Question

我显然在这里缺少一些基本的东西。我正忙着一个监控重要位置变化的应用程序。我运行应用程序。然后完全关闭它，我的委托中的didUpdateLocations在必要时被触发，但我的位置是零。

- (void)locationManager:(CLLocationManager *)manager
     didUpdateLocations:(NSArray *)locations {
    NSLog(@"didUpdateLocations: %@", [locations lastObject]);
    CLLocation* location = [locations lastObject];
    NSLog(@"latitude %+.6f, longitude %+.6f\n",
          location.coordinate.latitude,
          location.coordinate.longitude); 
}

任何想法/帮助？

由于

Answer 1

将此添加到您的plist

<key>NSLocationAlwaysUsageDescription</key>
<string></string>
<key>NSLocationWhenInUseUsageDescription</key>
<string></string>

这段代码

#define IS_OS_8_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)


    if(IS_OS_8_OR_LATER) {
            [locationManager requestAlwaysAuthorization];
        }

Answer 2

在iOS 9中，这就是我所做的，我在plist中添加了：

<key>NSLocationAlwaysUsageDescription</key>
<string>Location is required to find out where you are</string>

在课堂上使用核心位置管理器

 - (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {

     BOOL isInBackground = NO;
    if ([UIApplication sharedApplication].applicationState == UIApplicationStateBackground)
    {
        isInBackground = YES;
    }

    if (isInBackground) {
        // Do something while in the background
    } else {
        // while in use
    }

 }

在代表中，我开始监控重要的位置服务

- (void)applicationDidEnterBackground:(UIApplication *)application {
    NSLog(@"App going to the background");
    [_locationManager startMonitoringSignificantLocationChanges];
}

iOS重要位置更改和didUpdateLocations

2 个答案: