1.思路
1.返回自定义的headerView
2.定时器每秒刷新
3.获得可视的headerView的IndexPath数组
4.遍历IndexPath数组
5.通过IndexPath获得指定的headerView
6.修改headerView的控件内容
2.自定义的headerView
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{
HeaderView *headerView = [[HeaderView alloc] init];
return headerView;
}
@interface HeaderView : UITableViewHeaderFooterView
@property(nonatomic,weak,readonly) UILabel *label;
@end
3.定时器每秒刷新
self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateTableView) userInfo:nil repeats:YES];
//异步刷新
[[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];
4.headerView处理
- (void)updateTableView{
NSArray<NSIndexPath *> *indexPathArr = [self.tableView indexPathsForVisibleRows];
self.index++;
for (NSIndexPath *indexPath in indexPathArr) {
HeaderView *headerView = (HeaderView *)[self.tableView headerViewForSection:indexPath.section];
headerView.label.text = [NSString stringWithFormat:@"%d",self.index];
}
}
