ios - CLRegion 后台监控未发生

Question

在我的项目设置 > 目标 > 功能中，我打开了后台模式并选中了“位置更新”。

应用委托(delegate)

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    self.storyController = [StoryController sharedController];
    self.storyController.locationManager.delegate = self;

 ... etc initializing VC ...

- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region {
    NSLog(@"entered region, %@", region.identifier);
    [self handleRegionEvent:region];
}

- (void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region {
    NSLog(@"exited region, %@", region.identifier);
    [self handleRegionEvent:region];
}

- (void)handleRegionEvent:(CLRegion *)region {
    NSLog(@"handle region");
    if ([UIApplication sharedApplication].applicationState ==
        UIApplicationStateActive) {
        NSLog(@"handle region local");
        UILocalNotification *n = [[UILocalNotification alloc] init];
        n.alertBody = @"LOCAL";
        n.soundName = @"Default"; //Coffee Man?
        [[UIApplication sharedApplication] presentLocalNotificationNow:n];
    } else {
        if ([[StoryController sharedController] readyForNextChapter]) {
            UILocalNotification *n = [[UILocalNotification alloc] init];
            n.alertBody = @"New ☕ Story";
            n.soundName = @"Default"; //Coffee Man?
            [[UIApplication sharedApplication] presentLocalNotificationNow:n];
        }
    }
}

故事 Controller

+ (id)sharedController {
    static StoryController *myController = nil;
    static dispatch_once_t token;
    dispatch_once(&token, ^{
        myController = [[StoryController alloc] init];
    });

    return myController;
}

- (id)init {
    self = [super init];
    self.locationManager = [[CLLocationManager alloc] init];
    NSLog(@"monitored regions: %@", self.locationManager.monitoredRegions);

稍后我将监视该区域:

CLCircularRegion *region = [[CLCircularRegion alloc] initWithCenter:g.coordinate radius:1000 identifier:"My Store"];
region.notifyOnEntry = true;
region.notifyOnExit = true;

NSLog(@"%d", [CLLocationManager authorizationStatus]);
[[[StoryController sharedController] locationManager] startMonitoringForRegion:region];

当我在后台运行应用程序时离开或进入 1 公里范围时，我没有收到任何通知。

我如何使它起作用？当我注销我的监控区域时，我确实看到经纬度是正确的。

Answer 1

您需要确保自己在做两件事。

1. 检查区域监控的可用性

2. 确保您的 locationManager.authorizationStatus == .authorizedAlways

有些系统根本不支持区域监控，除非你的authorizationStatus为.authorizedAlways，否则区域监控永远不会工作，只有这样它才能在后台监控。

https://developer.apple.com/library/content/documentation/UserExperience/Conceptual/LocationAwarenessPG/RegionMonitoring/RegionMonitoring.html