对简单单元格的增删改

#import <UIKit/UIKit.h>

#import "RootTableViewController.h"

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;


@end

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window.rootViewController=[[UINavigationController alloc]initWithRootViewController:[[RootTableViewController alloc]initWithStyle:UITableViewStylePlain]];
    return YES;
}

#import <UIKit/UIKit.h>


@interface RootTableViewController : UITableViewController

@property(strong,nonatomic)  NSMutableArray * array;


@end

#import "RootTableViewController.h"
#import "ViewController.h"
@interface RootTableViewController ()<postValuedelegate>
{
    //记录选中行的索引值
    NSIndexPath * currentInfrxPath;
}
@end

@implementation RootTableViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    //添加liftbarabutton
    
    self.navigationItem.leftBarButtonItem=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addItem)];
    
    self.navigationItem.rightBarButtonItem = self.editButtonItem;
    
    self.array=[NSMutableArray array];
    
    [self.array addObject:@"zhangsan"];
    
    [self.array addObject:@"lisi"];
    
    [self.array addObject:@"wangwu"];
    
    [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"reuseIdentifier"];
    
    
    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;
    
    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    
}

-(void)addItem
{
    UIAlertController *alertcontroller=[UIAlertController alertControllerWithTitle:@"确定要增加吗" message:@"输入姓名？" preferredStyle:(UIAlertControllerStyleAlert)];
    UIAlertAction * ok=[UIAlertAction actionWithTitle:@"增加" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        UITextField * textName= alertcontroller.textFields[0];
        
        
        [self.array addObject:textName.text];
        
        [self.tableView reloadData];
        
//        NSLog(@"真正的操作");
    }];
    
    [alertcontroller addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
       
        textField.placeholder=@"添加姓名";
    }];
    
    [alertcontroller addAction:ok];
    
    [self presentViewController:alertcontroller animated:YES completion:nil];
    
}

-(void)postvalue:(NSString *)username
{
    //为集合指定索引位置元素赋值
    self.array[currentInfrxPath.row]=username;
    NSLog(@"%@",username);
    //刷新数据
    [self.tableView reloadData];
}

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

#pragma mark - Table view data source

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

    return 1;
}

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

    return self.array.count;
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"reuseIdentifier" forIndexPath:indexPath];
    
    cell.textLabel.text=self.array[indexPath.row];
    
    return cell;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    
    currentInfrxPath=indexPath;
    ViewController *vc=[[ViewController alloc]init];
    
    vc.name=self.array[indexPath.row];
    vc.delegate=self;
    [self.navigationController pushViewController:vc animated:YES];
}


// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
    // Return NO if you do not want the specified item to be editable.
    return YES;
}



// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Delete the row from the data source
        
        [self.array removeObjectAtIndex:currentInfrxPath.row];
        [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
    } else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }   
}



// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
    //1.找到指定位置集合元素
    NSString * name= self.array[fromIndexPath.row];
    //2.删除集合元素
    [self.array removeObject:name];
    //3插入集合
    [self.array  insertObject:name atIndex:toIndexPath.row];
    
    NSLog(@"%@",self.array);
    
}



// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
    // Return NO if you do not want the item to be re-orderable.
    return YES;
}


/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

#import <UIKit/UIKit.h>

@protocol postValuedelegate <NSObject>

-(void)postvalue:(NSString *) username;

@end

@interface ViewController : UIViewController<UITextFieldDelegate>

@property(strong,nonatomic) NSString *name;

@property(strong,nonatomic) UITextField * textNmae;

@property(strong,nonatomic) id<postValuedelegate> delegate;

@end

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor=[UIColor greenColor];
    self.textNmae=[[UITextField alloc]initWithFrame:CGRectMake(100, 100, 150, 44)];
    
    self.textNmae.delegate=self;
    
    self.textNmae.borderStyle=1;
    
    self.textNmae.text=self.name;
    
    [self.view addSubview:self.textNmae];
}


-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
    
    if (self.delegate) {
        [self.delegate postvalue:textField.text];
    }
    if ([textField isFirstResponder]) {
        [textField resignFirstResponder];
    }
    
    [self.navigationController popViewControllerAnimated:YES];
    
    return YES;
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end