMutableArray *)tgs
 37 {
 38     if (_tgs ==nil) {
 39         //初始化
 40         NSString *path = [[NSBundle mainBundle]pathForResource:@"tgs.plist" ofType:nil];
 41         //加载数组
 42         
 43         NSArray *dictArray = [NSArray arrayWithContentsOfFile:path];
 44         
 45         //3.将dictArray里面的所有字典转成模型对象，放到新的数组中
 46         NSMutableArray *tgArray = [NSMutableArray array];
 47         
 48         for (NSDictionary *dict in dictArray) {
 49             //创建模型对象
 50             TXTg *tg = [TXTg tgWithDict:dict];
 51             
 52             // 加载模型对象倒数组中
 53             [tgArray addObject:tg];
 54             
 55         }
 56         _tgs = tgArray;
 57         
 58     }
 59     return _tgs;
 60 }
 61 /**
 62  *  加载更多的数据
 63  */
 64 -(void)loadingMoreData
 65 {
 66     //添加更多模型数据
 67     TXTg *tg = [[TXTg alloc]init];
 68     tg.icon =@"ad_01";
 69     tg.title = @"jsfsdfjjsd";
 70     tg.price = @"100";
 71     tg.buyCount = @"0";
 72     [self.tgs addObject:tg];
 73     // 2.刷新表格(告诉tableView重新加载模型数据, 调用tableView的reloadData)
 74     [self.tableview reloadData];
 75     
 76 }
 77 
 78 #pragma mark --数据源方法
 79 /**
 80  *  一共多少行
 81  */
 82 -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 83 {
 84     return self.tgs.count;
 85 }
 86 /**
 87  *  每一行显示怎样的cell
 88  */
 89 -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 90 {
 91     //创建cell
 92     TXTgCell *cell = [TXTgCell cellWithTableView:tableView];
 93     
 94     //给cell传递模型数据
 95     cell.tg  = self.tgs[indexPath.row];
 96     return cell;
 97 }
 98 - (void)didReceiveMemoryWarning
 99 {
100     [super didReceiveMemoryWarning];
101     // Dispose of any resources that can be recreated.
102 }
103 
104 @end

 1 #import <UIKit/UIKit.h>
 2 @class TXTgFooterView;
 3 /**
 4  1.协议名称:  控件类名 + Delegate
 5  2.代理方法普遍都是@optional
 6  3.
 7  */
 8 @protocol TXTfFooterViewDelegate <NSObject>
 9 
10 @optional
11 -(void)tgFooterViewDidClickedLoadBtn:(TXTgFooterView *)tgFooterView;
12 
13 @end
14 
15 
16 @interface TXTgFooterView : UIView
17 
18 /**
19  *  快速创建一个footerView对象
20  */
21 + (instancetype)footerView;
22 
23 //定义一个代理，这个代理必须实现<TXTgFooterViewDelegate>这个协议
24 @property(nonatomic,weak) id <TXTfFooterViewDelegate> delegate;
25 
26 
27 @end

 1 #import "TXTgFooterView.h"
 2 #import "TXViewController.h"
 3 
 4 @interface TXTgFooterView()
 5 - (IBAction)loadBtnClick;
 6 @property (weak, nonatomic) IBOutlet UIButton *loadBtn;
 7 @property (weak, nonatomic) IBOutlet UIView *loadingView;
 8 @end
 9 
10 @implementation TXTgFooterView
11 
12 + (instancetype)footerView
13 {
14     return [[[NSBundle mainBundle] loadNibNamed:@"TXTgFooterView" owner:nil options:nil] lastObject];
15 }
16 
17 /**
18  *  点击"加载"按钮
19  */
20 - (IBAction)loadBtnClick {
21     // 1.隐藏加载按钮
22     self.loadBtn.hidden = YES;
23     
24     // 2.显示"正在加载"
25     self.loadingView.hidden = NO;
26     
27     // 3.显示更多的数据
28     // GCD
29     dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ // 3.0s后执行block里面的代码
30         if ([self.delegate respondsToSelector:@selector(tgFooterViewDidClickedLoadBtn:)]) {
31             [self.delegate tgFooterViewDidClickedLoadBtn:self];
32         }
33         // 4.显示加载按钮
34         self.loadBtn.hidden = NO;
35         
36         // 5.隐藏"正在加载"
37         self.loadingView.hidden = YES;
38     });
39 }
40 @end

1 #import <UIKit/UIKit.h>
2 
3 @interface TXViewController : UIViewController
4 - (void)loadingMoreData;
5 @end

