Add offline mode

CapCollector/Base.lproj/Main.storyboard

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="16096" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="qlf-I7-aOI">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="16097.2" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="qlf-I7-aOI">
     <device id="retina4_7" orientation="portrait" appearance="light"/>
     <dependencies>
         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="16087"/>
@@ -168,7 +168,7 @@
                         </connections>
                     </tableView>
                     <navigationItem key="navigationItem" title="Caps" id="qe9-JJ-Ei4">
-                        <barButtonItem key="leftBarButtonItem" image="arrow.clockwise.icloud" catalog="system" id="SDv-mW-eqq">
+                        <barButtonItem key="leftBarButtonItem" title="Item" image="arrow.clockwise.icloud" catalog="system" id="SDv-mW-eqq">
                             <connections>
                                 <action selector="updateInfo:" destination="2ro-5c-16N" id="DgZ-Jh-0hR"/>
                             </connections>
@@ -179,6 +179,9 @@
                             </connections>
                         </barButtonItem>
                     </navigationItem>
+                    <connections>
+                        <outlet property="infoButton" destination="SDv-mW-eqq" id="hKf-A3-chi"/>
+                    </connections>
                 </tableViewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="xpG-Fd-7Lc" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
             </objects>

CapCollector/Data/Database.swift

@@ -145,6 +145,16 @@ final class Database {
         }
     }
     
+    var isInOfflineMode: Bool {
+        set {
+            UserDefaults.standard.set(newValue, forKey: Upload.offlineKey)
+            log("Offline mode set to \(newValue)")
+        }
+        get {
+            UserDefaults.standard.bool(forKey: Upload.offlineKey)
+        }
+    }
+    
     // MARK: Data updates
     
     /**
@@ -168,6 +178,10 @@ final class Database {
             log("Cap image not saved")
             return false
         }
+        guard !isInOfflineMode else {
+            log("Offline mode: Not uploading cap")
+            return true
+        }
         upload.upload(name: name, for: cap.id) { success in
             guard success else {
                 return
@@ -224,6 +238,10 @@ final class Database {
             log("Failed to add cap \(cap) version \(version) to upload queue")
             return false
         }
+        guard !isInOfflineMode else {
+            log("Offline mode: Not uploading cap image")
+            return true
+        }
         upload.uploadImage(for: cap, version: version) { actualVersion in
             guard let actualVersion = actualVersion else {
                 self.log("Failed to upload image \(version) for cap \(cap)")

CapCollector/Data/Upload.swift

@@ -12,6 +12,8 @@ import SQLite
 
 struct Upload {
     
+    static let offlineKey = "offline"
+    
     let serverUrl: URL
        
     let table = Table("uploads")

CapCollector/TableView.swift

@@ -12,6 +12,8 @@ import JGProgressHUD
 
 class TableView: UITableViewController {
     
+    @IBOutlet weak var infoButton: UIBarButtonItem!
+    
     private var classifier: Classifier?
     
     private var accessory: SearchAndDisplayAccessory?
@@ -79,7 +81,11 @@ class TableView: UITableViewController {
 
     // MARK: - Actions
     
-    @IBAction func updateInfo(_ sender: UIBarButtonItem) {
+    @IBAction func updateInfo(_ sender: UIBarButtonItem, forEvent event: UIEvent) {
+        guard let touch = event.allTouches?.first, touch.tapCount > 0, !app.database.isInOfflineMode else {
+            showOfflineDialog()
+            return
+        }
         downloadCapNames()
     }
     
@@ -122,6 +128,8 @@ class TableView: UITableViewController {
         accessory = SearchAndDisplayAccessory(width: self.view.frame.width)
         accessory?.delegate = self
         
+        initInfoButton()
+        
         app.database.delegate = self
         let count = app.database.capCount
         if count == 0 {
@@ -152,6 +160,16 @@ class TableView: UITableViewController {
         initNavigationItemTitleView()
     }
     
+    private func initInfoButton() {
+        let offline = app.database.isInOfflineMode
+        setInfoButtonIcon(offline: offline)
+    }
+    
+    private func setInfoButtonIcon(offline: Bool) {
+        let symbol = offline ? "icloud.slash" : "arrow.clockwise.icloud"
+        infoButton.image = UIImage(systemName: symbol)
+    }
+    
     private func initNavigationItemTitleView() {
         self.titleLabel = UILabel()
         titleLabel.text = titleText
@@ -315,6 +333,13 @@ class TableView: UITableViewController {
         nav.allowLandscape = true
     }
     
+    private func showOfflineDialog() {
+        let offline = app.database.isInOfflineMode
+        if offline {
+            
+        }
+    }
+    
     private func downloadCapNames() {
         app.database.downloadCapNames { success in
             guard success else {