1 #import "ClassController.h"
2 #import "LOClass.h"
3 #import "Student.h"
4 #import "Teacher.h"
5 #import "AppDelegate.h"
6 #import "StudentController.h"
7 @interface ClassController ()
8 @property (nonatomic,strong) NSMutableArray *classArray;
9 @property (nonatomic,strong)NSManagedObjectContext *mContext;
10 @end
11
12 @implementation ClassController
13 -(NSMutableArray *)classArray
14 {
15 if (_classArray == nil) {
16 _classArray = [NSMutableArray new];
17 }
18 return _classArray;
19 }
20 - (void)viewDidLoad {
21 [super viewDidLoad];
22 AppDelegate *appDelegate = [UIApplication sharedApplication].delegate;
23 //获取数据管理器类
24 self.mContext = appDelegate.managedObjectContext;
25
26 }
27 -(void)viewWillAppear:(BOOL)animated
28 {
29 [super viewWillAppear:animated];
30 [self reloadClass];
31 }
32 static NSString *reuseIdentifier = @"cell";
33 //获取所有班级的方法
34 -(NSArray *)getAllClass
35 {
36 //创建查询请求
37 NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"LOClass"];
38 //实体属性
39 NSEntityDescription *LOClassED = [NSEntityDescription entityForName:@"LOClass" inManagedObjectContext:self.mContext];
40 fetchRequest.entity = LOClassED;
41 //排序属性
42 NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
43 fetchRequest.sortDescriptors = @[sort];
44 //谓词,不写表示查询所有的
45 //返回查询结果
46 return [self.mContext executeFetchRequest:fetchRequest error:nil];
47 }
48
49 - (IBAction)addClassAction:(UIBarButtonItem *)sender {
50 //实体描述
51 NSEntityDescription *classED = [NSEntityDescription entityForName:@"LOClass" inManagedObjectContext:self.mContext];
52 //创建班级
53 LOClass *loClass = [[LOClass alloc] initWithEntity:classED insertIntoManagedObjectContext:self.mContext];
54 //给属性赋值
55
56 loClass.name = [NSString stringWithFormat:@"研%d",arc4random()%20 + 1];
57 loClass.address = @"金五星商厦蓝鸥科技";
58 NSSet *studentSet = [NSSet setWithArray:[self studentArray]];
59 //建立表关系
60 [loClass addStudentRelation:studentSet];
61
62 //创建老师的实体描述
63 NSEntityDescription *teacherED = [NSEntityDescription entityForName:@"Teacher" inManagedObjectContext:self.mContext];
64 Teacher *tea = [[Teacher alloc] initWithEntity:teacherED insertIntoManagedObjectContext:self.mContext];
65 tea.name = [NSString stringWithFormat:@"王%d",arc4random()%30];
66 tea.course = @"编程";
67 //建立与老师的表关系
68 loClass.techerRelation = tea;
69
70 //保存
71 NSError *error = nil;
72 [self.mContext save:&error];
73 if (error) {
74 NSLog(@"保存失败,错误:%@",error);
75 }
76 //刷新 班级
77 [self reloadClass];
78 }
79 //刷新tableView的班级
80 -(void)reloadClass
81 {
82 [self.classArray removeAllObjects];
83 [self.classArray addObjectsFromArray:[self getAllClass]];
84 [self.tableView reloadData];
85 }
86
87 //随机创建学生
88 -(NSArray *)studentArray
89 {
90 NSInteger count = arc4random()%20 + 11;
91 NSMutableArray *arr = [NSMutableArray array];
92 for (int i = 0; i < count; i++) {
93 NSEntityDescription *studentED = [NSEntityDescription entityForName:@"Student" inManagedObjectContext:self.mContext];
94 Student *stu = [[Student alloc] initWithEntity:studentED insertIntoManagedObjectContext:self.mContext];
95 stu.name = [NSString stringWithFormat:@"张%d",arc4random()%50];
96 stu.age = @(arc4random()%30 + 18);
97 stu.gender = arc4random()%2?@"男":@"女";
98 //添加到数组里
99 [arr addObject:stu];
100
101 }
102 return arr;
103 }
104
105 - (void)didReceiveMemoryWarning {
106 [super didReceiveMemoryWarning];
107 // Dispose of any resources that can be recreated.
