updated chapter 22 examples

bk1ch12p499cancelableTimer/ch12p325NotificationLeaker/CancelableTimer.swift

@@ -16,7 +16,7 @@ class CancelableTimer: NSObject {
         self.firsttime = true
         self.cancel()
         self.timer = DispatchSource.makeTimerSource(queue: self.q)
-        self.timer.scheduleRepeating(wallDeadline: DispatchWallTime.now(), interval: interval)
+        self.timer.scheduleRepeating(wallDeadline: .now(), interval: interval)
         // self.timer.scheduleRepeating(deadline: .now(), interval: 1, leeway: .milliseconds(1))
         self.timer.setEventHandler {
             if self.firsttime {

bk2ch22p773location/ch35p1032location.xcodeproj/project.pbxproj

@@ -95,6 +95,7 @@
 				ORGANIZATIONNAME = "Matt Neuburg";
 				TargetAttributes = {
 					32315063182E903500B03F54 = {
+						DevelopmentTeam = W3LHX5RGV2;
 						LastSwiftMigration = 0800;
 						SystemCapabilities = {
 							com.apple.BackgroundModes = {
@@ -237,6 +238,7 @@
 				ARCHS = "$(ARCHS_STANDARD)";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
+				DEVELOPMENT_TEAM = W3LHX5RGV2;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "ch35p1032location/ch35p1032location-Prefix.pch";
 				INFOPLIST_FILE = "ch35p1032location/ch35p1032location-Info.plist";
@@ -255,6 +257,7 @@
 				ARCHS = "$(ARCHS_STANDARD)";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
+				DEVELOPMENT_TEAM = W3LHX5RGV2;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "ch35p1032location/ch35p1032location-Prefix.pch";
 				INFOPLIST_FILE = "ch35p1032location/ch35p1032location-Info.plist";

bk2ch22p773location/ch35p1032location/ViewController.swift

@@ -2,93 +2,105 @@
 import UIKit
 import CoreLocation
 
-class ViewController: UIViewController, CLLocationManagerDelegate {
-    lazy var locman : CLLocationManager = {
-        let locman = CLLocationManager()
-        locman.delegate = self
-        return locman
-    }()
-    var startTime : Date!
-    var trying = false
+class ManagerHolder {
+    let locman = CLLocationManager()
+    var delegate : CLLocationManagerDelegate? {
+        get {
+            return self.locman.delegate
+        }
+        set {
+            // set delegate _once_
+            if self.locman.delegate == nil && newValue != nil {
+                self.locman.delegate = newValue
+                print("setting delegate!")
+            }
+        }
+    }
     var doThisWhenAuthorized : (() -> ())?
-
-    @discardableResult
-    func determineStatus() -> Bool {
+    func checkForLocationAccess(always:Bool = false, andThen f: (()->())? = nil) {
+        // no services? fail but try get alert
         guard CLLocationManager.locationServicesEnabled() else {
-            self.locman.startUpdatingLocation() // might get "enable" dialog
-            return false
+            print("no location services")
+            self.locman.startUpdatingLocation()
+            return
         }
         let status = CLLocationManager.authorizationStatus()
         switch status {
         case .authorizedAlways, .authorizedWhenInUse:
-            return true
+            f?()
         case .notDetermined:
-            self.locman.requestWhenInUseAuthorization()
-            // locman.requestAlwaysAuthorization()
-            return false
+            self.doThisWhenAuthorized = f
+            always ?
+                self.locman.requestAlwaysAuthorization() :
+                self.locman.requestWhenInUseAuthorization()
         case .restricted:
-            return false
+            // do nothing
+            break
         case .denied:
-            let message = "Wouldn't you like to authorize" +
-            "this app to use Location Services?"
-            let alert = UIAlertController(title: "Need Authorization", message: message, preferredStyle: .alert)
-            alert.addAction(UIAlertAction(title: "No", style: .cancel))
-            alert.addAction(UIAlertAction(title: "OK", style: .default) {
-                _ in
-                let url = URL(string:UIApplicationOpenSettingsURLString)!
-                UIApplication.shared.open(url)
-            })
-            self.present(alert, animated:true)
-            return false
+            print("denied")
+            // do nothing, or beg the user to authorize us in Settings
+            break
         }
     }
+}
+
+
+
+class ViewController: UIViewController, CLLocationManagerDelegate {
+    let managerHolder = ManagerHolder()
+    var locman : CLLocationManager {
+        return self.managerHolder.locman
+    }
+
+    required init?(coder aDecoder: NSCoder) {
+        super.init(coder:aDecoder)
+        self.managerHolder.delegate = self
+    }
+
+    var startTime : Date!
+    var trying = false
 
     func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
         print("did change auth: \(status.rawValue)")
         switch status {
         case .authorizedAlways, .authorizedWhenInUse:
-            self.doThisWhenAuthorized?()
+            self.managerHolder.doThisWhenAuthorized?()
+            self.managerHolder.doThisWhenAuthorized = nil
         default: break
         }
     }
 
