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What's new in iOS 7

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  • 1. What’s new in iOS 7? Highlights of 1500 new APIs Jordi Gimenez (@gimix3) & Hermes Pique (@hpique) NSBarcelona
  • 2. 82% of devices are using iOS 7. As measured by the App Store during a 7-day period ending February 23, 2014.
  • 3. Agenda What we will cover • • • • • • • NSTextStorage UIViewController transitions iCloud & Core Data App Store Receipt Speech Synthesis JavaScript Evaluation New Networking Possibilities
  • 4. NSTextStorage
  • 5. Text Kit UILabel UITextView Text Kit Core Text Core Graphics UITextField
  • 6. Text Kit Classes NSTextStorage NSLayoutManager NSTextContainer What? How? Where? (text & attributes) (glyphs & location) (areas)
  • 7. Text Kit Use defaults or provide your own classes textStorage = [NSTextStorage new]; layoutManager = [NSLayoutManager new]; textContainer = [[NSTextContainer alloc] initWithSize:size]; [layoutManager addTextContainer:textContainer]; [textStorage addLayoutManager:layoutManager]; ! textView = [[UITextView alloc] initWithFrame:frame textContainer:textContainer];
  • 8. Text Kit NSTextStorage • NSMutableAttributedString subclass • Subclass to provide custom editing - (void)processEditing { [_backingStore beginEditing]; // Custom editing [_backingStore endEditing]; [super processEditing]; }
  • 9. Text Kit Using images in NSTextStorage (void)replaceLettersInRange:(NSRange)range { [backingStore.string enumerateSubstringsInRange:range options:NSStringEnumerationByComposedCharacterSequences usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) { ! NSTextAttachment *textAttachment = [NSTextAttachment new]; textAttachment.image = [self imageForString:substring]; NSAttributedString *attributed = [NSAttributedString attributedStringWithAttachment:textAttachment]; [backingStore replaceCharactersInRange:substringRange withAttributedString:attributed]; ! }]; }
  • 10. Demo github.com/NSBarcelona/CandyCrushKeyboard
  • 11. UIViewController Transitions
  • 12. UIViewController Transitions Customizable transitions • • • • Presentations and dismissals UINavigationController UITabBarController UICollectionViewController layout-to-layout
  • 13. UIViewController Transitions The container view Container view UIViewController A UIViewController B View A View B
  • 14. UIViewController Transitions Returning the transition animation - (id <UIViewControllerAnimatedTransitioning>)navigationController: (UINavigationController *)navigationController animationControllerForOperation:(UINavigationControllerOperation)operation fromViewController:(UIViewController *)fromVC toViewController:(UIViewController *)toVC { id<UIViewControllerAnimatedTransitioning> animator = [MyAnimationController new]; return animator; }
  • 15. UIViewController Transitions Animating the transition - (void)animateTransition:(id <UIViewControllerContextTransitioning>)context { ! UIViewController *fromVC = [context viewControllerForKey:UITransitionContextFromViewControllerKey]; UIViewController *toVC = [context viewControllerForKey:UITransitionContextToViewControllerKey]; UIView *container = context.containerView; [container insertSubview:toViewController.view aboveSubview:fromViewController.view]; ! // Prepare for animation ! NSTimeInterval duration = [self transitionDuration:context]; [UIView animateWithDuration:duration animations:^{ // Animations } completion:^(BOOL finished) { // Cleanup and restore state [context completeTransition:YES]; }]; }
  • 16. Demo github.com/NSBarcelona/Transictures
  • 17. Adding iCloud to Core Data
  • 18. “…the average [US] household has 1.6 Apple devices.” –CNBC in 2012
  • 19. iCloud • Using iCloud in iOS 5-6 is a bug • Sync network setup (!) • Limited APIs • Poor support for account changes • Unreliability • In iOS 7 it’s actually usable
  • 20. iCloud Core Data with iCloud in 3 steps 1. Add iCloud to Core Data 2. Respond to changes 3. Respond to account changes
  • 21. iCloud Adding iCloud to Core Data NSDictionary *options = @{ NSPersistentStoreUbiquitousContentNameKey : @"name" } ! [persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:url options:options error:&error];
