当应用处于活动状态，处于非活动状态并被杀死时，我的应用需要获取用户的位置。当用户的位置靠近商店时，应用程序必须发送本地通知。
我不确定到底发生了什么，但是我无法使我的应用在后台获取位置，并在被杀死时将其唤醒。
我有一个位置管理器（单个，用于whenInUse和Always两种情况），并且在.plist中定义了NSLocationAlwaysUsageDescription和NSLocationWhenInInUseUsageDescription
我正在做的是：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
//The app has been killed/terminated (not in background) by iOS or the user.
if ([launchOptions objectForKey:UIApplicationLaunchOptionsLocationKey]){
_locationManager = [CoreLocationManager sharedInstance];
_locationManager.isAppActive = NO;
_locationManager.locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
_locationManager.locationManager.activityType = CLActivityTypeOtherNavigation;
if ([_locationManager.locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]) {
[_locationManager.locationManager requestAlwaysAuthorization];
}
[_locationManager addLocationManagerDelegate:self];
}
}
- (void)applicationDidBecomeActive:(UIApplication *)application
{
if (_locationManager.locationManager){
_locationManager.isAppActive = YES;
[_locationManager.locationManager stopMonitoringSignificantLocationChanges];
}
_locationManager = [CoreLocationManager sharedInstance];
if ([_locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]) {
[_locationManager.locationManager requestAlwaysAuthorization];
}
if ([_locationManager.locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) {
[_locationManager.locationManager requestWhenInUseAuthorization];
}
[_locationManager addLocationManagerDelegate:self];
[_locationManager.locationManager startUpdatingLocation];
}
- (void)applicationDidEnterBackground:(UIApplication *)application
{
_locationManager.isAppActive = NO;
if (_locationManager.locationManager){
[_locationManager.locationManager stopUpdatingLocation];
[_locationManager.locationManager stopMonitoringSignificantLocationChanges];
}
if ([_locationManager.locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]) {
[_locationManager.locationManager requestAlwaysAuthorization];
}
[_locationManager.locationManager startMonitoringSignificantLocationChanges];
}
我做错什么了吗？我不确定是否绝对需要使用地理围栏，但是对于我已经阅读过的startMonitoringSignificantLocationChanges来说，这已经足够了。
要在后台获取位置，请使用以下代码。每次重新启动后台任务，将使您的应用在后台长时间运行。
要使用此功能，您需要在项目设置中的“功能”中打开“后台模式”，同时打开“后台获取”和“位置更新”。
- (void)applicationDidEnterBackground:(UIApplication *)application {
if ([[UIDevice currentDevice] respondsToSelector:@selector(isMultitaskingSupported)]) { //Check if our iOS version supports multitasking I.E iOS 4
if ([[UIDevice currentDevice] isMultitaskingSupported]) { //Check if device supports mulitasking
UIApplication *application = [UIApplication sharedApplication]; //Get the shared application instance
__block UIBackgroundTaskIdentifier background_task; //Create a task object
background_task = [application beginBackgroundTaskWithExpirationHandler: ^{
[application endBackgroundTask:background_task]; //Tell the system that we are done with the tasks
background_task = UIBackgroundTaskInvalid; //Set the task to be invalid
//System will be shutting down the app at any point in time now
}];
}
}
}
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