iOS CoreData实现数据存储（二）

前言

数据是移动端的重点关注对象，其中有一条就是数据存储。CoreData是苹果出的数据存储和持久化技术，面向对象进行数据相关存储。感兴趣的可以看下面几篇文章。
1. iOS CoreData（一）

---

实现效果

我们先看下边的gif图，主要就是实现数据的新增，已有数据的删除和修改。

1. 在数据展示界面导航点击“新增”按钮，到下一个界面，填写数据新增数据，数据的每一项不能为空。返回数据展示界面新增一条数据。
2. 点击数据展示界面的一条数据，来到数据修删界面，可以对已有的某一条数据进行修改和删除。返回数据展示界面会发现原有数据实现了删除或者修改。

CoreDataDemo.gif

---

代码实现

前面已经有了项目的需求，下面我们直接来代码实现，就不讲过多的理论了。我们先看一下工程的项目框架的搭建。

项目DEMO文件概览

下面我就分着文件给大家说

//这里主要就是对window根视图进行初始化，基本都会，就不多啰嗦了，为了整体看着全面点我也都粘贴出来了，大神务笑，哈哈。
1. AppDelegate.m

#import "AppDelegate.h"
#import "DDDataDisplayVC.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    DDDataDisplayVC *displayVC = [[DDDataDisplayVC alloc] init];
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:displayVC];
    self.window.rootViewController = nav;
    [self.window makeKeyAndVisible];
    return YES;
}

// 数据展示的实现
2. DDDataDisplayVC.h

#import 

@interface DDDataDisplayVC : UIViewController

@end

DDDataDisplayVC.m 文件

#import "DDDataDisplayVC.h"
#import "DDDataSetVC.h"
#import "DDCoreDataManager.h"
#import "PersonEntity.h"
#import "DDDataDisplayCell.h"

#define kDDDataDisplayVCCellReuseIdentify   (@"kDDDataDisplayVCCellReuseIdentify")

@interface DDDataDisplayVC () 

@property (nonatomic, strong) NSMutableArray *dataArrM;
@property (nonatomic, strong) DDCoreDataManager *dataManager;
@property (nonatomic, strong) UITableView *tableView;

@end

@implementation DDDataDisplayVC

#pragma mark - Override Base Function

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.title = @"数据展示";
    self.dataArrM = [NSMutableArray array];
    self.dataManager = [DDCoreDataManager shareCoreDataManager];
    self.tableView = [[UITableView alloc] initWithFrame:[UIScreen mainScreen].bounds];
    [self.view addSubview:self.tableView];
    self.tableView.delegate = self;
    self.tableView.dataSource = self;
    [self.tableView setSeparatorColor:[UIColor redColor]];
    self.tableView.rowHeight = 80.0;
    [self.tableView registerClass:[DDDataDisplayCell class] forCellReuseIdentifier:kDDDataDisplayVCCellReuseIdentify];
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"新增" style:UIBarButtonItemStylePlain target:self action:@selector(addData)];
    
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    
    NSFetchRequest *request = [[NSFetchRequest alloc] init];
    NSEntityDescription *entityDescription = [NSEntityDescription entityForName:@"PersonEntity" inManagedObjectContext:self.dataManager.manageObjectContext];
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"age" ascending:YES];
    NSArray *sortArr = [NSArray arrayWithObjects:sortDescriptor, nil];
    
    [request setEntity:entityDescription];
    [request setSortDescriptors:sortArr];
    
    NSError *error = nil;
    NSArray *fetchResults = [self.dataManager.manageObjectContext executeFetchRequest:request error:&error];
    if (error) {
        NSLog(@"error --- %@ --- %@",error,[error userInfo]);
    }
    [self.dataArrM removeAllObjects];
    [self.dataArrM addObjectsFromArray:fetchResults];
    [self.tableView reloadData];

}

#pragma mark - Action/Event

- (void)addData
{
    DDDataSetVC *dataSetVC = [[DDDataSetVC alloc] init];
    dataSetVC.title = @"数据增加";
    dataSetVC.type = DDDataSetVCTypeADD;
    [self.navigationController pushViewController:dataSetVC animated:NO];