  • 22. iCloud Responding to changes NSPersistentStoreDidImportUbiquitousContentChangesNotification ! ! [moc performBlockAndWait:^{ [moc mergeChangesFromContextDidSaveNotification:notification]; }];
  • 23. iCloud Responding to account changes NSPersistentStoreCoordinatorStoresWillChangeNotification ! ! dispatch_sync(dispatch_get_main_queue(), ^{ // Prepare UI }); [moc performBlockAndWait:^{ NSError *error = nil; if ([moc hasChanges]) { [moc save:&error]; } [moc reset]; }];
  • 24. iCloud Responding to account changes NSPersistentStoreCoordinatorStoresDidChangeNotification ! ! dispatch_sync(dispatch_get_main_queue(), ^{ // Update UI });
  • 25. Demo github.com/NSBarcelona/CloudPhotos
  • 26. The App Store Receipt
  • 27. “This is doable.” –James Wilson (Engineering Manager for the App Store in OS X) at WWDC 2013, about verifying the App Store receipt
  • 28. App Store Receipt Verification in 5 steps 1. 2. 3. 4. 5. Get the receipt data Verify the receipt signature Get the receipt fields Verify the receipt hash Get in-app purchases (optional)
  • 29. App Store Receipt Getting the receipt data const char *cpath = [[path stringByStandardizingPath] fileSystemRepresentation]; FILE *fp = fopen(cpath, "rb"); if (!fp) return nil; ! PKCS7 *p7 = d2i_PKCS7_fp(fp, NULL); fclose(fp); if (!p7) return nil; ! NSURL *certificateURL = [[NSBundle mainBundle] URLForResource:@"AppleIncRootCertificate" withExtension:@"cer"]; NSData *certificateData = [NSData dataWithContentsOfURL:certificateURL]; if ([self verifyPCKS7:p7 withCertificateData:certificateData]) { struct pkcs7_st *contents = p7->d.sign->contents; if (PKCS7_type_is_data(contents)) { ASN1_OCTET_STRING *octets = contents->d.data; data = [NSData dataWithBytes:octets->data length:octets->length]; } } PKCS7_free(p7);
  • 30. App Store Receipt Verifying the receipt signature int result = 0; OpenSSL_add_all_digests(); // Required for PKCS7_verify to work X509_STORE *store = X509_STORE_new(); if (store) { const uint8_t *certificateBytes = (uint8_t *)(certificateData.bytes); X509 *certificate = d2i_X509(NULL, &certificateBytes (long)certificateData.length); if (certificate){ X509_STORE_add_cert(store, certificate); BIO *payload = BIO_new(BIO_s_mem()); result = PKCS7_verify(container, NULL, store, NULL, payload, 0); BIO_free(payload); X509_free(certificate); } } X509_STORE_free(store); EVP_cleanup();
  • 31. App Store Receipt Getting the receipt fields [RMAppReceipt enumerateASN1Attributes:asn1Data.bytes length:asn1Data.length usingBlock:^(NSData *data, int type) { const uint8_t *s = data.bytes; const NSUInteger length = data.length; switch (type) { case 2: bundleIdData = data; _bundleId = RMASN1ReadUTF8String(&s, length); break; case 3: appVersion = RMASN1ReadUTF8String(&s, length); break; case 4: opaqueValue = data; break; case 5: hash = data; break; case 17: { RMAppReceiptIAP *purchase = [[RMAppReceiptIAP alloc] initWithASN1Data:data]; [purchases addObject:purchase]; break; } case 19: originalAppVersion = RMASN1ReadUTF8String(&s, length); break; case 21: expirationDate = [RMAppReceipt formatRFC3339String:RMASN1ReadIA5SString(&s, length)]; break; } }];
  • 32. App Store Receipt Verifying the receipt hash NSUUID *uuid = [[UIDevice currentDevice] identifierForVendor]; unsigned char uuidBytes[16]; [uuid getUUIDBytes:uuidBytes]; ! NSMutableData *data = [NSMutableData data]; [data appendBytes:uuidBytes length:sizeof(uuidBytes)]; [data appendData:opaqueValue]; [data appendData:bundleIdData]; ! NSMutableData *expectedHash = [NSMutableData dataWithLength:SHA_DIGEST_LENGTH]; SHA1(data.bytes, data.length, expectedHash.mutableBytes); ! BOOL verified = [expectedHash isEqualToData:hash];
  • 33. App Store Receipt Getting the in-app purchases [RMAppReceipt enumerateASN1Attributes:asn1Data.bytes length:asn1Data.length usingBlock:^(NSData *data, int type) { const uint8_t *p = data.bytes; const NSUInteger length = data.length; switch (type) { case 1701: quantity = RMASN1ReadInteger(&p, length); break; case 1702: productId = RMASN1ReadUTF8String(&p, length); break; case 1703: transactionIdentifier = RMASN1ReadUTF8String(&p, length); break; case 1704: purchaseDate = [RMAppReceipt formatRFC3339String:RMASN1ReadIA5SString(&p, length)]; case 1705: originalTransactionId = RMASN1ReadUTF8String(&p, length); break; case 1706: originalPurchaseDate = [RMAppReceipt formatRFC3339String:RMASN1ReadIA5SString(&p, length)]; break; case 1708: subscriptionExpirationDate = [RMAppReceipt formatRFC3339String:RMASN1ReadIA5SString(&p, length)]; break; case 1711: webOrderLineItemID = RMASN1ReadInteger(&p, length); break; case 1712: cancellationDate = [RMAppReceipt formatRFC3339String:RMASN1ReadIA5SString(&p, length)]; break; } }];
