UItableView 日常学习总结
实现类似 QQ联系人收起和展开的效果
思路
就是 自定义Header 在它上面添加一个Button 或者一个点击手势 ，我是添加了一个手势
每一个分区设置一个状态为表示为收起和展开 (bool 型 即可)
当判断为收起时将分区 section的row数量设置为0，即不显示任何内容
当判断为展开时将分区 section的row数量设置为要显示的内容的数目
然后重载分区即可
重载分区方法
1 //重载分区 2 [_tableV reloadSections:[NSIndexSet indexSetWithIndex:section] withRowAnimation:UITableViewRowAnimationFade];
问题与解答
遇到的一个问题是，本来以为自定义了Header后，可以不设置Header的高度即可，但是其实是不行的，如果不设置header的高度，第一个分区 section的header将不会显示，所以，必须给section设置一个高度
code：
AppDelegate代码
1 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
2
3 self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
4 self.window.backgroundColor = [UIColor whiteColor];
5 RootViewController * root = [[RootViewController alloc]init];
6 UINavigationController * una = [[UINavigationController alloc]initWithRootViewController:root];
7 self.window.rootViewController = una;
8
9 [self.window makeKeyAndVisible];
10
11 return YES;
12 }
ViewController.m代码
1 #import "RootViewController.h"
2
3 @interface RootViewController ()
4
5 @end
6
7 @implementation RootViewController
8 {
9 UITableView * _tableV;
10 NSMutableArray * _dataArr; //cell 元数据 貌似没什么用
11 NSMutableDictionary * _numDict; //记录分区收起 与 展开的状态
12 }
13
14 - (void)viewDidLoad
15 {
16 [super viewDidLoad];
17
18
19 [self createData];
20
21 [self createTableView];
22 }
23
24 #pragma mark 创建UITableView
25 -(void)createTableView
26 {
27 _tableV = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height) style:UITableViewStyleGrouped];
28 _tableV.separatorStyle = UITableViewCellSeparatorStyleSingleLine;
29 _tableV.delegate = self;
30 _tableV.dataSource = self;
31 [self.view addSubview:_tableV];
32 }
33
34 #pragma mark 初始化数据
35 -(void)createData
36 {
37 _dataArr = [[NSMutableArray alloc] init];
38 for (NSInteger i = 0; i<10; i++)
39 {
40 NSString * str = [NSString stringWithFormat:@"data %ld",i];
41 [_dataArr addObject:str];
42 }
43
44 _numDict = [[NSMutableDictionary alloc] init];
45 for (NSInteger i = 0; i<10; i++)
46 {
47 NSNumber * num = [[NSNumber alloc] initWithBool:YES];
48 NSString * str = [NSString stringWithFormat:@"%ld",i];
49
50 [_numDict setObject:num forKey:str];
51 }
52 }
53
54
55
56
57 #pragma mark 协议方法
58 //num of row in section
59 -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
60 {
61 NSString * str = [NSString stringWithFormat:@"%ld",section];
62 if ([_numDict[str] boolValue] == YES)
63 {
64 return _dataArr.count;
65 }
66 else
67 return 0;
68 }
69
70 //set cell
71 -(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
72 {
73 static NSString * str = @"cell";
74 UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:str];
75 if (!cell)
76 {
77 cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:str];
78 }
79 cell.textLabel.text = [NSString stringWithFormat:@"cell section %ld row%ld",indexPath.section,indexPath.row];
80 cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
81 return cell;
82 }
83
84 -(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
85 {
86 return 4;
87 }
88 #pragma mark 重要 刚开始第一个 section的 自定义header不显示，因为没有设置header 的高度 height
89
90 -(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
91 {
92 return 40;
93 }
94 //height for row
95 -(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
96 {
97 return 50;
98 }
99
100 #pragma mark 本工程重点 自定义header of cell实现
101
102 -(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
103 {
104
105
106 NSString * str = [NSString stringWithFormat:@"%ld",section];
107 NSLog(@"%@",str);
108 UIView * view = [[UIView alloc] init];
109 view.backgroundColor = [UIColor blueColor];
110 view.frame = CGRectMake(0, 0, 320, 40);
111 view.alpha = 0.3;
112
113
114 UIImageView * imageV = [[UIImageView alloc] init];
115 imageV.userInteractionEnabled = YES;
116 imageV.frame = CGRectMake(10, 5, 30, 30);
117 if ([_numDict[str] boolValue] == YES)
118 {
119 imageV.image = [UIImage imageNamed:@"arrow_fold.png"];
120 }
121 else
122 imageV.image = [UIImage imageNamed:@"arrow_spread.png"];
123
124 view.tag = section + 10;
125 NSLog(@"view tag %ld",view.tag);
126 [view addSubview:imageV];
127
128 UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapView:)];
129
130 tap.numberOfTapsRequired = 1;
131
132 tap.numberOfTouchesRequired = 1;
133
134 //添加手势
135 [view addGestureRecognizer:tap];
136
137 return view;
138 }
139
140
141 -(void)tapView:(UITapGestureRecognizer*)tap
142 {
143 NSInteger section = tap.view.tag - 10;
144 NSLog(@"tapview section %ld",section);
145 NSString * str = [NSString stringWithFormat:@"%ld",section];
146 BOOL ret = [_numDict[str] boolValue];
147 ret = !ret;
148 [_numDict setObject:[NSNumber numberWithBool:ret] forKey:str];
149
150 //重载分区
151 [_tableV reloadSections:[NSIndexSet indexSetWithIndex:section] withRowAnimation:UITableViewRowAnimationFade];
152 }
153
154
155 -(CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
156 {
157 return 1;
158 }
159 - (void)didReceiveMemoryWarning {
160 [super didReceiveMemoryWarning];
161 // Dispose of any resources that can be recreated.
162 }
163
164 /*
165 #pragma mark - Navigation
166
167 // In a storyboard-based application, you will often want to do a little preparation before navigation
168 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
169 // Get the new view controller using [segue destinationViewController].
170 // Pass the selected object to the new view controller.
171 }
172 */
173
174 @end
时间： 2024-10-12 09:03:04