added strategy

Author: swiftuiux

README.md

@@ -67,6 +67,10 @@ public protocol ILocationManagerViewModel: ObservableObject{
     @MainActor
     var locations : [CLLocation] { get }
     
+    /// Strategy for publishing locations Default value is .keepAll 
+    /// .keepLast is optional
+    var strategy : LMViewModel.Strategy { get }
+    
     /// Start streaming locations
     func start() async throws
     

Sources/d3-async-location/enum/Strategy.swift

@@ -0,0 +1,31 @@
+//
+//  Strategy.swift
+//  
+//
+//  Created by Igor on 10.02.2023.
+//
+
+import Foundation
+
+@available(iOS 14.0, watchOS 7.0, *)
+public extension LMViewModel{
+    
+    /// Strategy for publishing locations
+     enum Strategy{
+         
+        case keepAll
+         
+        case keepLast
+         
+         /// Check if the strategy keep all streamed values
+         var isKeepLast: Bool{
+             self == .keepLast
+         }
+         
+         /// Check if the strategy keep only the last one
+         var isKeepAll: Bool{
+             self == .keepAll
+         }
+         
+    }
+}

Sources/d3-async-location/protocol/ILocationManagerViewModel.swift

@@ -15,6 +15,9 @@ public protocol ILocationManagerViewModel: ObservableObject{
     @MainActor
     var locations : [CLLocation] { get }
 
+    /// Strategy for publishing locations Default value is .keepAll
+    var strategy : LMViewModel.Strategy { get }
+    
     /// Start streaming locations
     func start() async throws
 

Sources/d3-async-location/viewmodel/LMViewModel.swift

@@ -17,6 +17,9 @@ public final class LMViewModel: ILocationManagerViewModel{
 
     // MARK: - Public
 
+    /// Strategy for publishing locations Default value is .keepAll
+    public let strategy : Strategy
+    
     /// List of locations Subscribe different Views to locations publisher to feed them
     /// or create a proxy to manipulate with the flow like filtering, dropping, mapping etc
     @MainActor @Published public private(set) var locations : [CLLocation] = []
@@ -37,15 +40,20 @@ public final class LMViewModel: ILocationManagerViewModel{
     // MARK: - Life circle
 
     /// - Parameters:
+    ///   - strategy: Strategy for publishing locations Default value is .keepAll
     ///   - accuracy: The accuracy of a geographical coordinate.
     ///   - activityType: Constants indicating the type of activity associated with location updates.
     ///   - distanceFilter: A distance in meters from an existing location.
     ///   - backgroundUpdates: A Boolean value that indicates whether the app receives location updates when running in the background
-    public init(accuracy : CLLocationAccuracy? = nil,
+    public init(
+                strategy : Strategy = .keepLast,
+                accuracy : CLLocationAccuracy? = nil,
                 activityType: CLActivityType? = nil,
                 distanceFilter: CLLocationDistance? = nil,
                 backgroundUpdates : Bool = false){
 
+        self.strategy = strategy
+                    
         manager = .init(accuracy, activityType, distanceFilter, backgroundUpdates)
     }
 
@@ -96,7 +104,11 @@ public final class LMViewModel: ILocationManagerViewModel{
     /// - Parameter coordinate: data
     @MainActor
     private func add(_ coordinate : CLLocation) {
-        locations.append(coordinate)
+        if strategy.isKeepAll || locations.isEmpty{
+            locations.append(coordinate)
+        }else if strategy.isKeepLast{
+            locations[0] = coordinate            
+        }
     }
 
     /// Set state