iOS.UIKit.17.UITableView -- Cells Operation

1、案例介绍：表视图中单元格的增加、删除、移动，如图01,02

图01图02

2、.h

#import <UIKit/UIKit.h>

@interface CQ26ViewController : UIViewController<UITableViewDataSource,UITableViewDelegate,UITextFieldDelegate>

@property (weak,nonatomic) IBOutlet UINavigationItem *navgationItem;
@property (weak,nonatomic) IBOutlet UITableView *tableView;
@property (strong,nonatomic) IBOutlet UITextField *txtField;

@property (nonatomic,strong) NSMutableArray *listTeams;

@end

3、.m

#import "CQ26ViewController.h"

@interface CQ26ViewController ()

@end

@implementation CQ26ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    // 1、设置导航栏
    self.navgationItem.rightBarButtonItem = self.editButtonItem;
    self.navgationItem.title = @"单元格插入和删除";
    
    // 2、设置单元格文本框
    self.txtField.hidden = YES;
    self.txtField.delegate = self;
    
    // 3、将当前视图控制器分配给表示图的委托和数据源
    self.tableView.delegate = self;
    self.tableView.dataSource = self;
    
    self.listTeams = [[NSMutableArray alloc] initWithObjects:@"黑龙江",@"吉林",@"辽宁", nil];
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 50;
}

#pragma mark -- UIViewController生命周期方法，用于响应视图编辑状态变化
- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
    [super setEditing:editing animated:animated];
    
    [self.tableView setEditing:editing animated:YES];
    if (editing) {
        self.txtField.hidden = NO;
    } else {
        self.txtField.hidden = YES;
    }
}
#pragma mark UITableViewDataSource协议方法
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [self.listTeams count] + 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    // 1、加载cell
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    // 2、设置cell的内容
    BOOL b_addCell = (indexPath.row == self.listTeams.count);
    if (!b_addCell) {
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
        cell.textLabel.text = [self.listTeams objectAtIndex:indexPath.row];
    }else{
        self.txtField.frame = CGRectMake(10, 0, 300, 44);
        self.txtField.text = @"";
        [cell.contentView addSubview:self.txtField];
    }
    
    return cell;
}
#pragma mark UITableViewDelegate协议方法
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if(indexPath.row == [self.listTeams count]){
        return UITableViewCellEditingStyleInsert;
    }else{
        return UITableViewCellEditingStyleDelete;
    }
}
#pragma mark UITableViewDataSource协议方法
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        [self.listTeams removeObjectAtIndex:indexPath.row];
        [self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
    }else{
        [self.listTeams insertObject:self.txtField.text atIndex:[self.listTeams count]];
        [self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
    }
    [self.tableView reloadData];
}

#pragma mark -- UITextFieldDelegate委托方法,关闭键盘
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    return  YES;
}

#pragma mark -- UITextFieldDelegate委托方法,避免键盘遮挡文本框
- (void) textFieldDidBeginEditing:(UITextField *)textField {
    UITableViewCell *cell = (UITableViewCell*) [[textField superview] superview];
    [self.tableView setContentOffset:CGPointMake(0.0, cell.frame.origin.y) animated:YES];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

4、移动代码

- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath*)indexPath
{
    return YES;
}


- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath*)sourceIndexPath
      toIndexPath:(NSIndexPath *)destinationIndexPath
{
    NSString *stringToMove = [self.listTeams objectAtIndex:sourceIndexPath.row];
    [self.listTeams removeObjectAtIndex:sourceIndexPath.row];
    [self.listTeams insertObject:stringToMove atIndex:destinationIndexPath.row];
}


#pragma mark --UITableViewDelegate 协议方法

- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView
           editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return  UITableViewCellEditingStyleNone;
}


#pragma mark -- UIViewController生命周期方法，用于响应视图编辑状态变化
- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
    
    [super setEditing:editing animated:animated];
    
    [self.tableView setEditing:editing animated:YES];
    
}