iOS8中使用CoreLocation定位

深碍√TFBOYSˉ_ 2022-08-06 00:29 157阅读 0赞

在iOS8中，苹果已经强制开发者在请求定位服务时获得用户的授权，此外iOS状态栏中还有指示图标，提示用户当前应用是否正在使用定位服务。另外在iOS8中，苹果进一步改善了定位服务，让开发者请求定位服务时需要向用户提供更多的透明。此外，iOS8中还支持让应用开发者调用全新的“访问监控”功能，当用户允许后应用才能获得更多的定位数据。

![ios8\_location\_alert.png][ios8_location_alert.png]

## iOS8以前使用CoreLocation定位 ##

1、首先定义一个全局的变量用来记录CLLocationManager对象，引入`CoreLocation.framework`使用`#import <CoreLocation/CoreLocation.h>`

2、初始化CLLocationManager并开始定位

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    <div style="padding:0px!important; margin:0px!important; border:0px!important; bottom:auto!important; float:none!important; left:auto!important; line-height:1.1em!important; outline:0px!important; overflow:visible!important; position:relative!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-size:1em!important; min-height:inherit!important"> 
     <div style="white-space:nowrap; padding:0px 1em!important; margin:0px!important; border:0px!important; bottom:auto!important; float:none!important; left:auto!important; line-height:1.1em!important; outline:0px!important; overflow:visible!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-size:1em!important; min-height:inherit!important"> 
      <code style="padding:0px!important; margin:0px!important; border:0px!important; bottom:auto!important; float:none!important; left:auto!important; line-height:1.1em!important; outline:0px!important; overflow:visible!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; min-height:inherit!important">self.locationManager&nbsp;=&nbsp;[[CLLocationManager&nbsp;alloc]init];</code> 
     </div> 
     <div style="white-space:nowrap; padding:0px 1em!important; margin:0px!important; border:0px!important; bottom:auto!important; float:none!important; left:auto!important; line-height:1.1em!important; outline:0px!important; overflow:visible!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-size:1em!important; min-height:inherit!important"> 
      <code style="padding:0px!important; margin:0px!important; border:0px!important; bottom:auto!important; float:none!important; left:auto!important; line-height:1.1em!important; outline:0px!important; overflow:visible!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; min-height:inherit!important">_locationManager.delegate&nbsp;=&nbsp;self;</code> 
     </div> 
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      <code style="padding:0px!important; margin:0px!important; border:0px!important; bottom:auto!important; float:none!important; left:auto!important; line-height:1.1em!important; outline:0px!important; overflow:visible!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; min-height:inherit!important">_locationManager.desiredAccuracy&nbsp;=&nbsp;kCLLocationAccuracyBest;</code> 
     </div> 
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      <code style="padding:0px!important; margin:0px!important; border:0px!important; bottom:auto!important; float:none!important; left:auto!important; line-height:1.1em!important; outline:0px!important; overflow:visible!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; min-height:inherit!important">_locationManager.distanceFilter&nbsp;=&nbsp;10;</code> 
     </div> 
     <div style="white-space:nowrap; padding:0px 1em!important; margin:0px!important; border:0px!important; bottom:auto!important; float:none!important; left:auto!important; line-height:1.1em!important; outline:0px!important; overflow:visible!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-size:1em!important; min-height:inherit!important"> 
      <code style="padding:0px!important; margin:0px!important; border:0px!important; bottom:auto!important; float:none!important; left:auto!important; line-height:1.1em!important; outline:0px!important; overflow:visible!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; min-height:inherit!important">[_locationManager&nbsp;startUpdatingLocation];</code> 
     </div> 
    </div> </td> 
  </tr> 
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</table>