}

#pragma mark - UITableViewDelegate & UITableViewDataSource

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

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    DDDataDisplayCell *cell = [tableView dequeueReusableCellWithIdentifier:kDDDataDisplayVCCellReuseIdentify forIndexPath:indexPath];
    if (!cell) {
        cell = [[DDDataDisplayCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:kDDDataDisplayVCCellReuseIdentify];
    }
    cell.personEntity = self.dataArrM[indexPath.row];
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    PersonEntity *personEntity = [self.dataArrM objectAtIndex:indexPath.row];
    DDDataSetVC *dataSetVC = [[DDDataSetVC alloc] init];
    dataSetVC.type = DDDataSetVCTypeChange;
    dataSetVC.title = @"数据修删";
    dataSetVC.personEntity = personEntity;
    [self.navigationController pushViewController:dataSetVC animated:NO];
}

@end

// 自定义cell的实现
3. DDDataDisplayCell.h

#import 
#import "PersonEntity.h"

@interface DDDataDisplayCell : UITableViewCell

@property (nonatomic, strong) PersonEntity *personEntity;

@end

DDDataDisplayCell.m 文件中

#import "DDDataDisplayCell.h"

#define kDDDataDisplayCellLabelTextColor  ([UIColor blueColor])
#define kDDDataDisplayCellScreenWidth     ([UIScreen mainScreen].bounds.size.width * 0.5)

#define kDDDataDisplayCellLabelWidth            (100.0)
#define kDDDataDisplayCellLabelHeight           (20.0)
#define kDDDataDisplayCellLabelLeftMargin       (10.0)
#define kDDDataDisplayCellLabelTopMargin        (8.0)


@interface DDDataDisplayCell ()

@property (nonatomic, strong) UILabel *nameLabel;
@property (nonatomic, strong) UILabel *genderLabel;
@property (nonatomic, strong) UILabel *locationLabel;
@property (nonatomic, strong) UILabel *ageLabel;


@end


@implementation DDDataDisplayCell

#pragma mark - Override Base Function

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        [self setupUI];
    }

    return self;
}


#pragma mark - Object Private Function

- (void)setupUI
{
    //姓名
    UILabel *nameLabel = [[UILabel alloc] init];
    nameLabel.textColor = kDDDataDisplayCellLabelTextColor;
    [self.contentView addSubview:nameLabel];
    
    //年龄
    UILabel *ageLabel = [[UILabel alloc] init];
    ageLabel.textColor = kDDDataDisplayCellLabelTextColor;
    [self.contentView addSubview:ageLabel];

    //性别
    UILabel *genderLabel = [[UILabel alloc] init];
    genderLabel.textColor = kDDDataDisplayCellLabelTextColor;
    [self.contentView addSubview:genderLabel];
    
    //地区
    UILabel *locationLabel = [[UILabel alloc] init];
    locationLabel.textColor = kDDDataDisplayCellLabelTextColor;
    [self.contentView addSubview:locationLabel];
    
    self.nameLabel = nameLabel;
    self.ageLabel = ageLabel;
    self.genderLabel = genderLabel;
    self.locationLabel = locationLabel;

}

- (void)layoutSubviews
{
    
    //姓名
    self.nameLabel.frame = CGRectMake(kDDDataDisplayCellLabelLeftMargin, kDDDataDisplayCellLabelTopMargin, kDDDataDisplayCellLabelWidth, kDDDataDisplayCellLabelHeight);
    [self.nameLabel sizeToFit];
    
    //年龄
    self.ageLabel.frame = CGRectMake(kDDDataDisplayCellScreenWidth, CGRectGetMinY(self.nameLabel.frame), kDDDataDisplayCellLabelWidth, kDDDataDisplayCellLabelHeight);
    [self.ageLabel sizeToFit];
    
    //性别
    self.genderLabel.frame = CGRectMake(CGRectGetMinX(self.nameLabel.frame), CGRectGetMaxY(self.nameLabel.frame) + kDDDataDisplayCellLabelTopMargin, kDDDataDisplayCellLabelWidth, kDDDataDisplayCellLabelHeight);
    [self.genderLabel sizeToFit];
    
    //位置
    self.locationLabel.frame = CGRectMake(CGRectGetMinX(self.ageLabel.frame), CGRectGetMinY(self.genderLabel.frame), kDDDataDisplayCellLabelWidth, kDDDataDisplayCellLabelHeight);
    [self.locationLabel sizeToFit];

