我想在每次用户从商店数组中传递一个商店时进行检查，我有超过 20 个商店，因此我编写了一个函数来查找离用户位置最近的 20 个商店并监视它们。名单更新中locationManager: didUpdateLocations，我还将旧的 20 个监控区域替换为新的 20 个最近的商店位置。
问题是locationManager: didEnterRegion当用户进入某个区域时不会定期调用。
我还注意到，当我检查locationManager.monitoredRegions NSSet由于某种原因，那里的区域是错误的（我用它检查过if句子，所以也许它们是正确的，只是更短？）。
如果有人可以检查我的代码并可能注意到我做错了什么，这真的会对我有帮助！
My code:
监视器LocationViewController.m（滚动查看完整代码）：
-(void)getStoresArrays:(NSNotification*)notification
{
//Fetching "allStoresArray"(NSArray of all the stores sent from another class using NSNotificationCenter) and adding it to "allStores"(NSMutableArray)
NSDictionary *storesCategoriesArrays=[notification userInfo];
self.allStores=[storesCategoriesArrays objectForKey:@"allStoresArray"];
//Calling "locationChangeHandler" for monitoring
[self locationChangeHandler];
}
#pragma mark - CLLocationDelegate methods
//Being called when user's location updated
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations
{
//If "allStores"(NSMutableArray) isn't nil - calling "locationChangeHandler" to update monitoring
if (self.allStores!=nil) {
[self locationChangeHandler];
}
}
//Being called when user enters a monitored region
-(void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region
{
NSLog(@"Entered");
}
#pragma mark - Closest stores sorting methods
//Sorting closest stores to the user's location and adding the 20 closest store to "twentyClosestStores"(NSMutableArray)
-(void)sortClosestStores
{
//Sorting "allStores"(NSMutableArray) from the closest "Store" to the furthest.
[self.allStores sortUsingComparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
//Creating "location1"(CLLocation) and "location2"(CLLocation) and initializing each with "obj1"(id) and "obj2"(id) coordinates
CLLocation *location1=[[CLLocation alloc] initWithLatitude:((Store*)obj1).geoPoint.latitude longitude:((Store*)obj1).geoPoint.longitude];
CLLocation *location2=[[CLLocation alloc] initWithLatitude:((Store*)obj2).geoPoint.latitude longitude:((Store*)obj2).geoPoint.longitude];
//Creating "dist1"(float) and setting its value to the distance between "location1"(CLLocation) and the user's location
float dist1 =[location1 distanceFromLocation:self.locationManager.location];
//Creating "dist2"(float) and setting its value to the distance between "location2"(CLLocation) and the user's location
float dist2 = [location2 distanceFromLocation:self.locationManager.location];
//If the distances are equal - the order will stay the same
if (dist1 == dist2) {
return NSOrderedSame;
}
else if (dist1 < dist2) { //If "dist1"(float) is smaller than "dist2"(float) - "dist2"(float) will be before "dist1" in the array
return NSOrderedAscending;
}
else { //else - "dist2"(float) will be before "dist1" in the array
return NSOrderedDescending;
}
}];
//If "twentyClosestStores"(NSMutableArray) is nil
if (self.twentyClosestStores==nil) {
//Initializing "twentyClosestStores"(NSMutableArray)
self.twentyClosestStores=[NSMutableArray array];
}
//If "previousTwentyStores"(NSMutableArray) is nil
if (self.previousTwentyStores==nil) {
//Initializing "previousTwentyStores"(NSMutableArray)
self.previousTwentyStores=[NSMutableArray array];
}