  1 #import "TXViewController.h"
  2 #import "TXTg.h"
  3 #import "TXTgCell.h"
  4 #import "TXTgFooterView.h"
  5 #import "TXTXTgHeaderView.h"
  6 @interface TXViewController () <UITableViewDataSource,TXTfFooterViewDelegate>
  7 @property (weak, nonatomic) IBOutlet UITableView *tableView;
  8 @property (nonatomic, strong) NSMutableArray *tgs;
  9 @end
 10 
 11 @implementation TXViewController
 12 
 13 - (void)viewDidLoad
 14 {
 15     [super viewDidLoad];
 16     
 17     // 设置每一行cell的高度
 18     self.tableView.rowHeight = 80;
 19   
 20     // 设置footerView
 21     TXTgFooterView *footer = [TXTgFooterView footerView];
 22     footer.delegate =self;
 23     self.tableView.tableFooterView = footer;
 24     
 25     
 26     //设置headerView
 27     self.tableView.tableHeaderView = [TXTXTgHeaderView headerView];
 28     
 29     // 设置tableView尾部显示的控件(tableFooterView的宽度永远是tableView的宽度)
 30     // tableFooterView只需要设置高度
 31 //    UIButton *footerBtn = [UIButton buttonWithType:UIButtonTypeSystem];
 32 //    footerBtn.frame = CGRectMake(0, 0, 0, 35);
 33 //    footerBtn.backgroundColor = [UIColor orangeColor];
 34 //    [footerBtn setTitle:@"加载更多团购" forState:UIControlStateNormal];
 35     
 36 //    UINib *nib = [UINib nibWithNibName:@"TXTgFooterView" bundle:[NSBundle mainBundle]];
 37     
 38     // 创建nib对象
 39 //    UINib *nib = [UINib nibWithNibName:@"TXTgFooterView" bundle:nil];
 40 //    
 41 //    // 加载xib\nib
 42 //    UIView *footerView = [[nib instantiateWithOwner:nil options:nil] lastObject];
 43 //    self.tableView.tableFooterView = footerView;
 44 }
 45 
 46 /**
 47  *  加载更多的数据
 48  */
 49 - (void)tgFooterViewDidClickedLoadBtn:(TXTgFooterView *)tgFooterView
 50 {
 51      #warning 正常开发:发送网络请求给远程的服务器
 52     // 1.添加更多的模型数据
 53     TXTg *tg = [[TXTg alloc] init];
 54     tg.icon = @"ad_01";
 55     tg.title = @"新增加的团购数据..";
 56     tg.price = @"100";
 57     tg.buyCount = @"0";
 58     [self.tgs addObject:tg];
 59     
 60     // 2.刷新表格(告诉tableView重新加载模型数据, 调用tableView的reloadData)
 61     [self.tableView reloadData];
 62 }
 63 
 64 /**
 65  *  隐藏状态栏
 66  */
 67 - (BOOL)prefersStatusBarHidden
 68 {
 69     return YES;
 70 }
 71 
 72 /**
 73  *  数据的懒加载
 74  */
 75 - (NSMutableArray *)tgs
 76 {
 77     if (_tgs == nil) {
 78         // 初始化
 79         // 1.获得plist的全路径
 80         NSString *path = [[NSBundle mainBundle] pathForResource:@"tgs.plist" ofType:nil];
 81         
 82         // 2.加载数组
 83         NSArray *dictArray = [NSArray arrayWithContentsOfFile:path];
 84         
 85         // 3.将dictArray里面的所有字典转成模型对象,放到新的数组中
 86         NSMutableArray *tgArray = [NSMutableArray array];
 87         for (NSDictionary *dict in dictArray) {
 88             // 3.1.创建模型对象
 89             TXTg *tg = [TXTg tgWithDict:dict];
 90             
 91             // 3.2.添加模型对象到数组中
 92             [tgArray addObject:tg];
 93         }
 94         
 95         // 4.赋值
 96         _tgs = tgArray;
 97     }
 98     return _tgs;
 99 }
100 
101 #pragma mark - 数据源方法
102 /**
103  *  一共有多少行数据
104  */
105 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
106 {
107     return self.tgs.count;
108 }
109 
110 /**
111  *  每一行显示怎样的cell
112  */
113 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
114 {
115     // 1.创建cell
116     TXTgCell *cell = [TXTgCell cellWithTableView:tableView];
117     
118     // 2.给cell传递模型数据
119     cell.tg = self.tgs[indexPath.row];
120     return cell;
121 }
122 @end