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

#import <UIKit/UIKit.h>

@interface ViewController : UITableViewController
@property (strong, nonatomic) NSMutableArray *mArrDataSource;

@end

ViewController.m

#import "ViewController.h"

@interface ViewController ()
- (void)layoutUI;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self layoutUI];
}

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

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    
    //设置表格是否处于编辑模式；默认为NO
    [self.tableView setEditing:YES animated:YES];
}

- (void)layoutUI {
    _mArrDataSource = [[NSMutableArray alloc] initWithArray:
                       @[@"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", @"添加单元格"]];
    
    self.navigationItem.prompt = @"TableView里面，单元格也被称为Row";
    self.navigationItem.title = @"单元格操作（删除、添加、移动）";
}

#pragma mark - TableView
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
    return @"数据列表";
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return [_mArrDataSource count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *cellIdentifier = @"cellIdentifier";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    }
    cell.textLabel.text = _mArrDataSource[indexPath.row];
    return cell;
}

#pragma mark - TableView, insert or delete row
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath {
    //编辑模式下，设置最后的Row为插入模式
    UITableViewCellEditingStyle style = tableView.editing && indexPath.row == (_mArrDataSource.count - 1) ? UITableViewCellEditingStyleInsert : UITableViewCellEditingStyleDelete;
    return style;
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    switch (editingStyle) {
        case UITableViewCellEditingStyleNone: {
            break;
        }
        case UITableViewCellEditingStyleDelete: {
            //删除数据源数据
            [_mArrDataSource removeObjectAtIndex:indexPath.row];
            //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
            [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
                             withRowAnimation:UITableViewRowAnimationAutomatic];
            break;
        }
        case UITableViewCellEditingStyleInsert: {
            //添加数据源数据
            [_mArrDataSource insertObject:@"我是添加的单元格" atIndex:(_mArrDataSource.count - 1)];
            //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
            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
                             withRowAnimation:UITableViewRowAnimationAutomatic];
            break;
        }
    }
}

#pragma mark - TableView, move row
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
    //设置最后的Row不可移动
    return indexPath.row < (_mArrDataSource.count - 1);
}

- (NSIndexPath *)tableView:(UITableView *)tableView targetIndexPathForMoveFromRowAtIndexPath:(NSIndexPath *)sourceIndexPath toProposedIndexPath:(NSIndexPath *)proposedDestinationIndexPath {
    //限制单元格移动到最后的Row下方
    NSIndexPath *indexPath = proposedDestinationIndexPath.row < (_mArrDataSource.count - 1) ? proposedDestinationIndexPath : sourceIndexPath;
    return indexPath;
}

- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath {
    NSUInteger sourceRow = sourceIndexPath.row;
    NSUInteger destinationRow = destinationIndexPath.row;
    //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
    while (sourceRow < destinationRow) {
        [_mArrDataSource exchangeObjectAtIndex:sourceRow withObjectAtIndex:(sourceRow + 1)];
        sourceRow++;
    }
    //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
    while (sourceRow > destinationRow) {
        [_mArrDataSource exchangeObjectAtIndex:sourceRow withObjectAtIndex:(sourceRow - 1)];
        sourceRow--;
    }
}

@end

AppDelegate.h

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) UINavigationController *navigationController;

@end

AppDelegate.m

#import "AppDelegate.h"
#import "ViewController.h"

@interface AppDelegate ()
@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    ViewController *viewController = [[ViewController alloc] init];
    _navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
    _window.rootViewController = _navigationController;
    //[_window addSubview:_navigationController.view]; //当_window.rootViewController关联时，这一句可有可无
    [_window makeKeyAndVisible];
    return YES;
}

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

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

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

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

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

@end