首先，需要在应用程序中导入CoreLocation框架，并使用CLLocationManager类来进行Beacon检测。然后，需要为CLLocationManager委托设置实现。最后，可以将Beacon区域uuid，major和minor值设置为用于定义要监视的区域。下面是一个示例代码：

import CoreLocation

class BeaconManager : NSObject, CLLocationManagerDelegate {

let locationManager = CLLocationManager()

override init() {
    super.init()

    locationManager.delegate = self
}

func startMonitoringBeaconWithUUID(uuid: String, major: CLBeaconMajorValue, minor: CLBeaconMinorValue) {
    let beaconUUID = UUID(uuidString: uuid)!
    let beaconRegion = CLBeaconRegion(proximityUUID: beaconUUID, major: major, minor: minor, identifier: "MyBeacon")

    locationManager.startMonitoring(for: beaconRegion)
    locationManager.startRangingBeacons(in: beaconRegion)
}

func locationManager(_ manager: CLLocationManager, didEnterRegion region: CLRegion) {
    if region is CLBeaconRegion {
        print("Entered beacon region")
    }
}

func locationManager(_ manager: CLLocationManager, didExitRegion region: CLRegion) {
    if region is CLBeaconRegion {
        print("Exited beacon region")
    }
}

func locationManager(_ manager: CLLocationManager, didRangeBeacons beacons: [CLBeacon], in region: CLBeaconRegion) {
    if beacons.count > 0 {
        let closestBeacon = beacons[0]
        print("Closest beacon: \(closestBeacon.uuid) major: \(closestBeacon.major) minor: \(closestBeacon.minor)")
    }
}

}

//用法 let beaconManager = BeaconManager() beaconManager.startMonitoringBeaconWithUUID(uuid: "B9407F30-F5F8-466E-AFF9-25556B57FE6D", major: 123, minor: 456)