4.14 Displaying a Refresh Control for Table Views-优快云博客

本文详细解释了列表刷新的工作原理及实现方式，包括创建刷新控制组件、实现刷新方法和注意事项。特别关注了在不同场景下（如UITableViewController与UIViewController）实现列表刷新的不同之处。

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列表的刷新
列表一般都是怎么刷新的呢，一般都是往下狠狠拽一下是不是，然后就出来一个转转转的表示正在刷新，刷新完恢复。这是怎么实现的呢？
很简单，比你想象的要简单

首先声明创建下这个装转转的东西（书上源码）
self.refreshControl = [[UIRefreshControl alloc] init];
self.refreshControl = self.refreshControl;
[self.refreshControl addTarget:self
action:@selector(handleRefresh:)
forControlEvents:UIControlEventValueChanged];

实现下刷新方法（书上源码）
- (void) handleRefresh:(id)paramSender{
/* Put a bit of delay between when the refresh control is released
and when we actually do the refreshing to make the UI look a bit
smoother than just doing the update without the animation */
int64_t delayInSeconds = 1.0f;
dispatch_time_t popTime =
dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
/* Add the current date to the list of dates that we have
so that when the table view is refreshed, a new item will appear
on the screen so that the user will see the difference between
the before and the after of the refresh */
[self.times addObject:[NSDate date]];//修改数据源
[self.refreshControl endRefreshing];
[self.tableView reloadData];
});
}