  • 34. Demo github.com/robotmedia/RMStore
  • 35. About me Jordi Giménez • CTO at Mobile Jazz • Co-organizer of NSBarcelona • iOS and Android developer • High-availability, high-scalability • IT Security
  • 36. Speech Synthesis with AV Foundation AV Foundation framework provides essential services for working with time-based audiovisual media. Play, capture, edit, or encode media.
  • 37. AV Foundation Speech synthesis • AVFoundation allows provides a convenient interface to the speech synthesizer AVSpeechSynthesizer *synthesizer = [AVSpeechSynthesizer new]; AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:@"Hello world!"]; [synthesizer speakUtterance:utterance];
  • 38. JavaScriptCore Evaluate JavaScript in your iOS applications
  • 39. JavaScriptCore • • • • New Objective-C interface Allows Objective-C Language Binding Good for JSON parsing/transformation Platform independent code
  • 40. JavaScript Execution // make an execution context JSContext *context = [[JSContext alloc] initWithVirtualMachine: [[JSVirtualMachine alloc] init]]; ! // read and write variables context[@"a"] = @5; // write global variables JSValue *aValue = context[@"a"]; // read global variables double a = [aValue toDouble];
  • 41. JavaScript Execution // declare a function [context evaluateScript:@"var square = function(x) {return x*x;}”]; ! // run a function JSValue *squareFunction = context[@"square"]; JSValue *result = [squareFunction callWithArguments:@[@3]];
  • 42. JavaScript Execution // declare a function as an Objective-C block context[@"square"] = ^(int x) { return x*x; };
  • 43. Networking APIs
  • 44. New networking APIs • Multitasking: background execution of network tasks • AirDrop: data transfer between nearby devices • Multipeer connectivity: message passing between ad-hoc groups of people
  • 45. Multitasking iOS applications can’t generally run in the background, in order to save battery and boost performance • UIBackgroundModes specify when the app should wake up • • • • • • • • • audio location newsstand-content external-accessory bluetooth-central bluetooth-peripherial fetch remote-notification
  • 46. Multitasking Background fetch: wake up at intervals // 1. Specify `fetch` in UIBackgroundModes in Info.plist to wake up the application at intervals. ! // 2. Give an interval hint: [[UIApplication sharedApplication] setMinimumBackgroundFetchInterval:UIApplicationBackgroundFetchIntervalMinimum]; ! // 3. Handle fetch wakeup -(void) application:(UIApplication *)application performFetchWithCompletionHandler: (void(^) (UIBackgroundFetchResult))completionHandler { // fetch content from the network if(newContent) { completionHandler(UIBackgroundFetchResultNewData); } else { completionHandler(UIBackgroundFetchResultNoData); } }
  • 47. Multitasking Remote notifications: wake up on server demand // 1. Specify `remote-notification` in UIBackgroundModes in Info.plist to wake up the application upon reception of push notifications with `content-available=1` attribute. ! // 2. Handle fetch wakeup - (void) application:(UIApplication *)application didReceiveRemoteNotification: (NSDictionary *)userInfo performFetchWithCompletionHandler:(void(^) (UIBackgroundFetchResult))completionHandler { if([[userInfo objectForKey:@"content-available"] intValue] != 1) { completionHandler(UIBackgroundFetchResultNoData); // no content-available! return; } // fetch content from the network if(newContent) { completionHandler(UIBackgroundFetchResultNewData); } else { completionHandler(UIBackgroundFetchResultNoData); } }
  • 48. Multitasking Background Transfer Service Transferring files can be a problem: • Intermittent connectivity • User switching applications • Network conditioned operations (eg. wifi only)
