在后台模式下使用在iOS模拟器中运行的高速公路驱动器/城市

本文介绍了在后台模式下使用在iOS模拟器中运行的高速公路驱动器/城市的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我试图利用iOS模拟器中的选项：debug->高速公路/城市运行，以模拟位置更新。

I am trying to make use of the options within iOS simulator : debug->freeway drive/ city run in order to simulate the location updates.

在我的代码中我正在使用 CLLocationManager 通过以下代码获取位置更新：

In my code I am using CLLocationManager for getting location updates with following code:

- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. locationManager = [[CLLocationManager alloc] init]; locationManager.delegate = self; [locationManager setDesiredAccuracy:kCLLocationAccuracyNearestTenMeters]; [locationManager setDistanceFilter:20]; } -(void)viewWillAppear:(BOOL)animated { [locationManager startUpdatingLocation]; } -(void)locationManager:(CLLocationManager *)lm didUpdateLocations:(NSArray *)locations{ CLLocation *location = [locations lastObject]; NSLog(@"Location returned: %f, %f Accuracy: %f", location.coordinate.latitude, location.coordinate.longitude, location.horizontalAccuracy); }

在我的应用程序上，我从未收到过有关该位置更新的委托回调在后台，我正在模拟器中选择选项。

I am never getting a callback on the delegate for location updates, while my app is in background and i am selecting the option in simulator.

我已为我的应用提供了后台模式以进行位置更新。请让我知道如何精确使用这些功能，或者如果我在这里缺少任何内容。

I have provided my app the background mode for location updates. Please let me know how exactly to use these features or if i am missing anything here.

推荐答案

我终于解决了这个问题。模拟器的选项运行正常，但问题出在 CLLocation 的实现上。

I finally sorted out the problem. The simulator's options are working perfectly fine but it was the implementation of CLLocation which was the problem.

在iOS 8上，除非：

On iOS 8 the location update code will not work unless :

您添加 NSLocationWhenInUseUsageDescription &将 NSLocationAlwaysUsageDescription 添加到plist，其中包含一些将提示用户的字符串值。

You add NSLocationWhenInUseUsageDescription & NSLocationAlwaysUsageDescription to the plist with some string values that will be prompted to user.

您需要添加要求用户许可以使位置代码正常工作：

You need to add ask user's permission for getting the location codes to work:

[self.locationManager requestWhenInUseAuthorization] [self.locationManager requestAlwaysAuthorization]

来自这篇文章。