iOS13でiBeacon関連項目が一部変更になっていたので、まとめました。

`CLBeaconRegion` のプロパティが変更された

iOS12までは proximityUUID
iOS13からは uuid
※ 名称変更のみ

@available(iOS 13.0, *)
public init(uuid: UUID, identifier: String)

@available(iOS, introduced: 7.0, deprecated: 13.0)
public init(proximityUUID: UUID, identifier: String)

サンプル

var beaconRegion: CLBeaconRegion {
    if #available(iOS 13.0, *) {
        return CLBeaconRegion(uuid: UUID(uuidString: "FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF")!, identifier: "id")
    } else {
        return CLBeaconRegion(proximityUUID: UUID(uuidString: "FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF")!, identifier: "id")
    }
}

`CLBeaconRegion`のプロパティに `beaconIdentityConstraint` が追加された

open class CLBeaconRegion : CLRegion {

    @available(iOS 13.0, *)
    @NSCopying open var beaconIdentityConstraint: CLBeaconIdentityConstraint { get }

    @available(iOS 13.0, *)
    open var uuid: UUID { get }

    @available(iOS, introduced: 7.0, deprecated: 13.0)
    open var proximityUUID: UUID { get }

    @NSCopying open var major: NSNumber? { get }

    @NSCopying open var minor: NSNumber? { get }

    open var notifyEntryStateOnDisplay: Bool
}

`CLBeaconIdentityConstraint` クラス

iOS12までは Ranging は CLBeaconRegion クラスを用いて行っていましたが、
iOS13からはこのクラスを用いて行ってくれってことっぽいです。

@available(iOS 13.0, *)
open class CLBeaconIdentityConstraint : NSObject, NSCopying, NSSecureCoding {

    open var uuid: UUID { get }

    @NSCopying open var __major: NSNumber? { get }

    @NSCopying open var __minor: NSNumber? { get }

    public init(uuid: UUID)

    public init(uuid: UUID, major: CLBeaconMajorValue)

    public init(uuid: UUID, major: CLBeaconMajorValue, minor: CLBeaconMinorValue)
}

@available(iOS 13.0, *)
extension CLBeaconIdentityConstraint {

    public var major: UInt16? { get }

    public var minor: UInt16? { get }
}

具体的には

`CLBeaconRegion` が `CLBeaconIdentityConstraint` で `init` できるようになった

@available(iOS 13.0, *)
public init(beaconIdentityConstraint: CLBeaconIdentityConstraint, identifier: String)

サンプル

var beaconRegion = CLBeaconRegion(beaconIdentityConstraint: CLBeaconIdentityConstraint(uuid: UUID(uuidString: "FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF")!), identifier: "id")

一部のメソッドの引数が `CLBeaconRegion` から `CLBeaconIdentityConstraint` に置き換わった

下記メソッドでは
iOS12までは CLBeaconRegion クラスを引数にしていたが、
iOS13からは CLBeaconIdentityConstraint クラスが引数になった。

`RangingBeacons`

@available(iOS 13.0, *)
open func startRangingBeacons(satisfying constraint: CLBeaconIdentityConstraint)

@available(iOS 13.0, *)
open func stopRangingBeacons(satisfying constraint: CLBeaconIdentityConstraint)

@available(iOS, introduced: 7.0, deprecated: 13.0, message: "Use -startRangingBeaconsSatisfyingConstraint:")
open func startRangingBeacons(in region: CLBeaconRegion)

@available(iOS, introduced: 7.0, deprecated: 13.0, message: "Use -stopRangingBeaconsSatisfyingConstraint:")
open func stopRangingBeacons(in region: CLBeaconRegion)

サンプル

func startRangingBeacons() {
    if #available(iOS 13.0, *) {
        locationManager.startRangingBeacons(satisfying: beaconRegion.beaconIdentityConstraint)
    } else {
        locationManager.startRangingBeacons(in: beaconRegion)
    }
}

func stopRangingBeacons() {
    if #available(iOS 13.0, *) {
        locationManager.stopRangingBeacons(satisfying: beaconRegion.beaconIdentityConstraint)
    } else {
        locationManager.stopRangingBeacons(in: beaconRegion)
    }

}

`didRangeBeacons`

- (void)locationManager:(CLLocationManager *)manager
        didRangeBeacons:(NSArray<CLBeacon *> *)beacons
   satisfyingConstraint:(CLBeaconIdentityConstraint *)beaconConstraint API_AVAILABLE(ios(13.0)) API_UNAVAILABLE(watchos, tvos, macos);

- (void)locationManager:(CLLocationManager *)manager
        didRangeBeacons:(NSArray<CLBeacon *> *)beacons
               inRegion:(CLBeaconRegion *)region API_DEPRECATED_WITH_REPLACEMENT("Use locationManager:didRangeBeacons:satisfyingConstraint:", ios(7.0, 13.0)) API_UNAVAILABLE(macos, macCatalyst) API_UNAVAILABLE(watchos, tvos);

サンプル

@available(iOS 13, *)
func locationManager(_ manager: CLLocationManager, didRange beacons: [CLBeacon], satisfying beaconConstraint: CLBeaconIdentityConstraint) {

}

func locationManager(_ manager: CLLocationManager, didRangeBeacons beacons: [CLBeacon], in region: CLBeaconRegion) {

}

`rangingBeaconsDidFailForRegion`

- (void)locationManager:(CLLocationManager *)manager
didFailRangingBeaconsForConstraint:(CLBeaconIdentityConstraint *)beaconConstraint
                  error:(NSError *)error API_AVAILABLE(ios(13.0)) API_UNAVAILABLE(watchos, tvos, macos);

- (void)locationManager:(CLLocationManager *)manager
rangingBeaconsDidFailForRegion:(CLBeaconRegion *)region
              withError:(NSError *)error API_DEPRECATED_WITH_REPLACEMENT("Use locationManager:didFailRangingBeaconsForConstraint:error:", ios(7.0, 13.0)) API_UNAVAILABLE(macos, macCatalyst) API_UNAVAILABLE(watchos, tvos);

サンプル

@available(iOS 13, *)
func locationManager(_ manager: CLLocationManager, didFailRangingFor beaconConstraint: CLBeaconIdentityConstraint, error: Error) {

}

func locationManager(_ manager: CLLocationManager, rangingBeaconsDidFailFor region: CLBeaconRegion, withError error: Error) {

}

公式のサンプルコード

WWDC19のセッション