UI基础 - UITableView 05：对单元格进行编辑（同步了数据源） - 低头捡石頭

UI基础 - UITableView 05：对单元格进行编辑（同步了数据源）

■ 对单元格的编辑处理：同步数据源

1. 当我们对 cell 进行编辑时，往往伴随着对数据的处理，无数据处理的编辑是没有任何意义的！

// - Student.h：数据存储

1 #import <Foundation/Foundation.h>
2 @interface Student : NSObject
3 
4 @property(nonatomic,copy)NSString *name;
5 @property(nonatomic,copy)NSString *sex;
6 @property(nonatomic,copy)NSString *age;
7 @property(nonatomic,copy)NSString *phoneNumer;
8 
9 @end

// - StudentData.h：管理数据源的 model 层

 1 #import <Foundation/Foundation.h>
 2 // 注意引用 UIKit 头文件，否则 .m 文件中使用 indexPath 不提示，报错
 3 #import <UIKit/UIKit.h>
 4 @class Student;
 5 @interface StudentData : NSObject
 6 
 7 @property(nonatomic,strong)NSMutableArray *dataArray;// 数据源：学生信息
 8 
 9 + (StudentData *)shareData;// 单例
10 
11 /** @brief   根据 indexPath 返回一个学生实例
12  */
13 -(Student*)studentAtIndexPath:(NSIndexPath*)indexPath;
14 
15 /**@brief   根据区号返回区头标题
16  */
17 -(NSString *)headerTitleInsection:(NSInteger )section;
18 
19 /**@brief   根据 indexPath 删除一个学生实例
20  */
21 - (void)removeStudentAnIndexPath:(NSIndexPath *)indexPath;
22 
23 /**@brief   根据 indexPath 添加一个学生实例
24  */
25 - (void)insertStudentIndesPath:(NSIndexPath*)indexPath;
26 
27 /**@brief   把一个学生从一个位置移动到另一个位置
28  */
29 - (void)moveStudentFromSourceIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath;
30 
31 @end

// - StudentData.m：实现编辑操作，如增、删、拖动

 1 #import "StudentData.h"
 2 #import "Student.h"
 3 static StudentData *dataHandle = nil;
 4 
 5 @implementation StudentData
 6 
 7 + (StudentData *)shareData{
 8 
 9     if (!dataHandle) {
10 
11         dataHandle = [[StudentData alloc]init];
12         [dataHandle loadHardCode];
13     }
14 
15     return dataHandle;
16 }
17 
18 // 加载数据
19 -(void)loadHardCode{
20 
21     self.dataArray = [NSMutableArray array];
22     for (int i = 0; i < 2; i ++) {
23 
24         NSMutableArray *smallArray = [NSMutableArray arrayWithCapacity:1];
25 
26         // 每轮创建 10 个学生
27         for (int j =0; j < 10; j ++) {
28 
29             Student *stu = [[Student alloc] init];
30             // 姓名
31             if (i == 0) {
32                 stu.name = [NSString stringWithFormat:@"Hazell%d号",j];
33             }else{
34                 
35                 stu.name = [NSString stringWithFormat:@"Bruce%d号",j];
36             }
37             
38             // 年龄
39             stu.age = [NSString stringWithFormat:@"%d",arc4random()%20 +20];// 20-39
40             // 手机号码
41             stu.phoneNumer = [NSString stringWithFormat:@"185%08d",arc4random()%100000000];
42             
43             // 性别判断
44             if (j % 2 == 0) {
45                 stu.sex = @"male";
46             }else{
47                 stu.sex = @"female";
48             }
49             
50             [smallArray addObject:stu];
51          }
52 
53         [self.dataArray addObject:smallArray];
54     }
55 }
56 
57 
58 - (Student *)studentAtIndexPath:(NSIndexPath *)indexPath{
59 
60     return [[self.dataArray objectAtIndex:indexPath.section ] objectAtIndex:indexPath.row];
61 }
62 
63 - (NSString *)headerTitleInsection:(NSInteger )section{
64 
65     return [[NSArray arrayWithObjects:@"H组",@"B组", nil] objectAtIndex:section];
66 }
67 
68 - (void)removeStudentAnIndexPath:(NSIndexPath *)indexPath{
69 
70     [_dataArray[indexPath.section] removeObjectAtIndex:indexPath.row];
71 }
72 
73 - (void)insertStudentIndesPath:(NSIndexPath*)indexPath{
74     
75     Student *stu = [[Student alloc] init];
76     NSInteger j = 1000000+arc4random()%100;
77     stu.name = [NSString stringWithFormat:@"Hazell%ld号",j];
78     stu.age = [NSString stringWithFormat:@"%d",arc4random()%20 +20];//20-39
79     stu.phoneNumer = [NSString stringWithFormat:@"185%08d",arc4random()%100000000];
80     if (j % 2 == 0) {
81         stu.sex = @"male";
82     }else{
83         stu.sex = @"female";
84     }
85 
86     [_dataArray[indexPath.section] insertObject:stu atIndex:indexPath.row];
87 }
88 
89 - (void)moveStudentFromSourceIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath{
90 
91     // 获取原位置的实例
92     Student *stu = [self studentAtIndexPath:sourceIndexPath];
93     // 从原位置删除
94     [self removeStudentAnIndexPath:sourceIndexPath];
95     // 添加到新位置：先取到小数组（分区）,再在小数组（分区）中添加元素；
96     [[self.dataArray objectAtIndex:destinationIndexPath.section] insertObject:stu atIndex:destinationIndexPath.row];
97 }
98 @end

