What's new in iOS 7

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Information about What's new in iOS 7

Published on March 7, 2014

Author: barcelonaio



What’s new in iOS 7? Highlights of 1500 new APIs Jordi Gimenez (@gimix3) & Hermes Pique (@hpique) NSBarcelona

82% of devices are using iOS 7. As measured by the App Store during a 7-day period ending February 23, 2014.

Agenda What we will cover • • • • • • • NSTextStorage UIViewController transitions iCloud & Core Data App Store Receipt Speech Synthesis JavaScript Evaluation New Networking Possibilities


Text Kit UILabel UITextView Text Kit Core Text Core Graphics UITextField

Text Kit Classes NSTextStorage NSLayoutManager NSTextContainer What? How? Where? (text & attributes) (glyphs & location) (areas)

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];

Text Kit NSTextStorage • NSMutableAttributedString subclass • Subclass to provide custom editing - (void)processEditing { [_backingStore beginEditing]; // Custom editing [_backingStore endEditing]; [super processEditing]; }

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]; ! }]; }


UIViewController Transitions

UIViewController Transitions Customizable transitions • • • • Presentations and dismissals UINavigationController UITabBarController UICollectionViewController layout-to-layout

UIViewController Transitions The container view Container view UIViewController A UIViewController B View A View B

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; }

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]; }]; }


Adding iCloud to Core Data

“…the average [US] household has 1.6 Apple devices.” –CNBC in 2012

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

iCloud Core Data with iCloud in 3 steps 1. Add iCloud to Core Data 2. Respond to changes 3. Respond to account changes

iCloud Adding iCloud to Core Data NSDictionary *options = @{ NSPersistentStoreUbiquitousContentNameKey : @"name" } ! [persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:url options:options error:&error];

iCloud Responding to changes NSPersistentStoreDidImportUbiquitousContentChangesNotification ! ! [moc performBlockAndWait:^{ [moc mergeChangesFromContextDidSaveNotification:notification]; }];

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]; }];

iCloud Responding to account changes NSPersistentStoreCoordinatorStoresDidChangeNotification ! ! dispatch_sync(dispatch_get_main_queue(), ^{ // Update UI });


The App Store Receipt

“This is doable.” –James Wilson (Engineering Manager for the App Store in OS X) at WWDC 2013, about verifying the App Store receipt

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)

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->; data = [NSData dataWithBytes:octets->data length:octets->length]; } } PKCS7_free(p7);

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();

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; } }];

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];

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; } }];


About me Jordi Giménez • CTO at Mobile Jazz • Co-organizer of NSBarcelona • iOS and Android developer • High-availability, high-scalability • IT Security

Speech Synthesis with AV Foundation AV Foundation framework provides essential services for working with time-based audiovisual media. Play, capture, edit, or encode media.

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];

JavaScriptCore Evaluate JavaScript in your iOS applications

JavaScriptCore • • • • New Objective-C interface Allows Objective-C Language Binding Good for JSON parsing/transformation Platform independent code

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];

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]];

JavaScript Execution // declare a function as an Objective-C block context[@"square"] = ^(int x) { return x*x; };

Networking APIs

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

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

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); } }

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); } }

Multitasking Background Transfer Service Transferring files can be a problem: • Intermittent connectivity • User switching applications • Network conditioned operations (eg. wifi only)

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

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


AirDrop AirDrop lets users share photos, documents, URLs (including custom schemes), and other kinds of data via Wifi/Bluetooth ! (See Apple’s AirDropSample)

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

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.

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; }

Multipeer connectivity

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


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

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); }

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]; } }

Wrap up • Speech synthesis • JavaScript evaluation • Networking in the background • Background fetch • Remote notification background mode • Background Transfer Service • AirDrop & Multi-peer connectivity • iBeacons

So… What’s new in iOS 7? OK, you want the full list • • WhatsNewIniOS/Article

Thank you! ! Check out our sample code at: Hermes Pique! @hpique Jordi Giménez!

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