}

#pragma mark - getter/setter Function

- (void)setPersonEntity:(PersonEntity *)personEntity
{
    _personEntity = personEntity;
    
    self.nameLabel.text = [NSString stringWithFormat:@"姓名：%@",self.personEntity.name];
    self.ageLabel.text = [NSString stringWithFormat:@"年龄：%@",@(self.personEntity.age)];
    NSString *genderStr = self.personEntity.gender == 0? @"女": @"男";
    self.genderLabel.text =  [NSString stringWithFormat:@"性别：%@",genderStr];
    self.locationLabel.text = [NSString stringWithFormat:@"位置：%@",self.personEntity.location];
}

@end

//  PersonEntity数据模型类
4. PersonEntity.h 类

#import 

@interface PersonEntity : NSManagedObject

@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *location;
@property (nonatomic, assign) NSInteger age;
@property (nonatomic, assign) BOOL gender;

//+ (NSString *)description;

@end

 PersonEntity.m 类的实现

#import "PersonEntity.h"

@implementation PersonEntity

@dynamic name;
@dynamic age;
@dynamic location;
@dynamic gender;

@end

// 数据设置界面的实现
5. DDDataSetVC.h

#import 
#import "PersonEntity.h"

typedef NS_ENUM(NSInteger, DDDataSetVCType) {
    DDDataSetVCTypeADD = 100,
    DDDataSetVCTypeChange
};

@interface DDDataSetVC : UIViewController

@property (nonatomic, assign) DDDataSetVCType type;
@property (nonatomic, strong) PersonEntity *personEntity;

@end

DDDataSetVC.m 文件

#import "DDDataSetVC.h"
#import "DDCoreDataManager.h"

#define kDDDataSetVCLabelTextColor                  ([UIColor blueColor])
#define kDDDataSetVCButtonTextColor                 ([UIColor blueColor])
#define kDDDataSetVCTextFieldBorderLineColor        ([UIColor magentaColor].CGColor)

#define kDDDataSetVCLabelXMargin             (50.0)
#define kDDDataSetVCLabelTopMargin           (30.0)
#define kDDDataSetVCTextFieldWidth           (200.0)
#define kDDDataSetVCTextFieldHeight          (30.0)
#define kDDDataSetVCLabelToTextFieldMargin   (8.0)

@interface DDDataSetVC ()

@property (nonatomic, strong) UILabel *nameLabel;
@property (nonatomic, strong) UILabel *genderLabel;
@property (nonatomic, strong) UILabel *locationLabel;
@property (nonatomic, strong) UILabel *ageLabel;

@property (nonatomic, strong) UITextField *nameTextField;
@property (nonatomic, strong) UITextField *genderTextField;
@property (nonatomic, strong) UITextField *locationTextField;
@property (nonatomic, strong) UITextField *ageTextField;

@property (nonatomic, strong) UIButton *saveButton;
@property (nonatomic, strong) UIButton *deleteButton;
@property (nonatomic, strong) UIButton *changeButton;

@end

@implementation DDDataSetVC

#pragma mark - Override Base Function

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor whiteColor];
    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapDidTouch)];
    [self.view addGestureRecognizer:tapGesture];
    
    [self setupUI];
}

- (void)viewWillLayoutSubviews
{
    
    //姓名
    self.nameLabel.frame = CGRectMake(kDDDataSetVCLabelXMargin, kDDDataSetVCLabelTopMargin + 100.0, CGRectGetWidth(self.nameLabel.frame), CGRectGetHeight(self.nameLabel.frame));
    
    self.nameTextField.frame = CGRectMake(CGRectGetMaxX(self.nameLabel.frame) + kDDDataSetVCLabelToTextFieldMargin , CGRectGetMidY(self.nameLabel.frame) - kDDDataSetVCTextFieldHeight * 0.5, kDDDataSetVCTextFieldWidth, kDDDataSetVCTextFieldHeight);
    
