CoreData数据持久化实现收藏功能

主要实现的功能 :底部有两个标签控制器 点击第一个标签控制器的单元格 第二个控制器里就有相应的数据 实现数据持久化收藏功能

第一步:首先创建两个标签控制器

#import “oneViewController.h”
#import “ViewController.h”
#import “twoViewController.h”

@interface oneViewController ()

@end

@implementation oneViewController

  • (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    ViewController *one=[ViewController new];

    UINavigationController *onenav=[[UINavigationController alloc]initWithRootViewController:one];

    onenav.tabBarItem=[[UITabBarItem alloc]initWithTitle:@“首页” image:[UIImage imageNamed:@“5”] selectedImage:[UIImage imageNamed:@“5”]];

    twoViewController *two=[twoViewController new];

    UINavigationController *twonav=[[UINavigationController alloc]initWithRootViewController:two];

    twonav.tabBarItem=[[UITabBarItem alloc]initWithTitle:@“我的收藏” image:[UIImage imageNamed:@“5”] selectedImage:[UIImage imageNamed:@“5”]];

    [email protected][onenav,twonav];

}
@end

因为当时没有在VC里面创建标签控制器 在OneVc创建的标签栏 所以在Appdelegate.m里面 设置根控制器为OneVc

#import “AppDelegate.h”
#import “oneViewController.h”
@interface AppDelegate ()

@end

@implementation AppDelegate

  • (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    self.window.rootViewController=[oneViewController new];

    return YES;
    }

第二部:开始解析接口里面的数据 并且进行CoreData实现收藏功能

1.创建DataModel继承NSObject 在DataModel.h里面定义接口里面的属性

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface DataModel : NSObject
@property(nonatomic,strong)NSString *content;
@property(nonatomic,strong)NSString *updatetime;
@property(nonatomic,strong)NSString *hashId;

@end

然后在DataModel.m里面 写-(void)setValue:(id)value forUndefinedKey:(NSString *)key{

}这个方法

--------- 其次在创建一个Model类继承NSobject 在这个Model类里面主要写 了一些关于CoreData的一些增删改查的一些数据

首先在Model.h里定义一些方法:

#import <Foundation/Foundation.h>
#import “AppDelegate.h”
#import “Entity+CoreDataClass.h”

NS_ASSUME_NONNULL_BEGIN

@interface Model : NSObject{

AppDelegate *app;

}

//创建单利方法

//单利方法
+(instancetype)initData;
//添加数据
-(void)addData:(NSDictionary * )dic;
//删除数据
-(void)deleteData:(Entity *)data;
//修改
-(void)upData;
//查询
-(NSMutableArray *)array;

@end

其次在Model.m里面 实现这些方法

#import “Model.h”
#import “DataModel.h”
//创建静态变量
static Model *da;

@implementation Model
+(instancetype)initData{

if (!da) {
    da = [[Model alloc] init];
    
}
return da;

}

-(void)addData:(NSDictionary *)dic{

//创建appdelegate对象
app = (AppDelegate *)[[UIApplication sharedApplication] delegate];
//创建实体对象  NSEntityDescription(实体描叙对象)
Entity *cla = [NSEntityDescription insertNewObjectForEntityForName:@"Entity" inManagedObjectContext:app.persistentContainer.viewContext];

// DataModel *mod=[DataModel new];

// cla.name=dic[mod.content];
// cla.time=dic[mod.updatetime];

NSLog(@"dic====%@",[dic objectForKey:@"name"]);
NSLog(@"time====%@",[dic objectForKey:@"time"]);

cla.name=dic[@"name"];
cla.time=dic[@"time"];

//
[app saveContext];
}

//删除数据

  • (void)deleteData:(Entity *)data{

    //创建appdelegate对象
    app = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    //删除
    [app.persistentContainer.viewContext deleteObject:data];
    //保存数据
    [app saveContext];

}

//修改数据

  • (void)upData{

    //创建appdelegate对象
    app = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    //保存数据
    [app saveContext];

}

//查询数据

  • (NSMutableArray *)array{

    //创建appdelegate对象
    app = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    //创建请求数据对象
    NSFetchRequest *requst = [[NSFetchRequest alloc] init];
    //创建实体描述类
    NSEntityDescription *ent = [NSEntityDescription entityForName:@“Entity” inManagedObjectContext:app.persistentContainer.viewContext];
    //获取数据
    [requst setEntity:ent];
    //从实体中获取数据
    NSArray *arr = [app.persistentContainer.viewContext executeFetchRequest:requst error:nil];

    return [arr mutableCopy];

}

@end

2.然后在View文件夹里面创建TableViewCell 继承UITableViewCell

利用xib进行约束CoreData数据持久化实现收藏功能
进行拖拽 在TableViewCell.h里面 引入DataModel的头文件
#import <UIKit/UIKit.h>
#import “DataModel.h”

NS_ASSUME_NONNULL_BEGIN

@interface TableViewCell : UITableViewCell
@property (weak, nonatomic) IBOutlet UILabel *lab1;
@property (weak, nonatomic) IBOutlet UILabel *lab2;
-(void)setDataModel:(DataModel *)model;
@end