  • 49. Multitasking Background Transfer Service Uploads/downloads files even if the application is in background ! 1. 2. 3. 4. Make an NSURLSession with the desired NSURLSessionConfiguration Provide a session identifier and delegate Initiate a task Delegate methods will be called upon progress/completion
  • 50. Multitasking Background Transfer Service The application might be killed while in the background. ! To deal with background mode, also implement -application:handleEventsForBackgroundURLSession:completionHandler: like this: ! 1. Look at the session identifier provided by the system 2. Make an NSURLSession with the desired NSURLSessionConfiguration, matching the settings for that identifier, with a delegate 3. Delegate methods will be called to notify completion
  • 51. AirDrop
  • 52. AirDrop AirDrop lets users share photos, documents, URLs (including custom schemes), and other kinds of data via Wifi/Bluetooth ! (See Apple’s AirDropSample)
  • 53. AirDrop Sending a file 1. Implement a class with the UIActivityItemSource protocol
 Provides: • a URL with custom scheme or • an UTI + NSData. 2. Display a UIActivityViewController to handle your class instance ! UIActivityViewController already existed before to share data between apps, AirDrop was added
  • 54. AirDrop Receiving a file • Add the document types and URL schemes you want to support (Xcode Target > Info) ! ! ! ! ! ! No matter where the file comes from (local or AirDrop) you will receive it the same way.
  • 55. AirDrop Receiving a file // handle incoming URLs/files - (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation { if ([url.scheme isEqualToString:@"my-custom-scheme"]) { // handle custom scheme URL } else { // read file at URL } return YES; }
  • 56. Multipeer connectivity
  • 57. Multipeer connectivity • Allows to make ad-hoc groups of up to 8 devices in order to share data (NSData, streams) • Ideal for games or other kinds of data transfer on the spot
  • 58. iBeacons
  • 59. iBeacons • iBeacons are Bluetooth Low Energy devices emitting an identifier • CoreLocation integrates natively with iBeacons to provide regions • Applications can be notified when entering/leaving a region (even in the background) with very little power consumption ! • Useful for: • Locating areas at a retail store • Augmentation of museum • Geocaching/scavenger hunt games • Tourism
  • 60. iBeacons Listen for iBeacons // tell location manager to start monitoring for the beacon region region = [[CLBeaconRegion alloc] initWithProximityUUID:uuid identifier:@"ibeacon.test"]; ! [locationManager startMonitoringForRegion:region]; [locationManager startRangingBeaconsInRegion:region]; ! // listen for location manager updates -(void)locationManager:(CLLocationManager*)manager didRangeBeacons:(NSArray*)beacons inRegion:(CLBeaconRegion*)region { NSLog(@"Beacons found: %@", beacons); }
  • 61. iBeacons Advertising your iDevice // start the peripheral manager, tells about Bluetooth state peripheralManager = [[CBPeripheralManager alloc] initWithDelegate:self queue:nil options:nil]; ! // listen for bluetooth peripheral updates -(void)peripheralManagerDidUpdateState:(CBPeripheralManager*)peripheral { if (peripheral.state == CBPeripheralManagerStatePoweredOn) { // makes a region describing this device CLBeaconRegion *advertisingRegion = [[CLBeaconRegion alloc] initWithProximityUUID:uuid major:33 minor:44 identifier:@"ibeacon.test"]; // gets this device's data to use as beacon NSDictionary* beaconData = [advertisingRegion peripheralDataWithMeasuredPower:nil]; // advertises [self.peripheralManager startAdvertising:beaconData]; } else if (peripheral.state == CBPeripheralManagerStatePoweredOff) { [self.peripheralManager stopAdvertising]; } }
  • 62. Wrap up • Speech synthesis • JavaScript evaluation • Networking in the background • Background fetch • Remote notification background mode • Background Transfer Service • AirDrop & Multi-peer connectivity • iBeacons
  • 63. So… What’s new in iOS 7? OK, you want the full list • https://developer.apple.com/ios7/ • https://developer.apple.com/library/prerelease/ios/releasenotes/General/ WhatsNewIniOS/Article
  • 64. Thank you! ! Check out our sample code at: github.com/nsbarcelona Hermes Pique! @hpique Jordi Giménez! jordi@mobilejazz.cat