118删除单元格（扩展知识：添加单元格和移动单元格的位置）

效果如下：

ViewController.h

1 #import <UIKit/UIKit.h>

2 

3 @interface ViewController : UITableViewController

4 @property (strong, nonatomic) NSMutableArray *mArrDataSource;

5 

6 @end

ViewController.m

  1 #import "ViewController.h"

  2 

  3 @interface ViewController ()

  4 - (void)layoutUI;

  5 @end

  6 

  7 @implementation ViewController

  8 

  9 - (void)viewDidLoad {

 10     [super viewDidLoad];

 11     

 12     [self layoutUI];

 13 }

 14 

 15 - (void)didReceiveMemoryWarning {

 16     [super didReceiveMemoryWarning];

 17     // Dispose of any resources that can be recreated.

 18 }

 19 

 20 - (void)viewDidAppear:(BOOL)animated {

 21     [super viewDidAppear:animated];

 22     

 23     //设置表格是否处于编辑模式；默认为NO

 24     [self.tableView setEditing:YES animated:YES];

 25 }

 26 

 27 - (void)layoutUI {

 28     _mArrDataSource = [[NSMutableArray alloc] initWithArray:

 29                        @[@"A", @"B", @"C", @"D", @"E", @"F", @"G",

 30                          @"H", @"I", @"J", @"K", @"L", @"M", @"N",

 31                          @"O", @"P", @"Q", @"R", @"S", @"T", @"U",

 32                          @"V", @"W", @"X", @"Y", @"Z", @"添加单元格"]];

 33     

 34     self.navigationItem.prompt = @"TableView里面，单元格也被称为Row";

 35     self.navigationItem.title = @"单元格操作（删除、添加、移动）";

 36 }

 37 

 38 #pragma mark - TableView

 39 - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {

 40     return @"数据列表";

 41 }

 42 

 43 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

 44     return 1;

 45 }

 46 

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

 48     return [_mArrDataSource count];

 49 }

 50 

 51 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

 52     static NSString *cellIdentifier = @"cellIdentifier";

 53     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];

 54     if (!cell) {

 55         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];

 56     }

 57     cell.textLabel.text = _mArrDataSource[indexPath.row];

 58     return cell;

 59 }

 60 

 61 #pragma mark - TableView, insert or delete row

 62 - (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath {

 63     //编辑模式下，设置最后的Row为插入模式

 64     UITableViewCellEditingStyle style = tableView.editing && indexPath.row == (_mArrDataSource.count - 1) ? UITableViewCellEditingStyleInsert : UITableViewCellEditingStyleDelete;

 65     return style;

 66 }

 67 

 68 - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {

 69     switch (editingStyle) {

 70         case UITableViewCellEditingStyleNone: {

 71             break;

 72         }

 73         case UITableViewCellEditingStyleDelete: {

 74             //删除数据源数据

 75             [_mArrDataSource removeObjectAtIndex:indexPath.row];

 76             //删除单元格；注意必须保证操作之前已删除对应的数据源数据，否则报错

 77             [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]

 78                              withRowAnimation:UITableViewRowAnimationAutomatic];

 79             break;

 80         }

 81         case UITableViewCellEditingStyleInsert: {

 82             //添加数据源数据

 83             [_mArrDataSource insertObject:@"我是添加的单元格" atIndex:(_mArrDataSource.count - 1)];

 84             //添加单元格；注意必须保证操作之前已添加对应的数据源数据，否则报错

 85             [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]

 86                              withRowAnimation:UITableViewRowAnimationAutomatic];

 87             break;

 88         }

 89     }

 90 }

 91 

 92 #pragma mark - TableView, move row

 93 - (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {

 94     //设置最后的Row不可移动

 95     return indexPath.row < (_mArrDataSource.count - 1);

 96 }

 97 

 98 - (NSIndexPath *)tableView:(UITableView *)tableView targetIndexPathForMoveFromRowAtIndexPath:(NSIndexPath *)sourceIndexPath toProposedIndexPath:(NSIndexPath *)proposedDestinationIndexPath {

 99     //限制单元格移动到最后的Row下方

100     NSIndexPath *indexPath = proposedDestinationIndexPath.row < (_mArrDataSource.count - 1) ? proposedDestinationIndexPath : sourceIndexPath;

101     return indexPath;

102 }

103 

104 - (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath {

105     NSUInteger sourceRow = sourceIndexPath.row;

106     NSUInteger destinationRow = destinationIndexPath.row;

107     //单元格向下移动时；循环进行当前数据与下一位数据交换位置

108     while (sourceRow < destinationRow) {

109         [_mArrDataSource exchangeObjectAtIndex:sourceRow withObjectAtIndex:(sourceRow + 1)];

110         sourceRow++;

111     }

112     //单元格向上移动时；循环进行当前数据与上一位数据交换位置

113     while (sourceRow > destinationRow) {

114         [_mArrDataSource exchangeObjectAtIndex:sourceRow withObjectAtIndex:(sourceRow - 1)];

115         sourceRow--;

116     }

117 }

118 

119 @end

AppDelegate.h

1 #import <UIKit/UIKit.h>

2 

3 @interface AppDelegate : UIResponder <UIApplicationDelegate>

4 @property (strong, nonatomic) UIWindow *window;

5 @property (strong, nonatomic) UINavigationController *navigationController;

6 

7 @end

AppDelegate.m

 1 #import "AppDelegate.h"

 2 #import "ViewController.h"

 3 

 4 @interface AppDelegate ()

 5 @end

 6 

 7 @implementation AppDelegate

 8 

 9 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

10     _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

11     ViewController *viewController = [[ViewController alloc] init];

12     _navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];

13     _window.rootViewController = _navigationController;

14     //[_window addSubview:_navigationController.view]; //当_window.rootViewController关联时，这一句可有可无

15     [_window makeKeyAndVisible];

16     return YES;

17 }

18 

19 - (void)applicationWillResignActive:(UIApplication *)application {

20 }

21 

22 - (void)applicationDidEnterBackground:(UIApplication *)application {

23 }

24 

25 - (void)applicationWillEnterForeground:(UIApplication *)application {

26 }

27 

28 - (void)applicationDidBecomeActive:(UIApplication *)application {

29 }

30 

31 - (void)applicationWillTerminate:(UIApplication *)application {

32 }

33 

34 @end