在TableViewCell.m里面 :-(void)setDataModel:(DataModel *)model{

if (model) {
    
    self.lab1.text=model.content;
    self.lab2.text=model.updatetime;
    
    
}

}这个方法

3.在VC.m里面进行解析接口的数据 并且点击单元格 进行添加数据

#import “ViewController.h”
#import <AFNetworking.h>
#import “TableViewCell.h”
#import “DataModel.h”
#import “Model.h”
#import “twoViewController.h”

@interface ViewController ()<UITableViewDelegate,UITableViewDataSource>
@property(nonatomic,strong)UITableView *tab;
@property(nonatomic,strong)NSMutableArray *arr;

@end

@implementation ViewController

  • (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.tab=[[UITableView alloc]initWithFrame:self.view.frame style:UITableViewStylePlain];
    [email protected]“好好学习”;
    self.tab.delegate=self;
    self.tab.dataSource=self;
    self.arr=[[NSMutableArray alloc]init];

    [self.view addSubview:self.tab];

    [self.tab registerNib:[UINib nibWithNibName:@“TableViewCell” bundle:nil] forCellReuseIdentifier:@“cell”];

    [self loadData];
    }

-(void)loadData{

AFHTTPSessionManager *manger=[AFHTTPSessionManager manager];

manger.responseSerializer=[AFHTTPResponseSerializer serializer];


[manger GET:@"http://v.juhe.cn/joke/content/list.php?key=eaaf69cdca2f46e403a264f5ef7cb74b&time=1418816972" parameters:nil progress:^(NSProgress * _Nonnull downloadProgress) {
    
} success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
    
    NSLog(@"请求成功");
    
    NSDictionary *dic=[NSJSONSerialization JSONObjectWithData:responseObject options:1 error:nil];
    
    NSDictionary *dic1=[dic objectForKey:@"result"];
    
    NSDictionary *arr=[dic1 objectForKey:@"data"];
    NSLog(@"  随意%@",arr);
    for (NSDictionary *dic in arr) {
        
        DataModel *model=[DataModel new];
        
        [model setValuesForKeysWithDictionary:dic];
        
        
        [self.arr addObject:model];
        
        NSLog(@"%@",self.arr);
    }
    
    dispatch_async(dispatch_get_main_queue(), ^{
        [self.tab reloadData];
    });
    
    
    
    
    
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
    
    NSLog(@"请求失败");
    
}];

}

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

return self.arr.count;

}

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

static NSString *[email protected]"cell";

TableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:oj];


if (cell==nil) {
    cell=[[TableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:oj];
}


DataModel *model=self.arr[indexPath.row];

cell.lab1.text=model.content;
cell.lab2.text=model.updatetime;

return cell;

}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

[[Model initData]addData:@{@"name":[self.arr[indexPath.row] content],@"time":[self.arr[indexPath.row] updatetime]}];



[self.tab deselectRowAtIndexPath:indexPath animated:YES];

}

@end

4.其次创建第二个控制器twoViewController

在two.m里面实现视图即将出现的时候讲数据添加到表格中并且删除数据

#import “twoViewController.h”
#import “Model.h”
#import “DataModel.h”
#import “Entity+CoreDataClass.h”

@interface twoViewController ()<UITableViewDelegate,UITableViewDataSource>
@property(nonatomic,strong)UITableView *tab;

@property(nonatomic,strong)NSMutableArray *array;

@end

@implementation twoViewController

  • (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    self.tab=[[UITableView alloc]initWithFrame:self.view.frame style:UITableViewStylePlain];

    self.tab.delegate=self;
    self.tab.dataSource=self;

    [self.view addSubview:self.tab];

    self.array=[[NSMutableArray alloc]init];
    // [self dian];

}

//视图即将出现

-(void)viewWillAppear:(BOOL)animated{

self.array=[[Model initData]array];

[self.tab reloadData];

}

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

return self.array.count;

}

-(void)dian{

DataModel *mode=[DataModel new];


NSDictionary *[email protected]{@"name":mode.content,@"time":mode.updatetime};



[[Model initData]addData:dic];

[self.navigationController popViewControllerAnimated:YES];

}

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

static NSString *[email protected]"cell";


UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:oj];


if (cell==nil) {
    cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:oj];
    
    
}

self.tab.rowHeight=200;

// DataModel *mod=_array[indexPath.row];

//将数据放到实体对象里面通过实体对象进行赋值
Entity *cla=_array[indexPath.row];

// DataModel *model=self.array[indexPath.row];

cell.textLabel.text=cla.name;
cell.textLabel.numberOfLines=0;
cell.detailTextLabel.text=cla.time;


return cell;

}

-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{

   //创建实体
Entity *cla=self.array[indexPath.row];

//调用删除数据的方法
[[Model initData]deleteData:cla];

//重新获取数据
self.array=[[Model initData]array];

//刷新表格
[self.tab reloadData];

}

@end