iphone - 核心位置 didEnterRegion 无效

Question

- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region

仅当对应于实现 CLLocationManagerDelegate 的类的 UIView 处于事件状态时才有效。

如果我更改 View ，它不会触发 didEnterRegion。谁能帮帮我？

我的代码是这样的

- (void)enableRegionMonitoring {
    locationManager = [[CLLocationManager alloc] init];
    [locationManager setDelegate:self];
    CLLocationCoordinate2D myMonLocation = CLLocationCoordinate2DMake(10.766699790955, 76.650101525879);
    CLRegion *myRegion = [[CLRegion alloc]
                         initCircularRegionWithCenter:myMonLocation
                                               radius:100
                                           identifier:@"MyLoc"];
    //NSLog(@"reg=%@",myRegion); 
    // Start monitoring for our CLRegion using best accuracy
    [locationManager startMonitoringForRegion:myRegion
                              desiredAccuracy:kCLLocationAccuracyBest];
}



- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region {
    NSLog(@"Entered Region");

    NSDate *nowx=[NSDate date];


    UILocalNotification *localNotification=[[UILocalNotification alloc]init];
    if (!localNotification)
        return;
    NSDictionary *data = [NSDictionary dictionaryWithObject:@"qw" forKey:@"mykey"];
    [localNotification setUserInfo:data];

    [localNotification setFireDate:nowx];
    [localNotification setTimeZone:[NSTimeZone defaultTimeZone]];
    NSMutableString *message=[[NSMutableString alloc]init];
    message = @"Local Not Triggered By didEnterRegion";
    [localNotification setAlertBody:[nowx description]];
    [localNotification setAlertAction:@"Open App"];
    [localNotification setHasAction:YES];
    [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
}

Answer 1

从您的代码来看，我猜您正在使用 ARC，这取决于您的 Controller / View 层次结构，当您切换到不同的 View 时，您的 View 和 Controller 可能会被释放，发生这种情况时，locationManager 也会被释放。

只需将整个 CLLocationManager 代码移动到您的 AppDelegate 并让 AppDelegate 成为 CLLocationManager 委托(delegate)。在您现在调用“enableRegionMonitoring”的地方，您可以在 AppDelegate 上调用它。即使 ViewController 不再可见，它也会保持事件状态。