Xcode8后CoreData的使用

E9322D5A-7317-4297-B55F-007B4D452E61.png

一、创建xxx.xcdatamodeld的可视化模型文件 eg:MyCoreData.xcdatamodeld
并且添加两个属性 name age

直接上代码：

import "ViewController.h"

import "AppDelegate.h"

import "FirstCoreData+CoreDataClass.h"

@interface ViewController ()
/****** table ******/
@property (strong, nonatomic) UITableView *myTable;
/****** dataSourse ******/
@property (strong, nonatomic) NSMutableArray *dataSourse;

/****** appdelegate ******/
@property (strong, nonatomic) AppDelegate *myAppdelegate;
@end

@implementation ViewController

pragma mark - lazy

• (UITableView *)myTable{
  if (!_myTable) {
  _myTable = [[UITableView alloc]initWithFrame:self.view.bounds style:UITableViewStylePlain];
  _myTable.delegate = self;
  _myTable.dataSource = self;
  _myTable.rowHeight = 50;
  }
  return _myTable;
  }
• (NSMutableArray *)dataSourse{
  if (!_dataSourse) {
  _dataSourse = [NSMutableArray array];
  }
  return _dataSourse;
  }

pragma mark - 系统

• (void)viewWillAppear:(BOOL)animated{
  [super viewWillAppear:animated];
  //查询数据
  //创建NSFetchRequest对象
  NSFetchRequest *fetchRequest= [[NSFetchRequest alloc]initWithEntityName:@"FirstCoreData"];
  //排序
  NSSortDescriptor *sort = [[NSSortDescriptor alloc]initWithKey:@"age" ascending:YES];
  fetchRequest.sortDescriptors = @[sort]; //这可以添加多种排序
  NSError *error = nil;
  NSArray *tempArray = [self.myAppdelegate.persistentContainer.viewContext executeFetchRequest:fetchRequest error:&error];

  if (error) {
  NSLog(@"查询失败：%@",error);
  }else{

    [self.dataSourse addObjectsFromArray:tempArray];  //添加到数据
  

  }

}

• (void)viewDidLoad {
  [super viewDidLoad];
  self.view.backgroundColor = [UIColor whiteColor];
  self.title = @"coreDataTest";
  UIBarButtonItem *right = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addData)];
  self.navigationItem.rightBarButtonItem = right;

  UIBarButtonItem *left = [[UIBarButtonItem alloc]initWithTitle:@"长按修改" style:UIBarButtonItemStylePlain target:self action:@selector(change)];
  self.navigationItem.leftBarButtonItem = left;

  [self.view addSubview:self.myTable];
  self.myAppdelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;

}

pragma mark - addData

• (void)change{

}

• (void)addData{
  //添加数据
  NSEntityDescription *description = [NSEntityDescription entityForName:@"FirstCoreData" inManagedObjectContext:self.myAppdelegate.persistentContainer.viewContext];
  FirstCoreData *first = [[FirstCoreData alloc]initWithEntity:description insertIntoManagedObjectContext:self.myAppdelegate.persistentContainer.viewContext];
  first.name = @"ZhangSan";
  int age = arc4random() % 30 + 1;
  first.age = [NSString stringWithFormat:@"%d",age];
  [self.dataSourse addObject:first]; //添加数据源
  [self.myTable insertRowsAtIndexPaths:@[[NSIndexPath indexPathForRow:self.dataSourse.count - 1 inSection:0]] withRowAnimation:UITableViewRowAnimationLeft]; //table插入数据
  [self.myAppdelegate saveContext]; //保存数据

}

pragma mark - table delegate datasourse

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

• (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
  return self.dataSourse.count;
  }

• (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
  NSString *cellID = [NSString stringWithFormat:@"%ld%ld",(long)indexPath.section,(long)indexPath.row];
  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];
  if (!cell) {
  cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID];
  }
  //获取数据
  FirstCoreData *first = self.dataSourse[indexPath.row];
  cell.textLabel.text = [NSString stringWithFormat:@"name:%@ age:%@",first.name, first.age];
  // 添加长按手势操作
  UILongPressGestureRecognizer * longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(cellLongPress:)];
  [cell addGestureRecognizer:longPressGesture];

  return cell;
  }
  //删除

• (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{
  if (editingStyle == UITableViewCellEditingStyleDelete) {
  //1.获取数据源
  FirstCoreData *first = self.dataSourse[indexPath.row];
  //2.删除数据数据源
  [self.dataSourse removeObject:first];
  //3.删除单元格
  [self.myTable deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
  //4.删除数据管理器中的数据
  [self.myAppdelegate.persistentContainer.viewContext deleteObject:first];
  //5.保存
  [self.myAppdelegate saveContext];

  }
  }

• (NSString *)tableView:(UITableView *)tableView titleForDeleteConfirmationButtonForRowAtIndexPath:(NSIndexPath *)indexPath{
  return @"删除";
  }
  // 长按修改

• (void)cellLongPress:(UILongPressGestureRecognizer *)tap{

  CGPoint index = [tap locationInView:self.myTable];
  NSIndexPath *indexPath = [self.myTable indexPathForRowAtPoint:index]; //获取行数
  UITableViewCell *cell = (UITableViewCell *)tap.view; //强转cell

  FirstCoreData *first = self.dataSourse[indexPath.row];
  first.name = @"修改后的闪闪发光";
  cell.textLabel.textColor = [UIColor orangeColor];
  [self.myTable reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];

  //保存数据
  [self.myAppdelegate saveContext];

}

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