iOS CoreData實現數據存儲（二）

前言

數據是移動端的重點關注對象，其中有一條就是數據存儲。CoreData是蘋果出的數據存儲和持久化技術，面向對象進行數據相關存儲。感興趣的可以看下面幾篇文章。
1. iOS CoreData（一）

實現效果

我們先看下邊的gif圖，主要就是實現數據的新增，已有數據的刪除和修改。

在數據展示界面導航點擊“新增”按鈕，到下一個界面，填寫數據新增數據，數據的每一項不能為空。返回數據展示界面新增一條數據。
點擊數據展示界面的一條數據，來到數據修刪界面，可以對已有的某一條數據進行修改和刪除。返回數據展示界面會發現原有數據實現了刪除或者修改。

CoreDataDemo.gif

代碼實現

前面已經有了項目的需求，下面我們直接來代碼實現，就不講過多的理論了。我們先看一下工程的項目框架的搭建。

項目DEMO文件概覽

下面我就分著文件給大家說

//這里主要就是對window根視圖進行初始化，基本都會，就不多啰嗦了，為了整體看著全面點我也都粘貼出來了，大神務笑，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;
}

// 數據展示的實現
2. DDDataDisplayVC.h

#import <UIKit/UIKit.h>

@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 () <UITableViewDelegate, UITableViewDataSource>

@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 = @"數據展示";
    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 = @"數據增加";
    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 = @"數據修刪";
    dataSetVC.personEntity = personEntity;
    [self.navigationController pushViewController:dataSetVC animated:NO];
}

@end

// 自定義cell的實現
3. DDDataDisplayCell.h

#import <UIKit/UIKit.h>
#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];
    
    //年齡
    UILabel *ageLabel = [[UILabel alloc] init];
    ageLabel.textColor = kDDDataDisplayCellLabelTextColor;
    [self.contentView addSubview:ageLabel];

    //性別
    UILabel *genderLabel = [[UILabel alloc] init];
    genderLabel.textColor = kDDDataDisplayCellLabelTextColor;
    [self.contentView addSubview:genderLabel];
    
    //地區
    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];
    
    //年齡
    self.ageLabel.frame = CGRectMake(kDDDataDisplayCellScreenWidth, CGRectGetMinY(self.nameLabel.frame), kDDDataDisplayCellLabelWidth, kDDDataDisplayCellLabelHeight);
    [self.ageLabel sizeToFit];
    
    //性別
    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:@"年齡：%@",@(self.personEntity.age)];
    NSString *genderStr = self.personEntity.gender == 0? @"女": @"男";
    self.genderLabel.text =  [NSString stringWithFormat:@"性別：%@",genderStr];
    self.locationLabel.text = [NSString stringWithFormat:@"位置：%@",self.personEntity.location];
}

@end

//  PersonEntity數據模型類
4. PersonEntity.h 類

#import <CoreData/CoreData.h>

@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 類的實現

#import "PersonEntity.h"

@implementation PersonEntity

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

@end

// 數據設置界面的實現
5. DDDataSetVC.h

#import <UIKit/UIKit.h>
#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);
    
    //年齡
    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);
    
    //性別
    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);
    
    //地區
    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 = @"請輸入名字";
    [nameTextField setBorderStyle:UITextBorderStyleLine];
    [nameTextField.layer setBorderColor:kDDDataSetVCTextFieldBorderLineColor];
    nameTextField.layer.borderWidth = 1.0;
    [self.view addSubview:nameTextField];
    
    //年齡
    UILabel *ageLabel = [[UILabel alloc] init];
    ageLabel.textColor = kDDDataSetVCLabelTextColor;
    ageLabel.text = @"年齡：";
    [ageLabel sizeToFit];
    [self.view addSubview:ageLabel];
    
    UITextField *ageTextField = [[UITextField alloc] init];
    ageTextField.placeholder = @"請輸入年齡";
    [ageTextField setBorderStyle:UITextBorderStyleLine];
    [ageTextField.layer setBorderColor:kDDDataSetVCTextFieldBorderLineColor];
    ageTextField.layer.borderWidth = 1.0;
    [self.view addSubview:ageTextField];

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

    //地區
    UILabel *locationLabel = [[UILabel alloc] init];
    locationLabel.textColor = kDDDataSetVCLabelTextColor;
    locationLabel.text = @"地區：";
    [locationLabel sizeToFit];
    [self.view addSubview:locationLabel];
    
    UITextField *locationTextField = [[UITextField alloc] init];
    locationTextField.placeholder = @"請輸入位置";
    [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;
    
    //保存按鈕
    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];
    
    //刪除按鈕
    UIButton *deleteButton = [[UIButton alloc] init];
    [deleteButton setTitle:@"刪除" forState:UIControlStateNormal];
    [deleteButton setTitleColor:kDDDataSetVCButtonTextColor forState:UIControlStateNormal];
    [deleteButton setBackgroundColor:[UIColor lightGrayColor]];
    [deleteButton addTarget:self action:@selector(deleteButtonDidClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:deleteButton];
    
    //改變按鈕
    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:@"內容不能為空" preferredStyle:UIAlertControllerStyleActionSheet];
    
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
    UIAlertAction *certainAction = [UIAlertAction actionWithTitle:@"確定" 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的封裝

這個不多說了，可以直接點我鏈接過去，已經封裝好了。

查看結果

1、新增數據

我們新增下面這一條數據。

新增一條數據

下面我們用Navicat查詢數據庫，看是否有這一條數據。

新增數據查詢結果

可以看見數據庫里面已經有這一條數據了，再回到數據展示頁面，看是否顯示。

數據展示界面

可以看見數據展示界面是有這條數據的。

2、修改數據

我們修改下面這條數據，將年齡修改為900。

待修改數據

數據修改

同樣我們先看數據庫。

數據修改結果

可以看見數據已經修改成功，我們回到數據展示層看是否修改成功。

數據修改展示

可以看見數據修改成功。

3、數據刪除

我們先選擇一條要刪除的數據。

待刪除數據

進行數據刪除

刪除數據

查看數據庫

可以看見數據已經被刪除，回到數據展示界面。

數據展示界面

可以看見數據展示界面，該條數據也被刪除了。

致謝

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最后編輯于：2018.09.21 09:49:41

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三个男躁一个女,国精产品一区一手机的秘密,麦子交换系列最经典十句话,欧美国产综合欧美视频

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iOS CoreData實現數據存儲（二）

前言

實現效果

代碼實現

查看結果

1、新增數據

2、修改數據

3、數據刪除

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推薦閱讀更多精彩內容

三个男躁一个女,国精产品一区一手机的秘密,麦子交换系列最经典十句话,欧美 国产 综合 欧美 视频

iOS CoreData實現數據存儲（二）

前言

實現效果

代碼實現

查看結果

1、新增數據

2、修改數據

3、 數據刪除

致謝

推薦閱讀更多精彩內容

三个男躁一个女,国精产品一区一手机的秘密,麦子交换系列最经典十句话,欧美国产综合欧美视频

3、數據刪除