如何使用UISearchBar自动完成和建议搜索位置？ [英] How to search for locations using UISearchBar with autocompletion and suggestions?

问题描述

我开发一个应用程序，用户可以在其中搜索兴趣点，选择搜索结果，然后MKMapView将居中到结果坐标。

I am developing an app in which user can search for a point of interests, pick a search result and then the MKMapView will be centered to the result coordinate.

我的问题是如何使自动完成发生？我已经对 MKLocalSearch 和 MKLocalSearchRequest 进行研究，似乎是苹果公司在iOS6.1上的位置搜索API +。但是，我找不到任何自动完成或建议与 MKLocalSearch 和 MKLocalSearchRequest 的例子。是否可以自动完成位置搜索或显示建议列表，就像苹果的地图应用程序？谢谢！

My question is how to make autocompletion happen? I have did research on MKLocalSearch and MKLocalSearchRequest, and it seems that is Apple suggested API for location search on iOS6.1+. However I cannot find any examples with autocompletion or suggestions with MKLocalSearch and MKLocalSearchRequest. Is it possible to autocomplete a location search or display a list of suggestions just like Apple's Maps app? Thanks!

推荐答案

检查此帖子： http://stackoverflow.com/a/20141677/1464327

基本上，您可以发出多个请求。例如，当用户键入时，启动一个定时器，当定时器完成时，发出请求。

Basically, you can make multiple requests. For exemple, when the user types, start a timer, when the timer finishes, make a request. Whenever the user types, cancel the previous timer.

实现 textField：shouldChangeCharactersInRange：replacementString： 。

static NSTimer *_timer = nil;
[_timer invalidate];
_timer = [NSTimer timerWithTimeInterval:1.5 target:self selector:@selector(_search:) userInfo:nil repeats:NO];

然后实现_search方法来请求。

Then implement the _search method to make the request.

MKLocalSearchRequest *request = [[MKLocalSearchRequest alloc] init];
request.region = regionToSearchIn;
request.naturalLanguageQuery = self.textField.text;
MKLocalSearch *localSearch = [[MKLocalSearch alloc] initWithRequest:request];
[localSearch startWithCompletionHandler:^(MKLocalSearchResponse *response, NSError *error) {
    // check for error and process the response
}];

我从来没有实现过这样的东西。我只是告诉我的起点是什么。希望这将给你一些方向。

I've never implemented something like this. I'm just telling what my starting point would be. Hopefully this will give you some direction.

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