调用stopMonitoringForRegion停止重复区域时，是否会同时停止原区域？

Great question—this is a super common gotcha when working with Core Location's Beacon monitoring, so let's break it down clearly.

The short answer: It depends entirely on the identifier property of your CLBeaconRegion objects, not just the major/minor IDs or proximity UUID.

Here's the detailed breakdown:

• Core Location uses the identifier string as the primary way to distinguish between monitored regions. Even if two regions have identical proximity UUID, major, and minor values, if their identifiers are different, the system treats them as two separate, independent monitoring sessions.
• In your case, if you created self.duplicatedRegion with a different identifier than your original region (e.g., original uses "com.yourapp.beacon.primary" and duplicated uses "com.yourapp.beacon.duplicate"), calling [self.locationManager stopMonitoringForRegion:self.duplicatedRegion] will only stop monitoring the duplicated region. Your original region's monitoring will keep running as expected.
• The only scenario where stopping the duplicated region would affect the original is if you copied the identifier too. If both regions share the same identifier, Core Location sees them as the same region—so stopping either one will remove that single monitoring entry from the system, which means both "instances" (but really, it's one logical region to the system) stop being monitored.

A quick way to verify this is to check the list of active monitored regions at any time:

NSArray *activeRegions = [self.locationManager monitoredRegions];
for (CLRegion *region in activeRegions) {
    NSLog(@"Monitored region: %@", region.identifier);
}

If you see both identifiers in the log, they're separate. If only one appears, the system merged them because of the matching identifier.

Pro tip: When creating duplicate regions for testing (like you're doing), always assign a unique identifier to each. It eliminates ambiguity and prevents accidental side effects like stopping your original monitoring session by mistake.

内容的提问来源于stack exchange，提问作者thus