UITableView的移动

#import "RootViewController.h"
#import "RootView.h"
@interface RootViewController ()<UITableViewDataSource,UITableViewDelegate>
@property (nonatomic, strong) RootView *rootView;
// 定义大数组存放所有学生
@property (nonatomic, strong) NSMutableArray *allDataArray;
@end

@implementation RootViewController

- (void)loadView
{
    self.rootView = [[RootView alloc] initWithFrame:[UIScreen mainScreen].bounds];
    self.view = self.rootView;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.rootView.tableView.dataSource = self;// 处理数据源
    
    self.rootView.tableView.delegate = self;// 处理视图
    // 设置数据
    [self handleData];
    // 处理NaviGation
    self.title = @"移动";
    self.navigationController.navigationBar.barTintColor = [UIColor cyanColor];
    self.navigationController.navigationBar.tintColor = [UIColor whiteColor];
// 添加右按钮
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self action:@selector(rightBarButtonItemClick:)];
    
}

// 设置数据
- (void)handleData
{
    //1.初始化大数组
     self.allDataArray = [NSMutableArray array];
    //2. 定义三个数组分别存放三组学生姓名
    NSMutableArray *array1 = @[@"小明", @"小py", @"大肘子", @"张飞", @"根哥"].mutableCopy;
    NSMutableArray *array2 = @[@"高杰", @"宝月", @"周灿", @"傲然"].mutableCopy;
    NSMutableArray *array3 = @[@"刘洋", @"王志婷", @"小强", @"王志准", @"书凯", @"尹浩"].mutableCopy;
    // 添加到大数组中
    [self.allDataArray addObject:array1];
    [self.allDataArray addObject:array2];
    [self.allDataArray addObject:array3];
    
}

// 设置分区个数
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return self.allDataArray.count;
}

// 设置每个分区的行数
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [self.allDataArray[section] count];
}

// 返回cell对象
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *identifier = @"cell";
    // 1.从重用队列查找可用的cell
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
    // 2,判断如果没有可重用的cell,创建cell对象
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:identifier];
        
    }
    // 3. 设置数据
    cell.textLabel.text = [self.allDataArray[indexPath.section] objectAtIndex:indexPath.row];
    
    // 4. 返回cell对象
    return cell;
    
    
}

/**
 *  设置每一行的高度
 */

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 70;
}

#pragma mark UItableView 移动-----
// 实现右按钮方法
- (void)rightBarButtonItemClick:(UIBarButtonItem *)sender
{
    //第一步: 让tableView处于编辑状态
    [self.rootView.tableView setEditing:!self.rootView.tableView.editing animated:YES];
    
}

// 第二步: 设置哪些cell可以移动
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
    return YES;// 所有的cell都能一动
}

// 第三步: 开始移动
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath
{
    
     // 1.获取需要修改的数据
    NSString *sourceName = [self.allDataArray[sourceIndexPath.section] objectAtIndex:sourceIndexPath.row];
    
    // 2. 先将数据从当前位置移除
    [self.allDataArray[sourceIndexPath.section] removeObjectAtIndex:sourceIndexPath.row];
    
    // 3. 将数据插入到对应位置
    [self.allDataArray[destinationIndexPath.section] insertObject:sourceName atIndex:destinationIndexPath.row];
}

#pragma mark 防止随意移动
- (NSIndexPath *)tableView:(UITableView *)tableView targetIndexPathForMoveFromRowAtIndexPath:(NSIndexPath *)sourceIndexPath toProposedIndexPath:(NSIndexPath *)proposedDestinationIndexPath
{
    if (sourceIndexPath.section == proposedDestinationIndexPath.section) {
        return proposedDestinationIndexPath;
    } else {
        return sourceIndexPath;
    }
}