方法整理:4.后台运行GPS (IOS iPhone Object-C)

原文地址：方法整理:4.后台运行GPS (IOS iPhone Object-C)作者：冰狐

当程序切换到后台后仍然开始gps 的方法其实很简单

只需要在 info.plist 里加上 "Required background modes" 这个项

然后添加这个项的1个 item "App registers for location updates"

然后你的app 如果在前台开启了 gps ,切到后台后 依然会持续更新gps 信息

调用代理方法. 

在这里要提醒下, 在后台开启gps会持快速续消耗电池

所以更好的方法是吧 在切换到后台后, 把原来高精度的gps 调用换成低精度的,来增加电池寿命

在 applicationDidEnterBackground 中加入

if ([CLLocationManager significantLocationChangeMonitoringAvailable]) 

        {

            // Stop normal location updates and start significant location change updates for battery efficiency.

            [[GlobalVariables locationManager] stopUpdatingLocation];

            [[GlobalVariables locationManager] startMonitoringSignificantLocationChanges];

        }

        else 

        {

            NSLog(@"Significant location change monitoring is not available.");

        }

在applicationDidBecomeActive 中加入 

     if ([CLLocationManager significantLocationChangeMonitoringAvailable]) 

    {

// Stop significant location updates and start normal location updates again since the app is inthe forefront.

[[GlobalVariables locationManager] stopMonitoringSignificantLocationChanges];

[[GlobalVariables locationManager] startUpdatingLocation];

}

else 

    {

NSLog(@"Significant location change monitoring is not available.");

}