    //年龄
    self.ageLabel.frame = CGRectMake(CGRectGetMinX(self.nameLabel.frame), CGRectGetMaxY(self.nameLabel.frame) + kDDDataSetVCLabelTopMargin, CGRectGetWidth(self.ageLabel.frame), CGRectGetHeight(self.ageLabel.frame));
    
    self.ageTextField.frame = CGRectMake(CGRectGetMaxX(self.ageLabel.frame) + kDDDataSetVCLabelToTextFieldMargin , CGRectGetMidY(self.ageLabel.frame) - kDDDataSetVCTextFieldHeight * 0.5, kDDDataSetVCTextFieldWidth, kDDDataSetVCTextFieldHeight);
    
    //性别
    self.genderLabel.frame = CGRectMake(CGRectGetMinX(self.nameLabel.frame), CGRectGetMaxY(self.ageLabel.frame) + kDDDataSetVCLabelTopMargin, CGRectGetWidth(self.genderLabel.frame), CGRectGetHeight(self.genderLabel.frame));
    
    self.genderTextField.frame = CGRectMake(CGRectGetMaxX(self.genderLabel.frame) + kDDDataSetVCLabelToTextFieldMargin , CGRectGetMidY(self.genderLabel.frame) - kDDDataSetVCTextFieldHeight * 0.5, kDDDataSetVCTextFieldWidth, kDDDataSetVCTextFieldHeight);
    
    //地区
    self.locationLabel.frame = CGRectMake(CGRectGetMinX(self.nameLabel.frame), CGRectGetMaxY(self.genderLabel.frame) + kDDDataSetVCLabelTopMargin, CGRectGetWidth(self.locationLabel.frame), CGRectGetHeight(self.locationLabel.frame));
    
    self.locationTextField.frame = CGRectMake(CGRectGetMaxX(self.locationLabel.frame) + kDDDataSetVCLabelToTextFieldMargin , CGRectGetMidY(self.locationLabel.frame) - kDDDataSetVCTextFieldHeight * 0.5, kDDDataSetVCTextFieldWidth, kDDDataSetVCTextFieldHeight);
    
    switch (self.type) {
        case DDDataSetVCTypeADD:
            
            self.saveButton.frame = CGRectMake(CGRectGetMinX(self.nameLabel.frame), CGRectGetMaxY(self.locationLabel.frame) + kDDDataSetVCLabelTopMargin, CGRectGetWidth(self.nameLabel.frame) + kDDDataSetVCLabelToTextFieldMargin + kDDDataSetVCTextFieldWidth, 30.0);
            break;
            
        case DDDataSetVCTypeChange:

            self.deleteButton.frame = CGRectMake(CGRectGetMinX(self.nameLabel.frame), CGRectGetMaxY(self.locationLabel.frame) + kDDDataSetVCLabelTopMargin, CGRectGetWidth(self.nameLabel.frame) + kDDDataSetVCLabelToTextFieldMargin + kDDDataSetVCTextFieldWidth, 30.0);
            
            self.changeButton.frame = CGRectMake(CGRectGetMinX(self.nameLabel.frame), CGRectGetMaxY(self.deleteButton.frame) + kDDDataSetVCLabelTopMargin, CGRectGetWidth(self.nameLabel.frame) + kDDDataSetVCLabelToTextFieldMargin + kDDDataSetVCTextFieldWidth, 30.0);
            break;
            
        default:
            break;
    }
    
}

#pragma mark - Object Private Function

- (void)setupUI
{
    //姓名
    UILabel *nameLabel = [[UILabel alloc] init];
    nameLabel.textColor = kDDDataSetVCLabelTextColor;
    nameLabel.text = @"姓名：";
    [nameLabel sizeToFit];
    [self.view addSubview:nameLabel];
    
    UITextField *nameTextField = [[UITextField alloc] init];
    nameTextField.placeholder = @"请输入名字";
    [nameTextField setBorderStyle:UITextBorderStyleLine];
    [nameTextField.layer setBorderColor:kDDDataSetVCTextFieldBorderLineColor];
    nameTextField.layer.borderWidth = 1.0;
    [self.view addSubview:nameTextField];
    
    //年龄
    UILabel *ageLabel = [[UILabel alloc] init];
    ageLabel.textColor = kDDDataSetVCLabelTextColor;
    ageLabel.text = @"年龄：";
    [ageLabel sizeToFit];
    [self.view addSubview:ageLabel];
    