//Setting "previousTwentyStores"(NSMutableArray) to "twentyClosestStores"(NSMutableArray)
self.previousTwentyStores=self.twentyClosestStores;
//Cleaning (reInitializing) "twentyClosestStores"(NSMutableArray)
self.twentyClosestStores=[NSMutableArray array];
//Adding indexes 0-19 of "allStores"(NSMutableArray) (20 closest stores to the user's current location) to "twentyClosestStores"(NSMutableArray)
for (int i = 0; i < 20; i++) {
[self.twentyClosestStores addObject:[self.allStores objectAtIndex:i]];
}
}
#pragma mark - Start/stop monitoring methods
//For updating monitoring
-(void)locationChangeHandler
{
//If "allStores"(NSMutableArray) isn't nil
if (self.allStores!=nil) {
//Finding the 20 closest stores to he user's location and adding it to "twentyClosestStores"(NSMutableArray)
[self sortClosestStores];
//Stop monitoring "previousTwentyStores"(NSMutableArray) (20 closest stores before user's location updated)
[self stopMonitoringStores];
//Start monitoring "twentyClosestStores"(NSMutableArray)
[self startMonitoringClosestStores];
}
}
//Start monitoring "twentyClosestStores"(NSMutableArray)
-(void)startMonitoringClosestStores
{
//If monitoring isn't availible for "CLCircularRegion"
if (![CLLocationManager isMonitoringAvailableForClass:[CLCircularRegion class]]) {
NSLog(@"Monitoring is not available for CLCircularRegion class");
}
//Run on all "twentyClosestStores"(NSMutableArray)'s objects
for (Store *currentStore in self.twentyClosestStores) {
//Creating "region"(CLCircularRegion) and setting it to "currentStore"(Store)'s circular region
CLCircularRegion *region=[currentStore createCircularRegion];
//Start monitoring "region"(CLCircularRegion)
[self.locationManager startMonitoringForRegion:region];
}
}
//Stop monitoring "previousTwentyStores"(NSMutableArray) (20 closest stores before user's location updated)
-(void)stopMonitoringStores
{
//Run on all "previousTwentyStores"(NSMutableArray)'s objects
for (Store *currentStore in self.previousTwentyStores) {
//Creating "region"(CLCircularRegion) and setting it to "currentStore"(Store)'s circular region
CLCircularRegion *region=[currentStore createCircularRegion];
//Stop monitoring "region"(CLCircularRegion)
[self.locationManager stopMonitoringForRegion:region];
}
}
//Finding a store for region
-(Store*)storeForRegion:(CLCircularRegion*)region
{
//Creating "latitude"(CGFloat) and "longtitude"(CGFloat) and setting it to "region"(CLCircularRegion)'s center.latitude/longtitude
CGFloat latitude=region.center.latitude;
CGFloat longtitude=region.center.longitude;
//Run on all "allStores"(NSMutableArray)'s objects
for (Store *currentStore in self.allStores) {
//If "currentStore"(Store)'s latitude and longtitude is equal to "latitude"(CGFloat) and longtitude(CGFloat)
if (currentStore.geoPoint.latitude==latitude&¤tStore.geoPoint.longitude==longtitude) {
//Returning "currentStore"(Store)
return currentStore;
}
}
//Store not found - returning nil
NSLog(@"No store found for this region: %@",[region description]);
return nil;
}
Store.m:
//Creating and returning a "CLCircularRegion" object of the store
-(CLCircularRegion*)createCircularRegion
{
//Creating "region"(CLCircularRegion) and initializing it with current store information (self) and radios of 200m
