数据持久化存储回顾

不是每个程序员都是天才

集合写入文件 

NSDictionary *dic1=@{@"aaa":@"aaa",@"cccc":@"vvvv"};

    NSDictionary *dic2=@{@"ddd":@"ddd"};

    

    NSArray *arr=@[dic1,dic2];

    

    NSString *path=[[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]stringByAppendingPathComponent:@"arr.plist"];

    NSLog(@"%@",path);

    NSLog(@"增加 : %d",[arr writeToFile:path atomically:YES]);

 

集合读取

NSString *path=[[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]stringByAppendingPathComponent:@"data.plist"];

    

    NSData *newData=[NSData dataWithContentsOfFile:path];

    

    NSLog(@"%@",newData);

    

  NSString *newStr=  [[NSString alloc] initWithData:newData encoding:NSUTF8StringEncoding];

    NSLog(@"%@",newStr);

熟练就能很快的敲出来,就是要从低级一步步的来

 

tableView增删改

@interface RootTableViewController ()<PostValueDelegate>

 

{

    //记录选中行的索引值

    NSIndexPath *CurrentIndexPath;

}

 

@end

 

@implementation RootTableViewController

 

- (void)viewDidLoad

{

    [super viewDidLoad];

    self.view.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:@"106.jpg"]];

    //导航栏右按钮

    self.navigationItem.rightBarButtonItem = self.editButtonItem;

    

    self.navigationItem.leftBarButtonItem=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addItem)];

    

    self.Students=[NSMutableArray arrayWithCapacity:3];

    [self.Students addObject:@"zs"];

    [self.Students addObject:@"ls"];

    [self.Students addObject:@"ww"];

    //单元格复用 唯一标识

    [self.tableView registerClass:[UITableViewCell class]forCellReuseIdentifier:@"reuseIdentifier"];

    

    

    

    

}

-(void)addItem

{

    UIAlertController *alertC=[UIAlertController alertControllerWithTitle:@"增加学生信息" message:@"输入姓名" preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction *alertA1=[UIAlertAction actionWithTitle:@"添加" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

       UITextField *textName=alertC.textFields[0];

        //将输入框里的值赋给UITableView里面

        [self.Students addObject:textName.text];

        [self.tableView reloadData];//刷新

        NSLog(@"真正的操作对象");

    }];

    //在提示框添加输入框

    [alertC addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {

        textField.placeholder=@"输入姓名";

    }];

    

    

    [alertC addAction:alertA1];

    [self presentViewController:alertC animated:YES completion:^{

        

    }];

    

}

 

-(void)viewWillAppear:(BOOL)animated

{

    [super viewWillAppear:YES];

    //刷新数据

    [self.tableView reloadData];

}

//5.实现协议方法

-(void)PostValue:(NSString *)UserName

{

    //为集合指定索引位置元素赋值

    self.Students[CurrentIndexPath.row]=UserName;

    //刷新

    [self.tableView reloadData];

}

 

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

 

#pragma mark - Table view data source  多少个分区

 

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

    

    return 1;

}

#pragma mark 每个分区返回多少

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

{

 

    return self.Students.count;

}

 

#pragma

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

{

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"reuseIdentifier" forIndexPath:indexPath];

    

    cell.textLabel.text=self.Students[indexPath.row];

    

    return cell;

}

#pragma 把信息推到下一页

-(void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath

{

    ViewController *vc=[[ViewController alloc] init];

    vc.Name=self.Students[indexPath.row];

    //指定代理

    vc.delegate=self;

    [self.navigationController pushViewController:vc animated:YES];

}

 

//修改

// 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;

}

 

 

//删除某行

// 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.Students removeObjectAtIndex:indexPath.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

    }   

}

 

 

//移动moveRow

// Override to support rearranging the table view.

- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath

{

    //找到指定位置元素

    NSString *name=self.Students[fromIndexPath.row];

    //删除找到的元素

    [self.Students removeObject:name];

    //插入删除集合元素到指定位置

    [self.Students insertObject:name atIndex:toIndexPath.row];

    NSLog(@"%@",self.Students);

    

}

 

 

//让没格可以移动

// 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;

}

 

posted @ 2016-03-21 20:45  火候  阅读(120)  评论(0编辑  收藏  举报