    UITextField *ageTextField = [[UITextField alloc] init];
    ageTextField.placeholder = @"请输入年龄";
    [ageTextField setBorderStyle:UITextBorderStyleLine];
    [ageTextField.layer setBorderColor:kDDDataSetVCTextFieldBorderLineColor];
    ageTextField.layer.borderWidth = 1.0;
    [self.view addSubview:ageTextField];

    //性别
    UILabel *genderLabel = [[UILabel alloc] init];
    genderLabel.textColor = kDDDataSetVCLabelTextColor;
    genderLabel.text = @"性别：";
    [genderLabel sizeToFit];
    [self.view addSubview:genderLabel];
    
    UITextField *genderTextField = [[UITextField alloc] init];
    genderTextField.placeholder = @"请输入性别";
    [genderTextField setBorderStyle:UITextBorderStyleLine];
    [genderTextField.layer setBorderColor:kDDDataSetVCTextFieldBorderLineColor];
    genderTextField.layer.borderWidth = 1.0;
    [self.view addSubview:genderTextField];

    //地区
    UILabel *locationLabel = [[UILabel alloc] init];
    locationLabel.textColor = kDDDataSetVCLabelTextColor;
    locationLabel.text = @"地区：";
    [locationLabel sizeToFit];
    [self.view addSubview:locationLabel];
    
    UITextField *locationTextField = [[UITextField alloc] init];
    locationTextField.placeholder = @"请输入位置";
    [locationTextField setBorderStyle:UITextBorderStyleLine];
    [locationTextField.layer setBorderColor:kDDDataSetVCTextFieldBorderLineColor];
    locationTextField.layer.borderWidth = 1.0;
    [self.view addSubview:locationTextField];

    self.nameLabel = nameLabel;
    self.ageLabel = ageLabel;
    self.genderLabel = genderLabel;
    self.locationLabel = locationLabel;
    
    self.nameTextField = nameTextField;
    self.ageTextField = ageTextField;
    self.genderTextField = genderTextField;
    self.locationTextField = locationTextField;
    
    //保存按钮
    UIButton *saveButton = [[UIButton alloc] init];
    [saveButton setTitle:@"保存" forState:UIControlStateNormal];
    [saveButton setTitleColor:kDDDataSetVCButtonTextColor forState:UIControlStateNormal];
    [saveButton setBackgroundColor:[UIColor lightGrayColor]];
    [saveButton addTarget:self action:@selector(saveButtonDidClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:saveButton];
    
    //删除按钮
    UIButton *deleteButton = [[UIButton alloc] init];
    [deleteButton setTitle:@"删除" forState:UIControlStateNormal];
    [deleteButton setTitleColor:kDDDataSetVCButtonTextColor forState:UIControlStateNormal];
    [deleteButton setBackgroundColor:[UIColor lightGrayColor]];
    [deleteButton addTarget:self action:@selector(deleteButtonDidClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:deleteButton];
    
    //改变按钮
    UIButton *changeButton = [[UIButton alloc] init];
    [changeButton setTitle:@"修改" forState:UIControlStateNormal];
    [changeButton setTitleColor:kDDDataSetVCButtonTextColor forState:UIControlStateNormal];
    [changeButton setBackgroundColor:[UIColor lightGrayColor]];
    [changeButton addTarget:self action:@selector(changeButtonDidClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:changeButton];
    
    
    self.saveButton = saveButton;
    self.deleteButton = deleteButton;
    self.changeButton = changeButton;
    
    if (self.type == DDDataSetVCTypeChange) {
        self.nameTextField.text = self.personEntity.name;
        self.ageTextField.text = [NSString stringWithFormat:@"%ld",self.personEntity.age];
        self.genderTextField.text = [NSString stringWithFormat:@"%d",self.personEntity.gender];
        self.locationTextField.text = self.personEntity.location;
    }
    
}

- (void)showAlertView
{
    UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:@"注意" message:@"内容不能为空" preferredStyle:UIAlertControllerStyleActionSheet];
    
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
    UIAlertAction *certainAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];
    
    [alertVC addAction:cancelAction];
    [alertVC addAction:certainAction];
    
    [self.navigationController presentViewController:alertVC animated:YES completion:nil];
    