CLCircularRegion *region=[[CLCircularRegion alloc] initWithCenter:self.geoPoint radius:200 identifier:self.identifier];
//Setting "region"(CLCircularRegion)'s notifyOnEntry to YES
region.notifyOnEntry=YES;
//Returning "region"(CLCircularRegion)
return region;
}
注意：委托方法正在被调用，甚至didEnterRegion:但并不总是出于某种原因。
解决了问题：
（我决定不使用区域监控而是自己做）
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations
{
[self checkIfNearStore]; //Not being called in background
}
-(void)checkIfNearStore
{
for (Store *currentStore in self.allStores) {
if ([currentStore.circularRegion containsCoordinate:self.locationManager.location.coordinate]&¤tStore.alreadySendNotification==NO) {
NSLog(@"Entered: %@",[[self storeForRegion:currentStore.circularRegion] address]);
currentStore.alreadySendNotification=YES;
[self.storesAlreadySentNotifications addObject:currentStore];
}
}
for (Store *currentStore in self.storesAlreadySentNotifications) {
if (![currentStore.circularRegion containsCoordinate:self.locationManager.location.coordinate]) {
currentStore.alreadySendNotification=NO;
}
}
}
非常感谢！
请查看有关的讨论启动区域监控请注意，Apple 表示该区域的值最大为 400，在后续设备上效果最佳。他们还指出，平均可以在 3 到 5 分钟内得到回复。我不确定您如何测试该区域的进入/退出，但可能您没有留出足够的时间通过。
此外，我建议您设置断点来检查监控区域代码中战略点处的 CLLocationManager 属性（当您期望区域更新时）。您可能会考虑清空区域数组（请参阅即：标题如下），然后使用您的自定义代码重新填充它们。我会非常仔细地检查该区域，以确保预期的行为正在发生。
有许多过滤器可以通知 CLLocationManager 位置何时发生重大变化。您应该设置这些值并检查它们是否对更新频率有影响。另请注意我展示的其他属性和方法，包括期望准确度以及启动重大更新的方法。阅读每个内容的讨论，看看它们是否适用于您的用例。尝试在需要时应用更改，以强制设备在适合您的情况时进行更新。
您可能希望使用用户位置对特定 CLCircularRegion 实施定期命中测试。这应该允许您在代码中的预定时间/位置进一步细化位置更新。例如，您可能希望使用精度和距离过滤器来细化用户更新，然后在委托方法中调用针对数组中最近区域的查询。最终效果是，只要设备从最后一个已知位置显着移动，就会强制执行区域状态检查。
我建议您仔细阅读与此相关的讨论开始监控重大位置变化 https://developer.apple.com/library/ios/documentation/CoreLocation/Reference/CLLocationManager_Class/index.html#//apple_ref/occ/instm/CLLocationManager/startMonitoringSignificantLocationChanges方法（您必须使用此方法来解决问题）。 Apple 详细介绍了当应用程序在后台运行时获取更新所需的步骤。基本上，您必须拦截应用程序委托方法中的一个键。幸运的是这个所以问题 https://stackoverflow.com/questions/27742677/how-to-get-location-updates-for-ios-7-and-8-even-when-the-app-is-suspended有示例代码。但在跳转到代码之前，请按照建议查看讨论，因为它会让您更清楚地了解如何掌握此行为。
就像很多问题一样。这个问题需要一些部分答案来解决您需要的功能。首先确保您已检查上面提供的注释，然后尝试其中一些链接以获得特定所需任务的部分答案。
如何禁用使用 -startMonitoringForRegion 注册的任何 CLRegion 对象？ https://stackoverflow.com/questions/7061007/how-can-i-disable-any-clregion-objects-registered-with-startmonitoringforregion#dash-score-16
Namely:
关于如何完善地理围栏的有用回复 https://stackoverflow.com/questions/23866097/ios-geofence-clcircularregion-monitoring-locationmanagerdidexitregion-does-not
地理围栏简化教程 http://shrikar.com/swift-tutorial-corelocation-and-region-monitoring-in-ios-8/
（你用过吗请求始终授权()在位置管理器上？）
我建议您阅读有关方法和属性的讨论，以了解 Apple 的提示。您还应该随意在代码编辑器中按住 cmd 键单击方法和属性，并查看头文件中的注释。这些将提供 Apple 提供的文档或快速帮助中未提供的更多见解。
作为一个简单的例子，以下标题注释似乎与您的目标相关。您可能想要实现并监视注释标题中提到的委托方法和 requestStateForRegion 方法：
/*
* locationManager:didDetermineState:forRegion:
*
* Discussion:
* Invoked when there's a state transition for a monitored region or in response to a request for state via a
* a call to requestStateForRegion:.
*/
@available(iOS 7.0, *)
optional public func locationManager(manager: CLLocationManager, didDetermineState state: CLRegionState, forRegion region: CLRegion)