-    let which = 2 // 1 is old way, 2 is new way
+    let which = 2 // 1 or 2
 
     @IBAction func doFindMe (_ sender: Any!) {
-        self.doThisWhenAuthorized = {
-            [unowned self] in
-            print("resuming")
-            self.doFindMe(sender)
-        }
-        guard self.determineStatus() else {
-            print("not authorized")
-            return
-        }
-        self.doThisWhenAuthorized = nil
-
-        switch which {
-        case 1:
-            if self.trying { return }
-            self.trying = true
-            self.locman.desiredAccuracy = kCLLocationAccuracyBest
-            self.locman.activityType = .fitness
-            self.startTime = nil
-            print("starting")
-            self.locman.startUpdatingLocation()
-        case 2:
-            self.locman.desiredAccuracy = kCLLocationAccuracyBest
-            self.locman.requestLocation()
-        default: break
+        self.managerHolder.checkForLocationAccess {
+            switch self.which {
+            case 1:
+                if self.trying { return }
+                self.trying = true
+                self.locman.desiredAccuracy = kCLLocationAccuracyBest
+                self.locman.activityType = .fitness
+                self.startTime = nil
+                print("starting")
+                self.locman.startUpdatingLocation()
+            case 2:
+                print("requesting")
+                self.locman.desiredAccuracy = kCLLocationAccuracyBest
+                self.locman.requestLocation()
+            default: break
+            }
         }
     }
 
+
+
     func stopTrying () {
         self.locman.stopUpdatingLocation()
         self.startTime = nil
         self.trying = false
     }
 
-    func locationManager(_ manager: CLLocationManager, didFailWithError error: NSError) {
+    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
         print("failed: \(error)")
         self.stopTrying()
     }
@@ -125,6 +137,7 @@ class ViewController: UIViewController, CLLocationManagerDelegate {
             let loc = locations.last!
             let coord = loc.coordinate
             print("The quick way: You are at \(coord.latitude) \(coord.longitude)")
+            // bug: can be called twice in quick succession
         default: break
         }
     }

bk2ch22p775heading/ch35p1035heading.xcodeproj/project.pbxproj

@@ -95,6 +95,7 @@
 				ORGANIZATIONNAME = "Matt Neuburg";
 				TargetAttributes = {
 					3228D8A9182ED6DD00EBC319 = {
+						DevelopmentTeam = W3LHX5RGV2;
 						LastSwiftMigration = 0800;
 						SystemCapabilities = {
 							com.apple.BackgroundModes = {
@@ -237,6 +238,7 @@
 				ARCHS = "$(ARCHS_STANDARD)";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
+				DEVELOPMENT_TEAM = W3LHX5RGV2;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "ch35p1035heading/ch35p1035heading-Prefix.pch";
 				INFOPLIST_FILE = "ch35p1035heading/ch35p1035heading-Info.plist";
@@ -255,6 +257,7 @@
 				ARCHS = "$(ARCHS_STANDARD)";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
+				DEVELOPMENT_TEAM = W3LHX5RGV2;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "ch35p1035heading/ch35p1035heading-Prefix.pch";
 				INFOPLIST_FILE = "ch35p1035heading/ch35p1035heading-Info.plist";

bk2ch22p775heading/ch35p1035heading/ViewController.swift

@@ -6,16 +6,14 @@ import CoreLocation
 class ViewController: UIViewController, CLLocationManagerDelegate {
 
     @IBOutlet var lab : UILabel!
-    lazy var locman : CLLocationManager = {
-        let locman = CLLocationManager()
-        locman.delegate = self
-        return locman
-        }()
+    let locman = CLLocationManager()
     var updating = false
 
     @IBAction func doStart (_ sender: Any!) {
-        guard CLLocationManager.headingAvailable() else {return} // lacking hardware
+        guard CLLocationManager.headingAvailable() else {return} // no hardware
         if self.updating {return}
+        if self.locman.delegate == nil {self.locman.delegate = self}
+
         print("starting")
         self.locman.headingFilter = 5
         self.locman.headingOrientation = .portrait
@@ -33,13 +31,13 @@ class ViewController: UIViewController, CLLocationManagerDelegate {
         self.updating = false
     }
 
-    func locationManager(_ manager: CLLocationManager, didFailWithError error: NSError) {
+    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
         self.doStop(nil)
     }
 
     func locationManager(_ manager: CLLocationManager, didUpdateHeading newHeading: CLHeading) {
         var h = newHeading.magneticHeading
-        let h2 = newHeading.trueHeading // will be -1 if we have no location info
+        let h2 = newHeading.trueHeading // -1 if no location info
         print("\(h) \(h2) ")
         if h2 >= 0 {
             h = h2
@@ -59,8 +57,8 @@ class ViewController: UIViewController, CLLocationManagerDelegate {
     }
 
     func locationManagerShouldDisplayHeadingCalibration(_ manager: CLLocationManager) -> Bool {
+        print("he asked me, he asked me")
         return true // if you want the calibration dialog to be able to appear
-        // I did in fact see it appear, so this works in iOS 8.3 at least
     }
 