}


#pragma mark - Action/Event

- (void)saveButtonDidClick
{
    
    if ([self.nameTextField.text isEqualToString:@""] || [self.ageTextField.text isEqualToString:@""]|| [self.genderTextField.text isEqualToString:@""] || [self.locationTextField.text isEqualToString:@""]) {
        [self showAlertView];
        return;
    }

    self.personEntity = [NSEntityDescription insertNewObjectForEntityForName:@"PersonEntity" inManagedObjectContext:[DDCoreDataManager shareCoreDataManager].manageObjectContext];
    [self.personEntity setName:self.nameTextField.text];
    [self.personEntity setAge:[self.ageTextField.text integerValue]];
    [self.personEntity setGender:[self.genderTextField.text integerValue]];
    [self.personEntity setLocation:self.locationTextField.text];
    
    NSError *error;
    BOOL isSaveSuccess = [[DDCoreDataManager shareCoreDataManager].manageObjectContext save:&error];
    if (isSaveSuccess) {
        NSLog(@"save success");
    }
    else {
        NSLog(@"save failure, reason--%@",[error userInfo]);
    }

}

- (void)deleteButtonDidClick
{
    [[DDCoreDataManager shareCoreDataManager].manageObjectContext deleteObject:self.personEntity];
    
    NSError *error;
    BOOL isSaveSuccess = [[DDCoreDataManager shareCoreDataManager].manageObjectContext save:&error];
    if (isSaveSuccess) {
        NSLog(@"save success");
        self.nameTextField.text = @"";
        self.ageTextField.text = @"";
        self.genderTextField.text = @"";
        self.locationTextField.text = @"";
    }
    else {
        NSLog(@"save failure, reason--%@",[error userInfo]);
    }
}

- (void)changeButtonDidClick
{
    if ([self.nameTextField.text isEqualToString:@""] || [self.ageTextField.text isEqualToString:@""]|| [self.genderTextField.text isEqualToString:@""] || [self.locationTextField.text isEqualToString:@""]) {
        [self showAlertView];
        return;
    }
        
    [self.personEntity setName:self.nameTextField.text];
    [self.personEntity setAge:[self.ageTextField.text integerValue]];
    [self.personEntity setGender:[self.genderTextField.text integerValue]];
    [self.personEntity setLocation:self.locationTextField.text];
    
    NSError *error;
    BOOL isSaveSuccess = [[DDCoreDataManager shareCoreDataManager].manageObjectContext save:&error];
    if (isSaveSuccess) {
        NSLog(@"save success");
    }
    else {
        NSLog(@"save failure, reason--%@",[error userInfo]);
    }
}

- (void)tapDidTouch
{
    [self.view endEditing:YES];
}

#pragma mark - Getter/Setter Function

- (void)setType:(DDDataSetVCType)type
{
    _type = type;
    
    switch (type) {
        case DDDataSetVCTypeADD:
            self.saveButton.hidden = NO;
            self.deleteButton.hidden = YES;
            self.changeButton.hidden = YES;
            break;
            
        case DDDataSetVCTypeChange:
            self.saveButton.hidden = YES;
            self.deleteButton.hidden = NO;
            self.changeButton.hidden = NO;
            break;
        
        default:
            break;
    }
}

@end

6. CoreData的封装

这个不多说了，可以直接点我链接过去，已经封装好了。

---

查看结果

1、新增数据

我们新增下面这一条数据。

新增一条数据

下面我们用Navicat查询数据库，看是否有这一条数据。

新增数据查询结果

可以看见数据库里面已经有这一条数据了，再回到数据展示页面，看是否显示。

数据展示界面

可以看见数据展示界面是有这条数据的。

2、修改数据

我们修改下面这条数据，将年龄修改为900。

待修改数据

数据修改

同样我们先看数据库。

数据修改结果

可以看见数据已经修改成功，我们回到数据展示层看是否修改成功。

数据修改展示

可以看见数据修改成功。

3、 数据删除

我们先选择一条要删除的数据。

待删除数据

进行数据删除

删除数据

查看数据库

查看数据库

可以看见数据已经被删除，回到数据展示界面。

数据展示界面

可以看见数据展示界面，该条数据也被删除了。

致谢

  谢谢每一个关注我的人，谢谢大家！