xcode iphone CLLocationmanager 区域监控回调未触发
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iphone CLLocationmanager Region monitoring callbacks not triggered
提问by tzl
I am trying to use monitoring regions to track if users have visited landmarks. the location manager is initialized in a viewcontroller along with a mapkit
我正在尝试使用监控区域来跟踪用户是否访问过地标。位置管理器与 mapkit 一起在 viewcontroller 中初始化
in viewdidload of the view controller:
在视图控制器的 viewdidload 中：
if (self.locationManager == nil)
{
// NSLog(@"creating location manager");
self.locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
locationManager.distanceFilter = kCLDistanceFilterNone;
}
NSSet* set=[locationManager monitoredRegions];
if ([CLLocationManager regionMonitoringAvailable] && [CLLocationManager regionMonitoringEnabled]) {
NSLog(@"region monitoring okay");
NSLog(@"monitored regions: %@",set);
}
i get the NSLogs "region monitoring okay" and all the regions correctly.
我正确地得到了 NSLogs“区域监控正常”和所有区域。
adding of the regions are done like so
区域的添加是这样完成的
double metres=20.0;
CLLocationDistance dist=metres;
CLLocationAccuracy acc=1.0;
CLRegion *reg=[[CLRegion alloc] initCircularRegionWithCenter:coordinate radius:dist identifier:landmarkObj.landmarkName];
[locationManager startMonitoringForRegion:reg desiredAccuracy:acc];
but the callbacks are all not triggered
但回调都没有触发
- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Entered"
message:region.identifier
delegate:self
cancelButtonTitle:@"OK"
otherButtonTitles:nil, nil];
[alert show];
}
- (void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Exited"
message:region.identifier
delegate:self
cancelButtonTitle:@"OK"
otherButtonTitles:nil, nil];
[alert show];
}
- (void)locationManager:(CLLocationManager *)manager didStartMonitoringForRegion:(CLRegion *)region
{
NSLog(@"started monitring for region: %@",region);
}
- (void) locationManager:(CLLocationManager *)manager monitoringDidFailForRegion:(CLRegion *)region withError:(NSError *)error
{
NSLog(@"%@",error);
}
updating the location however, works fine.
但是，更新位置可以正常工作。
[locationManager startUpdatingLocation];
triggers the callback didUpdateToLocation as expected
按预期触发回调 didUpdateToLocation
Update: used didUpdatToLocation to monitor for regions instead. still interested to know why this would not work though, looks like few have had success with region monitoring
更新：改为使用 didUpdatToLocation 来监视区域。仍然有兴趣知道为什么这不起作用，看起来很少有人在区域监控方面取得成功
采纳答案by chadbag
the region tracking stuff is for low granularity position tracking and is triggered on cell location boundaries, so if you don't cross a cell boundary, you will never get your regions checked. I had the same issues and researched this and a different website had a comment about this which pointed to this apple forum:
区域跟踪内容用于低粒度位置跟踪并在单元格位置边界上触发，因此如果您不跨越单元格边界，您将永远不会检查您的区域。我遇到了同样的问题并对此进行了研究，一个不同的网站对此发表了评论，指向这个苹果论坛：
https://devforums.apple.com/message/251046#251046
https://devforums.apple.com/message/251046#251046
If you read all the comments you will understand why this is not working.
如果您阅读了所有评论，您就会明白为什么这不起作用。
I am trying a work around where I define my own NSSets to contain tracked CLRegions and occupied CLRegions and then when I get a locationManager:didUpdateToLocation:fromLocation: callback, I check all the regions in my tracked set to see if I was NOT in the inRegions set but now am in the tracked region (add to inRegions and call back with enterRegion) or if I was inRegion but now am not (remove from inRegions and call back with exitRegion). It is a work in progress now.
我正在尝试解决我定义自己的 NSSets 以包含跟踪的 CLRegions 和占用的 CLRegions，然后当我获得 locationManager:didUpdateToLocation:fromLocation: 回调时，我检查我的跟踪集中的所有区域以查看我是否不在inRegions 设置但现在在跟踪区域中（添加到 inRegions 并使用 enterRegion 回调）或者如果我是 inRegion 但现在不是（从 inRegions 中删除并使用 exitRegion 回调）。这是一项正在进行的工作。
回答by Dave Cole
You also need NSLocationAlwaysUsageDescription in your plist, and need to call [locationManager requestAlwayAuthorization] in your app. NSLocationWhenInUseUsageDescription will turn off region monitoring.
您还需要在 plist 中使用 NSLocationAlwaysUsageDescription，并且需要在您的应用中调用 [locationManager requestAlwayAuthorization]。NSLocationWhenInUseUsageDescription 将关闭区域监控。
回答by SentineL
did you set CLLocationManagerDelegateto your ViewController?
你设置CLLocationManagerDelegate为你的 ViewController 吗？
@interface Maps : UIViewController <CLLocationManagerDelegate>{
...
}
回答by Edson Araujo
Try use the Debug -> Location -> Freewaydrive for simulation, I have a similiar problem, but I created a few regions and the didEnterRegion is trigged with more than 1.000 meters... I don't know Way.. I have set:
尝试使用Debug -> Location -> Freewaydrive 进行模拟，我有一个类似的问题，但我创建了一些区域，didEnterRegion 被触发超过 1.000 米......我不知道 Way.. 我已经设置：
locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
locationManager.distanceFilter = kCLDistanceFilterNone;
回答by Bill Burgess
What are you putting for your center coordinate? That part is missing from your example. I have seen other examples where they are are not filling it with a precise enough coordinate combined with the radius of the region for it to ever trigger. You have to have a pretty precise coordinate entered (probably 5 or 6 decimals) if you want to trigger at a 20 meter radius.
你的中心坐标是什么？您的示例中缺少该部分。我见过其他例子，他们没有用足够精确的坐标填充它，并结合区域的半径来触发它。如果您想在 20 米半径内触发，您必须输入非常精确的坐标（可能是 5 或 6 位小数）。
Everything else looks pretty good.
其他一切看起来都不错。