3、实现CLLocationManagerDelegate的代理方法

(1)获取到位置数据，返回的是一个CLLocation的数组，一般使用其中的一个

<table style="padding:0px; margin:0px auto 10px; font-size:12px; border-collapse:collapse; color:rgb(80,80,80); font-family:宋体,'Arial Narrow',arial,serif; width:718px"> 
 <tbody style="padding:0px; margin:0px; border:0px; font-family:inherit; font-style:inherit; font-variant:inherit; line-height:inherit; vertical-align:baseline"> 
  <tr style="padding:0px; margin:0px; border:0px; font-family:inherit; font-style:inherit; font-variant:inherit; line-height:inherit; vertical-align:baseline"> 
   <td style="padding:0px; margin:0px; border:0px; font-family:inherit; font-style:inherit; font-variant:inherit; line-height:inherit; vertical-align:middle"> <br style="padding:0px; margin:0px"> </td> 
   <td style="padding:0px; margin:0px; border:0px; font-family:inherit; font-style:inherit; font-variant:inherit; line-height:inherit; vertical-align:middle"> <pre style="padding:0px; margin-top:0px; margin-bottom:1em; font-family:Menlo,Monaco,'Andale Mono','lucida console','Courier New',monospace; font-size:13px; overflow:auto; width:728.625px; border:none; font-style:inherit; font-variant:inherit; line-height:1.45em; vertical-align:baseline; color:rgb(147,161,161); background-color:rgb(247,247,247)">-&nbsp;(void)locationManager:(CLLocationManager&nbsp;*)manager&nbsp;didUpdateLocations:(NSArray&nbsp;*)locations
{&nbsp;&nbsp;&nbsp;
&nbsp;CLLocation&nbsp;*currLocation&nbsp;=&nbsp;[locations&nbsp;lastObject];&nbsp;&nbsp;&nbsp;&nbsp;
NSLog(@"经度=%f&nbsp;纬度=%f&nbsp;高度=%f",&nbsp;currLocation.coordinrdinate.longitude,&nbsp;currLocation.altitude);
}</pre> </td> 
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(2)获取用户位置数据失败的回调方法，在此通知用户

<table style="padding:0px; margin:0px auto 10px; font-size:12px; border-collapse:collapse; color:rgb(80,80,80); font-family:宋体,'Arial Narrow',arial,serif"> 
 <tbody style="padding:0px; margin:0px; border:0px; font-family:inherit; font-style:inherit; font-variant:inherit; line-height:inherit; vertical-align:baseline"> 
  <tr style="padding:0px; margin:0px; border:0px; font-family:inherit; font-style:inherit; font-variant:inherit; line-height:inherit; vertical-align:baseline"> 
   <td style="padding:0px; margin:0px; border:0px; font-family:inherit; font-style:inherit; font-variant:inherit; line-height:inherit; vertical-align:middle"> <br style="padding:0px; margin:0px"> </td> 
   <td style="padding:0px; margin:0px; border:0px; font-family:inherit; font-style:inherit; font-variant:inherit; line-height:inherit; vertical-align:middle"> <pre style="padding:0px; margin-top:0px; margin-bottom:1em; font-family:Menlo,Monaco,'Andale Mono','lucida console','Courier New',monospace; font-size:13px; overflow:auto; width:667.25px; border:none; font-style:inherit; font-variant:inherit; line-height:1.45em; vertical-align:baseline; color:rgb(147,161,161); background-color:rgb(247,247,247)">-&nbsp;(void)locationManager:(CLLocationManager&nbsp;*)manager&nbsp;didFailWithError:(NSError&nbsp;*)error
{&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([error&nbsp;code]&nbsp;==&nbsp;kCLErrorDenied)&nbsp;&nbsp;&nbsp;
&nbsp;{&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//访问被拒绝&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;if&nbsp;([error&nbsp;code]&nbsp;==&nbsp;kCLErrorLocationUnknown)&nbsp;
&nbsp;&nbsp;{&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//无法获取位置信息&nbsp;&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;}</pre> </td> 
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 </tbody> 
</table>

4、在`viewWillDisappear`关闭定位

<table style="padding:0px; margin:0px auto 10px; font-size:12px; border-collapse:collapse; color:rgb(80,80,80); font-family:宋体,'Arial Narrow',arial,serif; width:718px"> 
 <tbody style="padding:0px; margin:0px; border:0px; font-family:inherit; font-style:inherit; font-variant:inherit; line-height:inherit; vertical-align:baseline"> 
  <tr style="padding:0px; margin:0px; border:0px; font-family:inherit; font-style:inherit; font-variant:inherit; line-height:inherit; vertical-align:baseline"> 
   <td style="padding:0px; margin:0px; border:0px; font-family:inherit; font-style:inherit; font-variant:inherit; line-height:inherit; vertical-align:middle"> <br style="padding:0px; margin:0px"> </td> 
   <td style="padding:0px; margin:0px; border:0px; font-family:inherit; font-style:inherit; font-variant:inherit; line-height:inherit; vertical-align:middle"> <pre style="padding:0px; margin-top:0px; margin-bottom:1em; font-family:Menlo,Monaco,'Andale Mono','lucida console','Courier New',monospace; font-size:13px; overflow:auto; width:708.828125px; border:none; font-style:inherit; font-variant:inherit; line-height:1.45em; vertical-align:baseline; color:rgb(147,161,161); background-color:rgb(247,247,247)">-&nbsp;(void)viewWillDisappear:(BOOL)animated{&nbsp;&nbsp;
&nbsp;&nbsp;[super&nbsp;viewWillDisappear:animated];&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;[_locationManager&nbsp;stopUpdatingLocation];
&nbsp;&nbsp;&nbsp;&nbsp;}</pre> </td> 
  </tr> 
 </tbody> 
</table>

