Alamofire与谷歌地理编码API [英] Alamofire with google geocoding api

问题描述

在我的一个应用程序中，我需要对地址字符串进行地理编码。起初，我考虑使用 CLGeocoder 。然而，在我尝试之后，我偶然发现了一个我在这个问题。

解决方案是使用Google的Geocoding API。我已经切换到他们，并设法通过具有以下功能让他们工作：

  func startConnection（）{
 self.data = NSMutableData（）
 let urlString =https://maps.googleapis.com/maps/api/geocode/json?address=\(searchBar.text!)&key=MYKEY 
 
 let linkUrl：NSURL = NSURL（string：urlString.stringByAddingPercentEncodingWithAllowedCharacters（NSCharacterSet.URLQueryAllowedCharacterSet（））！）！ 
 let request：NSURLRequest = NSURLRequest（URL：linkUrl）
 let connection：NSURLConnection = NSURLConnection（request：request，delegate：self，startImmediately：false）！ 
 connection.start（）
} 
 
 func连接（连接：NSURLConnection !, didReceiveData数据：NSData！）{
 self.data.appendData（data）
 
 
 func connectionDidFinishLoading（connection：NSURLConnection！）{
 do {
如果让json = try NSJSONSerialization.JSONObjectWithData（data，options：NSJSONReadingOptions.MutableContainers）as？ [String：AnyObject] {
 print（json）
} 
} 
 catch {
 print（error1）
} 
} 
  

这很好用，解决了我用 CLGeocoder 。但是，除了提取位置坐标之外，我还需要使用Google的Timezone API为每个位置提取时区。

使用 NSURLConnection 或 NSURLSession 在我看来有点困难，因为我需要跟踪哪个会话/连接返回。所以，我想有一些使用完成处理程序的解决方案。

我试过使用Alamofire框架（使用Swift 2.0的正确分支）。但是，在这种情况下，似乎使用 request（）函数是错误的。我曾尝试过：

  let parameters = [address：searchBar.text！，key：MYKEY] 
 Alamofire.request（.GET，https://maps.googleapis.com/maps/api/geocode/json，参数：parameters）.responseJSON（options：.AllowFragments）{_，_，JSON in 
 print（JSON）
} 
  

我印的是SUCCESS 。我希望我做错了什么，它可以被修复，因为我真的希望能够使用闭包，而不是委托调用。

我的问题是： p>

1. 是否可以将Alamofire与Google Geocoding API一起使用？
   
2. 如果有，请告诉我我做错了什么？


3. 如果这是不可能的，你可以建议我如何设计一个带有 NSURSession s的系统，或者 NSURLConnection s允许我为每个调用使用完成处理程序而不是代理？

PS我知道我可以使用同步请求，但我真的想避免使用该选项。

更新

有人建议添加 .MutableContainers 作为选项应该使 responseJSON 工作。我尝试了以下代码：

  let apiKey =MYKEY
 var parameters = [key：apiKey， 组件：locality：\（searchBar.text！）] 
 Alamofire.request（.GET，https://maps.googleapis.com/maps/api/geocode/json，参数：参数）.responseJSON（options：.MutableContainers）{one，two，JSON in 
 print（JSON）
} 
  

我打印的所有内容都是SUCCESS。

解决方案

好的，我终于想通了这一点（在@cnoon的帮助下）。返回的值是 Result 类型。我找不到它的文档，但源代码可用这里。

为了检索JSON，可以使用下面的实现：

  Alamofire.request（.GET，https://mapss.googleapis.com/maps/api/geocode/json，parameters：parameters）.responseJSON（options：.MutableContainers）{_，_， JSON in 
 switch JSON {
 
 case .Failure（_，let error）：
 self.error =错误
 break 
 
 case 。成功（让价值）：
 print（value）
 break 
 
} 
} 
  

打印的值是地理编码API响应的正确表示形式。

In one of my apps I need to geocode address string. At first I considered using CLGeocoder. However, after I tried it I stumbled upon a problem which I described in this question.

The solution was to use Google's Geocoding APIs instead. I have now switched to them and managed to get them working by having the following functions:

func startConnection(){
    self.data = NSMutableData()
    let urlString = "https://maps.googleapis.com/maps/api/geocode/json?address=\(searchBar.text!)&key=MYKEY"

    let linkUrl:NSURL = NSURL(string:urlString.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLQueryAllowedCharacterSet())!)!
    let request: NSURLRequest = NSURLRequest(URL: linkUrl)
    let connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: false)!
        connection.start()
}

func connection(connection: NSURLConnection!, didReceiveData data: NSData!){
    self.data.appendData(data)
}

func connectionDidFinishLoading(connection: NSURLConnection!) {
    do {
        if let json = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers) as? [String: AnyObject] {
            print(json)
        }
    }
    catch {
        print("error1")
    }
}

This works great and resolves the problem which I had with CLGeocoder. However, in addition to extracting the coordinates of place, I need to also use Google's Timezone APIs to extract the timezone for each place.

Doing this with the NSURLConnection or NSURLSession seems to me a bit difficult as I would need to keep track of which session/connection returns. So, I would like to have some solution which uses completion handlers.

I have tried using Alamofire framework (using the correct branch for Swift 2.0). However, it seems like request() function is the wrong one to use in this case. I have tried:

let parameters = ["address":searchBar.text!,"key":"MYKEY"]
Alamofire.request(.GET, "https://maps.googleapis.com/maps/api/geocode/json", parameters: parameters).responseJSON(options:.AllowFragments) { _, _, JSON in
            print(JSON)
        }

And all I am getting printed is "SUCCESS". I hope that I am doing something wrong and it can be fixed because I would really like to be able to use closures instead of delegate calls.

My questions are:

1. Is it possible to use Alamofire with Google Geocoding APIs?
2. If so, can you please tell me what am I doing wrong?
3. If it is not possible, can you please suggest me how to design a system with NSURSessions or NSURLConnections which would allow me to use completion handlers for each call instead of delegates?

P.S. I am aware that I can use synchronous requests but I would really like to avoid using that option

Update

It was suggested that adding .MutableContainers as an option should make responseJSON work. I tried the code below:

let apiKey = "MYKEY"
var parameters = ["key":apiKey,"components":"locality:\(searchBar.text!)"]
Alamofire.request(.GET, "https://maps.googleapis.com/maps/api/geocode/json", parameters: parameters).responseJSON(options:.MutableContainers) { one, two, JSON in
    print(JSON)
}

And all I get printed is "SUCCESS".

解决方案

Ok, I have finally figured this out (with the help from @cnoon). The value which is returned is of type Result. I couldn't find documentation for it, but the source code is available here.

In order to retrieve JSON below implementation can be used:

Alamofire.request(.GET, "https://mapss.googleapis.com/maps/api/geocode/json", parameters: parameters).responseJSON(options:.MutableContainers) { _, _, JSON in
    switch JSON {

    case .Failure(_, let error):
        self.error = error
        break

    case .Success(let value):
        print(value)
        break

    }
}

The value printed is the correct representation of response from Geocoding APIs.

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