1 /*
2 实现tableview的下拉刷新
3 tableview滑动就会触发这个方法?
4 */
5 -(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
6 {
7 //当tableview下拉到最后一行的时候才触发
8 if (indexPath.row == self.m_data.count - 1) {
9
10 //定义一个UIView
11 UIView *footSpinnerView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 320.0f, 60.0f)];
12
13 //顶一个有刷新图标的view
14 UIActivityIndicatorView *activity = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(130.0f, 0.0f, 60.0f, 60.0f)];
15 activity.color = [UIColor redColor];
16 [activity startAnimating];//启动有刷新图标的view
17
18 footSpinnerView.backgroundColor = [UIColor grayColor];
19 [footSpinnerView addSubview:activity];
20
21 //设置footerview
22 self.myTableView.tableFooterView = footSpinnerView;
23
24 // self.myTableView.tableHeaderView = footSpinnerView;
25
26 dispatch_queue_t queue = dispatch_queue_create("my queue", nil);
27
28 //在后台线程添加数据
29 dispatch_async(queue, ^(void){
30
31 [self.m_data addObject:@"1000"];
32 [self.m_data addObject:@"1001"];
33 [self.m_data addObject:@"1002"];
34 [self.m_data addObject:@"1003"];
35 [self.m_data addObject:@"1004"];
36
37 });
38
39 //添加完数据就重新加载数据
40 dispatch_async(queue, ^(void) {
41
42 sleep(2);
43 dispatch_sync(dispatch_get_main_queue(), ^(void){
44
45 [self.myTableView reloadData];
46 });
47 });
48
49 // [self.myTableView reloadData];
50 dispatch_release(queue);
51 [footSpinnerView release];
52 [activity release];
53 }
54 // else if (indexPath.row == 0) {
55 //
56 // UIView *footSpinnerView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 320.0f, 60.0f)];
57 // UIActivityIndicatorView *activity = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(130.0f, 0.0f, 60.0f, 60.0f)];
58 // activity.color = [UIColor redColor];
59 // [activity startAnimating];
60 //
61 // footSpinnerView.backgroundColor = [UIColor grayColor];
62 // [footSpinnerView addSubview:activity];
63 //
64 // // self.myTableView.tableFooterView = footSpinnerView;
65 //
66 // self.myTableView.tableHeaderView = footSpinnerView;
67 //
68 // dispatch_queue_t queue = dispatch_queue_create("my queue", nil);
69 //
70 // dispatch_async(queue, ^(void){
71 //
72 // [self.m_data insertObject:@"1000" atIndex:0];
73 //// [self.m_data addObject:@"1001"];
74 //// [self.m_data addObject:@"1002"];
75 //// [self.m_data addObject:@"1003"];
76 //// [self.m_data addObject:@"1004"];
77 // // [self.m_data insertObject:[NSArray arrayWithObject:@"01"] atIndex:0];
78 //
79 // });
80 //
81 // dispatch_async(queue, ^(void) {
82 //
83 // sleep(2);
84 // dispatch_sync(dispatch_get_main_queue(), ^(void){
85 //
86 // [self.myTableView reloadData];
87 // [self.myTableView scrollToRowAtIndexPath:[indexPath initWithIndex:3] atScrollPosition:UITableViewScrollPositionNone animated:YES];
88 // });
89 // });
90 //
91 //
92 // dispatch_release(queue);
93 // [footSpinnerView release];
94 // [activity release];
95 // }
96
97 //如果不是最后一行,则把footerview和headerview都设为nil
98 else
99 {
100 self.myTableView.tableFooterView = nil;
101 self.myTableView.tableHeaderView = nil;
102 }
103 }
