逍遙文工作室

過去我所想的點子，只要偵測到iBeacon就進行對應事件。這次幫朋友阿強實現點子，發現同一UUID的iBeacon，只會觸發一次didEnter和didExit，用圖示來說明比較清楚～

可以看到兩顆iBeacon重疊偵測範圍，只要偵測到其中一顆，就只會觸發一次didEnter和didExit。這與Android測試得到的結果不同，iOS已經幫我們處理好，再把處理過的結果回傳給開發者使用，這是限制也是方便～

Android會觸發兩次（每顆iBeacon各一次），可能也叫做didEnter和didExit。阿強測試比較過後，發現iOS偵測速度比Android慢，這其實是因為iOS SDK會有數秒鐘偵測週邊iBeacon並處理。

於是研究如何實現各別觸發didEnter和didExit，結論就是設定不同的Region ID，範例：

/**
 Theme: iBeacon Detect Many Regions
 IDE: Xcode 9
 Language: Objective C
 Date: 107/07/14
 Author: HappyMan
 Blog: https://cg2010studio.com/
 */
-(void)setupService
{
    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;
    [self.locationManager requestAlwaysAuthorization];
    
    // Create a NSUUID with the same UUID as the broadcasting beacon
    NSUUID *uuid = [[NSUUID alloc] initWithUUIDString:@"fda50693-a4e2-4fb1-afcf-c6eb07647825"];
    NSUUID *uuid2 = [[NSUUID alloc] initWithUUIDString:@"fda50693-a4e2-4fb1-afcf-c6eb07647826"];
    
    // Setup a new region with that UUID and same identifier as the broadcasting beacon
    self.myBeaconRegion = [[CLBeaconRegion alloc] initWithProximityUUID:uuid
                                                             identifier:@"com.happy.beacon"];
    self.myBeaconRegion.notifyEntryStateOnDisplay = YES;
    self.myBeaconRegion.notifyOnExit = YES;
    self.myBeaconRegion.notifyOnEntry = YES;
    
    self.myBeaconRegion2 = [[CLBeaconRegion alloc] initWithProximityUUID:uuid2
                                                              identifier:@"com.happy.beacon2"];
    self.myBeaconRegion2.notifyEntryStateOnDisplay = YES;
    self.myBeaconRegion2.notifyOnExit = YES;
    self.myBeaconRegion2.notifyOnEntry = YES;
    
    // Tell location manager to start monitoring for the beacon region
    [self.locationManager startMonitoringForRegion:self.myBeaconRegion];
    [self.locationManager startRangingBeaconsInRegion:self.myBeaconRegion];
    [self.locationManager startMonitoringForRegion:self.myBeaconRegion2];
    [self.locationManager startRangingBeaconsInRegion:self.myBeaconRegion2];
}

另繪製如圖所示：

我在App前景做測試，會不斷觸發此API：

-(void)locationManager:(CLLocationManager*)manager

       didRangeBeacons:(NSArray*)beacons

              inRegion:(CLBeaconRegion*)region

無論beacons是否有東西，經Log觀察到，每個Region每一秒都會觸發此API。

Printing description of beacons:

<__NSArrayM 0x111dde450>(

CLBeacon (uuid:FDA50693-A4E2-4FB1-AFCF-C6EB07647825, major:10034, minor:61715, proximity:1 +/- 0.09m, rssi:-40)

)

Printing description of region:

CLBeaconRegion (identifier:’com.happy.beacon2′, uuid:FDA50693-A4E2-4FB1-AFCF-C6EB07647826, major:(null), minor:(null))

Printing description of region:

CLBeaconRegion (identifier:’com.happy.beacon’, uuid:FDA50693-A4E2-4FB1-AFCF-C6EB07647825, major:(null), minor:(null))

將兩個iBeacon放在房間（一個是iPhone 6s+模擬，一個是真的iBeacon裝置），我走出去門外20公尺，再走回來房間，在螢幕暗掉情況下測試～

結果就如同網路高人指點那樣：）～

參考：iBeacon detection rate on iOS、Is it possible to use beacon ranging in the background?。