// - ViewController.m

  1 #import "ViewController.h"
  2 #import "StudentData.h"
  3 #import "Student.h"
  4 @interface ViewController ()<UITableViewDataSource,UITableViewDelegate>
  5 
  6 @property(nonatomic,strong)UITableView *tableView;
  7 
  8 @end
  9 
 10 @implementation ViewController
 11 
 12 - (void)viewDidLoad {
 13     [super viewDidLoad];
 14 
 15     self.navigationItem.title = @"cell编辑";
 16     self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"编辑" style:UIBarButtonItemStyleDone target:self action:@selector(editTableView:)];
 17     self.tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, self.view.frame.size.height-64) style:UITableViewStylePlain];
 18     _tableView.dataSource = self;
 19     _tableView.delegate = self;
 20     [self.view addSubview:_tableView];
 21 }
 22 
 23 // 编辑
 24 - (void)editTableView:(UIBarButtonItem *)barItem{
 25 
 26     if (_tableView.editing) {
 27         barItem.title = @"编辑";
 28     }else{
 29         barItem.title = @"完成";
 30     }
 31 
 32     [_tableView setEditing:!_tableView.editing animated:YES];
 33 }
 34 
 35 #pragma mark - <UITableViewDataSource>
 36 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
 37 
 38     return [[StudentData shareData].dataArray[section] count];
 39 }
 40 
 41 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
 42 
 43     return [StudentData shareData].dataArray.count;
 44 }
 45 
 46 // cell
 47 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
 48     static NSString *cellIndetifier = @"cell";
 49     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIndetifier];
 50     if (!cell) {
 51         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellIndetifier];
 52     }
 53 
 54     Student * stu = [[StudentData shareData] studentAtIndexPath:indexPath];
 55     cell.textLabel.text = [NSString stringWithFormat:@"Name：%@  Sex：%@",stu.name,stu.sex];
 56     cell.detailTextLabel.text = [NSString stringWithFormat:@"Age：%@  phoneNumer：%@",stu.age,stu.phoneNumer];
 57     return cell;
 58 }
 59 
 60 - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{
 61 
 62     return [[StudentData shareData] headerTitleInsection:section];
 63 }
 64 
 65 #pragma mark - 编辑
 66 -(void)setEditing:(BOOL)editing animated:(BOOL)animated{
 67 
 68     [super setEditing:editing animated:animated];
 69     [_tableView setEditing:editing animated:animated];
 70 }
 71 
 72 //// 哪些行可以编辑：默认是全部可以
 73 //- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath{
 74 //
 75 //    if (indexPath.row == 0 && indexPath.section == 1){
 76 //        return NO;
 77 //    }
 78 //    return YES;
 79 //}
 80 
 81 
 82 - (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath{
 83 
 84     if (indexPath.row == 1 | indexPath.row == 5) {
 85         return UITableViewCellEditingStyleInsert;// 添加
 86     }else{
 87         return UITableViewCellEditingStyleDelete;// 删除
 88     }
 89 }
 90 
 91 - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{
 92 
 93     if (editingStyle == UITableViewCellEditingStyleDelete) {
 94 
 95         [[StudentData shareData] removeStudentAnIndexPath:indexPath];
 96         [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
 97 
 98     }else if (editingStyle == UITableViewCellEditingStyleInsert){
 99 
100         NSIndexPath *inserIndexPath = [NSIndexPath indexPathForRow:indexPath.row+1 inSection:indexPath.section];
101         [[StudentData shareData] insertStudentIndesPath:inserIndexPath];
102         [tableView insertRowsAtIndexPaths:[NSArray arrayWithObjects:inserIndexPath, nil] withRowAnimation:UITableViewRowAnimationFade];
103     }
104 }
105 
106 #pragma mark - 移动
107 - (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath{
108 
109     return YES;
110 }
111 
112 - (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath{
113     
114     [[StudentData shareData] moveStudentFromSourceIndexPath:sourceIndexPath toIndexPath:destinationIndexPath];
115 }
116 
117 // 限制跨区移动
118 - (NSIndexPath *)tableView:(UITableView *)tableView targetIndexPathForMoveFromRowAtIndexPath:(NSIndexPath *)sourceIndexPath toProposedIndexPath:(NSIndexPath *)proposedDestinationIndexPath{
119 
120     if (sourceIndexPath.section == proposedDestinationIndexPath.section){
121         return proposedDestinationIndexPath;
122 
123     }else{
124         return sourceIndexPath;
125     }
126 }
127 
128 #pragma mark - <UITableViewDelegate>
129 // 进入编辑且点击删除，修改提示标题
130 - (NSString *)tableView:(UITableView *)tableView titleForDeleteConfirmationButtonForRowAtIndexPath:(NSIndexPath *)indexPath{
131 
132     if (indexPath.row == 0) {
133         return @"delete";
134     }
135     return @"删除";
136 }
137 
138 // 设置进入编辑状态时，cell 不会缩进
139 // 前提是在 editingStyleForRowAtIndexPath: 方法中，编辑样式为 UITableViewCellEditingStyleNone
140 - (BOOL)tableView: (UITableView *)tableView shouldIndentWhileEditingRowAtIndexPath:(NSIndexPath *)indexPath{
141 
142     return NO;
143 }
144 
145 @end