 

bk2ch22p780shake/ch35p1037shake.xcodeproj/project.pbxproj

@@ -95,6 +95,7 @@
 				ORGANIZATIONNAME = "Matt Neuburg";
 				TargetAttributes = {
 					32124890182F1AEF008CB25D = {
+						DevelopmentTeam = W3LHX5RGV2;
 						LastSwiftMigration = 0800;
 					};
 				};
@@ -232,6 +233,7 @@
 				ARCHS = "$(ARCHS_STANDARD)";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
+				DEVELOPMENT_TEAM = W3LHX5RGV2;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "ch35p1037shake/ch35p1037shake-Prefix.pch";
 				INFOPLIST_FILE = "ch35p1037shake/ch35p1037shake-Info.plist";
@@ -250,6 +252,7 @@
 				ARCHS = "$(ARCHS_STANDARD)";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
+				DEVELOPMENT_TEAM = W3LHX5RGV2;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "ch35p1037shake/ch35p1037shake-Prefix.pch";
 				INFOPLIST_FILE = "ch35p1037shake/ch35p1037shake-Info.plist";

bk2ch22p780shake/ch35p1037shake/ViewController.swift

@@ -6,7 +6,7 @@ class ViewController: UIViewController {
     // shake device (or simulator), watch console for response
     // note that this does not disable Undo by shaking in text field
 
-    override func canBecomeFirstResponder() -> Bool {
+    override var canBecomeFirstResponder : Bool {
         return true
     }
 
@@ -16,7 +16,7 @@ class ViewController: UIViewController {
     }
 
     override func motionEnded(_ motion: UIEventSubtype, with event: UIEvent?) {
-        if self.isFirstResponder() {
+        if self.isFirstResponder {
             print("hey, you shook me!")
         } else {
             super.motionEnded(motion, with: event)

bk2ch22p782lyingDown/ch25p1039lyingDown.xcodeproj/project.pbxproj

@@ -95,6 +95,7 @@
 				ORGANIZATIONNAME = "Matt Neuburg";
 				TargetAttributes = {
 					321248D1182F1F25008CB25D = {
+						DevelopmentTeam = W3LHX5RGV2;
 						LastSwiftMigration = 0800;
 					};
 				};
@@ -232,6 +233,7 @@
 				ARCHS = "$(ARCHS_STANDARD)";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
+				DEVELOPMENT_TEAM = W3LHX5RGV2;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "ch25p1039lyingDown/ch25p1039lyingDown-Prefix.pch";
 				INFOPLIST_FILE = "ch25p1039lyingDown/ch25p1039lyingDown-Info.plist";
@@ -250,6 +252,7 @@
 				ARCHS = "$(ARCHS_STANDARD)";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
+				DEVELOPMENT_TEAM = W3LHX5RGV2;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "ch25p1039lyingDown/ch25p1039lyingDown-Prefix.pch";
 				INFOPLIST_FILE = "ch25p1039lyingDown/ch25p1039lyingDown-Info.plist";

bk2ch22p782lyingDown/ch25p1039lyingDown/ViewController.swift

@@ -44,22 +44,21 @@ class ViewController: UIViewController {
             self.motman.startAccelerometerUpdates()
             self.timer = Timer.scheduledTimer(timeInterval:self.motman.accelerometerUpdateInterval, target: self, selector: #selector(pollAccel), userInfo: nil, repeats: true)
         case 2:
-            self.motman.startAccelerometerUpdates(to: .main) {
-                (accelerometerData:CMAccelerometerData?, error:NSError?) in
-                guard let dat = accelerometerData else {
-                    print(error)
+            self.motman.startAccelerometerUpdates(to: .main) { data, err in
+                guard let data = data else {
+                    print(err)
                     self.stopAccelerometer()
                     return
                 }
-                self.receive(acceleration:dat)
+                self.receive(acceleration:data)
             }
         default:break
         }
     }
 
     func pollAccel (_: Any!) {
-        guard let dat = self.motman.accelerometerData else {return}
-        self.receive(acceleration:dat)
+        guard let data = self.motman.accelerometerData else {return}
+        self.receive(acceleration:data)
     }
 
     func add(acceleration accel:CMAcceleration) {
@@ -69,8 +68,8 @@ class ViewController: UIViewController {
         self.oldZ = accel.z * alpha + self.oldZ * (1.0 - alpha)
     }
 
-    func receive(acceleration dat:CMAccelerometerData) {
-        self.add(acceleration: dat.acceleration)
+    func receive(acceleration data:CMAccelerometerData) {
+        self.add(acceleration: data.acceleration)
         let x = self.oldX
         let y = self.oldY
         let z = self.oldZ