coredata
#import "DataManager.h"
#import "AppDelegate.h"
@interfaceDataManager(){
//声明一个AppDelegate对象属性,调用里面的被管理的对象上下文 保存方法
AppDelegate * myDelegate;
}
@end
@implementation DataManager
//单例创建
+(DataManager *)shareManager{
staticDataManager * manager;
if(!manager) {
manager = [[DataManager alloc]init];
}
returnmanager;
}
//插入
-(void)insert:(NSDictionary *)dic{
//CoreData数据的插入
//新方法 **
myDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
//创建实体描述对象
NSEntityDescription * descrption = [NSEntityDescription entityForName:@"Student"inManagedObjectContext:myDelegate.persistentContainer.viewContext];
//创建一个模型对
Student * student = [[Student alloc] initWithEntity:descrption insertIntoManagedObjectContext:myDelegate.persistentContainer.viewContext];
student.name = dic[@"name"];
student.age = [dic[@"age"]integerValue];
student.sex = [dic[@"sex"]integerValue];
//对数据管理器的更改进行永久保存
[myDelegate saveContext];
}
//更改
-(void)updata:(Student *)student{
myDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
[myDelegate saveContext];
}
//查找
-(NSArray *)select{
myDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
//查询数据
//1.创建查询请求
NSFetchRequest * request = [[NSFetchRequest alloc]initWithEntityName:@"Student"];
//获取地址
NSError * error =nil;
//2.执行这个查询请求
NSArray * result = [myDelegate.persistentContainer.viewContext executeFetchRequest:request error:&error];
returnresult;
}
//删除
-(void)deleteData:(Student *)student{
myDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
[myDelegate.persistentContainer.viewContext deleteObject:student];
[myDelegate saveContext];
}
@end
#import "ViewController.h"
#import "TwoVc.h"
#import "Student+CoreDataClass.h"
#import "DataManager.h"
@interface ViewController ()<UITableViewDelegate,UITableViewDataSource>
@property(nonatomic,strong)UITableView * tableView;
@property(nonatomic,strong)NSMutableArray * dataSource;
@end
@implementation ViewController
-(void)viewWillAppear:(BOOL)animated{
[superviewWillAppear:animated];
// 查询数据
self.dataSource = [NSMutableArray arrayWithArray:[[DataManager shareManager]select]];
[self.tableView reloadData];
}
- (void)viewDidLoad {
[super viewDidLoad];
[selfsetNav];
}
-(UITableView*)tableView{
if (!_tableView) {
_tableView = [[UITableView alloc]initWithFrame:self.view.frame style:UITableViewStylePlain];
_tableView.delegate=self;
_tableView.dataSource=self;
[self.viewaddSubview:_tableView];
}
return _tableView;
}
-(void)setNav{
self.title = @"CoreData单表";
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"➕" style:UIBarButtonItemStylePlain target:self action:@selector(els)];
}
-(NSInteger)tableView:(UITableView*)tableView numberOfRowsInSection:(NSInteger)section{
return _dataSource.count;
}
-(UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath{
UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
if(cell ==nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"cell"];
}
Student *s = _dataSource[indexPath.row];
cell.textLabel.text = [NSString stringWithFormat:@"sex = %d,name %@,age = %d",s.sex,s.name,s.age];
returncell;
}
-(void)els{
TwoVc* t = [TwoVcnew];
[self.navigationController pushViewController:t animated:nil];
}
-(void)tableView:(UITableView*)tableView didSelectRowAtIndexPath:(NSIndexPath*)indexPath{
//点击单元格跳转界面
TwoVc* two = [TwoVcnew];
two.student=_dataSource[indexPath.row];
[self.navigationController pushViewController:two animated:nil];
}
- (void)tableView:(UITableView*)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath*)indexPath{
[[DataManagershareManager]deleteData:_dataSource[indexPath.row]];
//
[_dataSource removeObject:_dataSource[indexPath.row]];
[self.tableView reloadData];
}
@end
#import
#import "Student+CoreDataClass.h"
@interface TwoVc : UIViewController
@property (weak, nonatomic) IBOutlet UITextField *age;
@property (weak, nonatomic) IBOutlet UITextField *name;
@property (weak, nonatomic) IBOutlet UITextField *sex;
@property(nonatomic , assign)NSInteger typeID;
@property(nonatomic , strong)Student * student;
@end
#import "TwoVc.h"
#import "DataManager.h"
@interface TwoVc ()
@end
@implementation TwoVc
- (void)viewDidLoad {
[super viewDidLoad];
//右按钮
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(savetion)];
if(self.typeID==1) {
//添加数据
self.title=@"添加数据";
}else{
self.title=@"修改数据";
self.sex.text = [NSString stringWithFormat:@"%d",_student.sex];
self.name.text = _student.name;
self.age.text = [NSString stringWithFormat:@"%d",_student.age];
}
}
-(void)savetion{
if(self.typeID==1) {
//添加
self.title=@"添加数据";
[[DataManagershareManager]insert:@{@"stuID ":@([_sex.textintegerValue]),@"name":_name.text,@"age":@([_age.textintegerValue])}];
}else{
//修改
self.title=@"修改数据";
self.student.sex = [_sex.text integerValue];
self.student.name = _name.text;
self.student.age = [_age.text integerValue];
[[DataManager shareManager] updata:_student];
}
[self
.navigationController popViewControllerAnimated:YES];
}
@end
+ (NSFetchRequest *)fetchRequest;
@property (nullable, nonatomic, copy) NSString *name;
@property (nonatomic) int16_t age;
@property (nonatomic) int16_t sex;
