viewController .m 内部的写法：
1 首先在新建的时候需要勾选 Use Core Data 选项
2 需要创建 coreData 数据
#import "ViewController.h"
#import "AppDelegate.h"
#import "Student+CoreDataProperties.h"
@interface ViewController ()<UITableViewDataSource, UITableViewDelegate>//接受tableView的代理
@property (weak, nonatomic) IBOutlet UITableView *tableView;
@property (nonatomic, strong) NSMutableArray *dataArray;
//声明对像属性，调用类中的属性，如：被管理对象
@property (nonatomic, strong) AppDelegate *myAppDelegate;
@end
@implementation ViewController
//导航控制器的 添加按钮
- (IBAction)addModle:(UIBarButtonItem *)sender {
//插入数据
NSEntityDescription *description = [NSEntityDescription entityForName:@"Student" inManagedObjectContext:self.myAppDelegate.managedObjectContext];
//首先创建模型
Student *student = [[Student alloc] initWithEntity:description insertIntoManagedObjectContext:self.myAppDelegate.managedObjectContext];
NSArray *array1 = @[@"李小龙",@"梅艳芳",@"乔布斯",@"林志玲",@"乔丹"];
NSArray *array2 = @[@"男",@"女"];
int age = arc4random()%(40 - 10 + 1) + 10;
int x = arc4random() % 2;
int y = arc4random() % 5;
student.age = [NSNumber numberWithInt:age];
student.name = [array1 objectAtIndex:y];
student.gender = [array2 objectAtIndex:x];
//把数据模型添加到数组
[self.dataArray addObject:student];
//添加到 tableView 表视图
[self.tableView insertRowsAtIndexPaths:@[[NSIndexPath indexPathForRow:self.dataArray.count - 1 inSection:0]] withRowAnimation:UITableViewRowAnimationFade];//
//对数据管理器中的更改进行永久存储
[self.myAppDelegate saveContext];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return self.dataArray.count;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
//在可视化变成内部已经 设置好 标签 “cell”
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];
//找到模型
Student *student = self.dataArray[indexPath.row];
cell.textLabel.text = [NSString stringWithFormat:@"%@-%@-%@",student.name,student.gender,student.age];
return cell;
}
//允许编辑
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath{
return YES;
}
//编辑执行的方法
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{
if (editingStyle == UITableViewCellEditingStyleDelete) {
//删除数据源
Student *stu = self.dataArray[indexPath.row];
[self.dataArray removeObject:stu];
//删除数据管理器的数据
[self.myAppDelegate.managedObjectContext deleteObject:stu];
//将进行更改的数据 进行永久保存
[self.myAppDelegate saveContext];
//删除段元格
[self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
}
//点击cell的方法
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
NSLog(@"section：%ld,row：%ld",indexPath.section, indexPath.row);
}
- (void)viewDidLoad {
[super viewDidLoad];
//设置导航控制器的标题
self.navigationItem.title = @"超级明星";
//初始化存放数据的数组
self.dataArray = [NSMutableArray arrayWithCapacity:0];
//初始化代理
self.myAppDelegate = [UIApplication sharedApplication].delegate;
//查询数据
// 1 NSFetchRequst对象
NSFetchRequest *request = [[NSFetchRequest alloc] initWithEntityName:@"Student"];
//2 设置排序
//2.1 创建排序描述对象
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"age" ascending:YES];//是否升序 给yes
//返回值是数组
request.sortDescriptors = @[sortDescriptor];
//执行查询请求
NSError *error = nil;
NSArray *result = [self.myAppDelegate.managedObjectContext executeFetchRequest:request error:&error];
//给数据源数组添加数据
[self.dataArray addObjectsFromArray:result];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end