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CLLocationManager+LambdaKit.swift
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CLLocationManager+LambdaKit.swift
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//
// CLLocationManager+LambdaKit.swift
// Created by Martin Conte Mac Donell on 3/31/15.
//
// Copyright (c) 2015 Lyft (http://lyft.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
import CoreLocation
public typealias LKCoreLocationHandler = (LKLocationOrError) -> Void
// A global var to produce a unique address for the assoc object handle
private var associatedEventHandle: UInt8 = 0
/// CLLocationManager with closure callback.
///
/// Note that when using startUpdatingLocation(handler) you need to use the counterpart
/// `stopUpdatingLocationHandler` or you'll leak memory.
///
/// Example:
///
/// ```swift let
/// locationManager = CLLocationManager()
/// locationManager.starUpdatingLocation { location in
/// print("Location: \(location)")
/// }
/// locationManager.stopUpdatingLocationHandler()
/// ```
///
/// WARNING: You cannot use closures *and* set a delegate at the same time. Setting a delegate will prevent
/// closures for being called and setting a closure will overwrite the delegate property.
/// An enum that will represent either a location or an error with corresponding associated values.
///
/// - Location: A location as reported by Core Location.
/// - Error: An error coming from Core Location, for example when location service usage is denied.
public enum LKLocationOrError {
case location(CLLocation)
case error(NSError)
}
extension CLLocationManager: CLLocationManagerDelegate {
private var closureWrapper: ClosureWrapper? {
get {
return objc_getAssociatedObject(self, &associatedEventHandle) as? ClosureWrapper
}
set {
objc_setAssociatedObject(self, &associatedEventHandle, newValue,
objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
/// Starts monitoring GPS location changes and call the given closure for each change.
///
/// - parameter completion: A closure that will be called passing as the first argument the device's
/// location.
public func startUpdatingLocation(_ completion: @escaping LKCoreLocationHandler) {
self.closureWrapper = ClosureWrapper(handler: completion)
self.delegate = self
self.startUpdatingLocation()
if let location = self.location {
completion(.location(location))
}
}
/// Stops monitoring GPS location changes and cleanup.
public func stopUpdatingLocationHandler() {
self.stopUpdatingLocation()
self.closureWrapper = nil
self.delegate = nil
}
/// Request the current location which is reported in the completion handler.
///
/// - parameter completion: A closure that will be called with the device's current location.
@available(iOS 9, *)
public func requestLocation(_ completion: @escaping LKCoreLocationHandler) {
self.closureWrapper = ClosureWrapper(handler: completion)
self.delegate = self
self.requestLocation()
if let location = self.location {
completion(.location(location))
}
}
#if !os(watchOS)
/// Starts monitoring significant location changes and call the given closure for each change.
///
/// - parameter completion: A closure that will be called passing as the first argument the device's
/// location.
public func startMonitoringSignificantLocationChanges(_ completion: @escaping LKCoreLocationHandler) {
self.closureWrapper = ClosureWrapper(handler: completion)
self.delegate = self
self.startMonitoringSignificantLocationChanges()
}
/// Stops monitoring GPS location changes and cleanup.
public func stopMonitoringSignificantLocationChangesHandler() {
self.stopMonitoringSignificantLocationChanges()
self.closureWrapper = nil
self.delegate = nil
}
#endif
public func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if let handler = self.closureWrapper?.handler, let location = manager.location {
handler(.location(location))
}
}
public func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
self.closureWrapper?.handler(.error(error as NSError))
}
}
// MARK: - Private Classes
fileprivate final class ClosureWrapper {
fileprivate var handler: LKCoreLocationHandler
fileprivate init(handler: @escaping LKCoreLocationHandler) {
self.handler = handler
}
}