108 }
109
110 #pragma mark - Table view data source
111
112 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
113
114 return 1;
115 }
116
117 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
118
119 return self.classArray.count;
120 }
121
122
123 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
124 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reuseIdentifier forIndexPath:indexPath];
125 LOClass *loClass = self.classArray[indexPath.row];
126 cell.textLabel.text = loClass.name;
127
128
129 return cell;
130 }
131 //进行传值
132 -(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
133 {
134 StudentController *studentVC = [segue destinationViewController];
135 NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
136 studentVC.loClass = self.classArray[indexPath.row];
137 }
138 // Override to support conditional editing of the table view.
139 - (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
140 // Return NO if you do not want the specified item to be editable.
141 return YES;
142 }
143
144
145
146 // Override to support editing the table view.
147 - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
148 if (editingStyle == UITableViewCellEditingStyleDelete) {
149 //1.先从数据库里进行删除
150
151 //创建查询请求
152 NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"LOClass"];
153 //创建实体描述
154 NSEntityDescription *classED = [NSEntityDescription entityForName:@"LOClass" inManagedObjectContext:self.mContext];
155 //设置查询条件的实体属性
156 fetchRequest.entity = classED;
157 //创建查询条件
158 LOClass *loClass = self.classArray[indexPath.row];
159 NSString *name = loClass.name;
160 NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name = %@",name];
161 //设置查询请求的谓词属性
162 fetchRequest.predicate = predicate;
163 //创建排序器 NSSortDescription
164 NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
165 fetchRequest.sortDescriptors = @[sort];
166 NSArray *result = [self.mContext executeFetchRequest:fetchRequest error:nil];
167 for (LOClass *loClass in result) {
168 [self.mContext deleteObject:loClass];
169 }
170 [self.mContext save:nil];
171
172 //2.从内存中删除
173 [self.classArray removeObjectAtIndex:indexPath.row];
174
175 //3.从视图上删除
176 [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
177 } else if (editingStyle == UITableViewCellEditingStyleInsert) {
178 // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
179 }
180 }
181
182 @end
1 #import <UIKit/UIKit.h>
2 #import "LOClass.h"
3 @interface StudentController : UITableViewController
4 @property (nonatomic,strong) LOClass *loClass;
5 @end
1 #import "StudentController.h"
2 #import "student.h"
3 #import "AppDelegate.h"
4 @interface StudentController ()
5 @property (nonatomic,strong) NSMutableArray *studentArray;
6 @property (nonatomic,strong) NSManagedObjectContext *mContext;
7 @end
8 static NSString *identifier = @"cell";
9 @implementation StudentController
10
11 - (void)viewDidLoad {
12 [super viewDidLoad];
13 AppDelegate *appDelegate = [UIApplication sharedApplication].delegate;
14 //获取数据管理器类
15 self.mContext = appDelegate.managedObjectContext;
16
17 self.studentArray = [NSMutableArray arrayWithArray: self.loClass.studentRelation.allObjects];
18 }
19
20 - (void)didReceiveMemoryWarning {
21 [super didReceiveMemoryWarning];
22 // Dispose of any resources that can be recreated.
23 }
24
25 #pragma mark - Table view data source
26
27 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
28
29 return 1;
30 }
31
32 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
33
34 return self.studentArray.count;
35 }
36
37
38 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
39 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier forIndexPath:indexPath];
40
41 Student *stu = self.studentArray[indexPath.row];
42 cell.textLabel.text = stu.name;
43
44
45 return cell;
46 }
47
48
49
50 // Override to support conditional editing of the table view.
51 - (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
52 // Return NO if you do not want the specified item to be editable.
53 return YES;
54 }
55
56
57
58 // Override to support editing the table view.
59 - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
60 if (editingStyle == UITableViewCellEditingStyleDelete) {
61 //创建查询请求
62 NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"Student"];
63 //创建实体描述
64 NSEntityDescription *studentED = [NSEntityDescription entityForName:@"Student" inManagedObjectContext:self.mContext];
65 //设置查询条件的实体属性
66 fetchRequest.entity = studentED;
67 //创建查询条件
68 Student *student = self.studentArray[indexPath.row];
69 NSString *name = student.name;
70 NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name = %@",name];
71 //设置查询请求的谓词属性
72 fetchRequest.predicate = predicate;
73 //创建排序器 NSSortDescription
74 NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
75 fetchRequest.sortDescriptors = @[sort];
76 NSArray *result = [self.mContext executeFetchRequest:fetchRequest error:nil];
77 for (Student *loClass in result) {
78 [self.mContext deleteObject:loClass];
79 }
80 [self.mContext save:nil];
81 [self.studentArray removeObjectAtIndex:indexPath.row];
82 [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
83 } else if (editingStyle == UITableViewCellEditingStyleInsert) {
84 // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
85 }
86 }
87
88 @end