## iOS8中使用CoreLocation定位 ##

1、在使用CoreLocation前需要调用如下函数【iOS8专用】：

iOS8对定位进行了一些修改，其中包括定位授权的方法，CLLocationManager增加了下面的两个方法：

（1）始终允许访问位置信息

`- (void)requestAlwaysAuthorization;`

（2）使用应用程序期间允许访问位置数据

`- (void)requestWhenInUseAuthorization;`

示例如下：

<table style="padding:0px; margin:0px auto 10px; font-size:12px; border-collapse:collapse; color:rgb(80,80,80); font-family:宋体,'Arial Narrow',arial,serif; width:718px"> 
 <tbody style="padding:0px; margin:0px; border:0px; font-family:inherit; font-style:inherit; font-variant:inherit; line-height:inherit; vertical-align:baseline"> 
  <tr style="padding:0px; margin:0px; border:0px; font-family:inherit; font-style:inherit; font-variant:inherit; line-height:inherit; vertical-align:baseline"> 
   <td style="padding:0px; margin:0px; border:0px; font-family:inherit; font-style:inherit; font-variant:inherit; line-height:inherit; vertical-align:middle"> <br style="padding:0px; margin:0px"> </td> 
   <td style="padding:0px; margin:0px; border:0px; font-family:inherit; font-style:inherit; font-variant:inherit; line-height:inherit; vertical-align:middle"> <pre style="padding:0px; margin-top:0px; margin-bottom:1em; font-family:Menlo,Monaco,'Andale Mono','lucida console','Courier New',monospace; font-size:13px; overflow:auto; width:709.828125px; border:none; font-style:inherit; font-variant:inherit; line-height:1.45em; vertical-align:baseline; color:rgb(147,161,161); background-color:rgb(247,247,247)">self.locationManager&nbsp;=&nbsp;[[CLLocationManager&nbsp;alloc]init];
_locationManager.delegate&nbsp;=&nbsp;self;
_locationManager.desiredAccuracy&nbsp;=&nbsp;kCLLocationAccuracyBest;
_locationManager.distanceFilter&nbsp;=&nbsp;10;
[_locationManager&nbsp;requestAlwaysAuthorization];
//添加这句[_locationManager&nbsp;startUpdatingLocation];</pre> </td> 
  </tr> 
 </tbody> 
</table>

2、在Info.plist文件中添加如下配置：

（1）`NSLocationAlwaysUsageDescription`

（2）`NSLocationWhenInUseUsageDescription`

这两个键的值就是授权alert的描述，示例配置如下\[`勾选Show Raw Keys/Values后进行添加`\]：

![ios8\_location\_info\_plist.png][ios8_location_alert.png][![wKioL1SD39uxLYz3AALsEEiEL6E195.jpg][]][wKioL1SD39uxLYz3AALsEEiEL6E195.jpg]

## [![wKiom1SD34iRkzh-AANtBn50l54602.jpg][]][wKiom1SD34iRkzh-AANtBn50l54602.jpg] ##

[![041405283617635.gif][]][041405283617635.gif 1]

[ios8_location_alert.png]: /images/20220806/e81da3a71e514882be5bacae15e95b77.png
[wKioL1SD39uxLYz3AALsEEiEL6E195.jpg]: /images/20220806/72270e74dd1e4fb38ebcf7de0acb4ae6.png
[wKiom1SD34iRkzh-AANtBn50l54602.jpg]: /images/20220806/fbc7dfe25a984164bfa0557916165aa1.png
[041405283617635.gif]: /images/20220806/a9c8d3a90af348eeb272441c1bd84f59.png
[041405283617635.gif 1]: http://www.itmmd.com/boke.html