延迟UISearchbar解析

问题描述

我的应用程序中有一个UISearchbar.这是一种动态搜索，当用户输入文本时，将通过远程API调用(我认为是通过REST)搜索远程数据库.

I have a UISearchbar in my app. This is a dynamic search and as the user enters text, a remote database is searched via a remote API call (I think it is through REST).

随着用户键入，表视图将动态刷新.我正在使用NSXMLParser解析XML结果.(因此3个委托方法； didStartElement，didEndElement)

The table view gets refreshed dynamically, as the user types. I am using NSXMLParser for parsing the XML results. (so 3 delegate methods; didStartElement, didEndElement)

在某些情况下，结果中显示重复的条目例如如果用户键入了YAH，它将显示YAHOO 3-4次.我不确定为什么.

In some cases, there are duplicate entries shown in the resultse.g. If user has typed YAH, it shows YAHOO 3-4 times. I'm not sure why.

如何减少解析次数，或如何延迟解析，以使它不会要求用户输入/删除的每个字符.

How can I reduce the number of times the parsing is done, or how to delay the parsing, so that it does not make a request for every character entered/deleted by the user.

我认为这可能会解决问题.

This, I am assuming, might fix the problem.

推荐答案

您可以做的一件事是在发送远程API调用之前引入延迟，而不是为每个字符发送一个查询.

One thing you can do is introduce a delay before you send off the remote API call, instead of sending one query for every character.

// Whenever UISearchbar text changes, schedule a lookup
- (void)searchBar:(UISearchBar *)theSearchBar textDidChange:(NSString *)text {
        // cancel any scheduled lookup
        [NSObject cancelPreviousPerformRequestsWithTarget:self];
        // start a new one in 0.3 seconds
        [self performSelector:@selector(doRemoteQuery) withObject:nil afterDelay:0.3];
}

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