What’s new in iOS 7?Highlights of 1500 new APIs

Jordi Gimenez (@gimix3) & Hermes Pique (@hpique) NSBarcelona

As measured by the App Store during a 7-day period ending February 23, 2014.

82% of devices are using iOS 7.

Agenda

• NSTextStorage • UIViewController transitions • iCloud & Core Data • App Store Receipt • Speech Synthesis • JavaScript Evaluation • New Networking Possibilities

What we will cover

NSTextStorage

Text Kit

Core Text

Core Graphics

Text Kit

UILabel UITextView UITextField

Text KitClasses

NSTextStorage

What? (text & attributes)

NSLayoutManager

How? (glyphs & location)

NSTextContainer

Where? (areas)

Text KitUse 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 KitNSTextStorage

- (void)processEditing { [_backingStore beginEditing]; // Custom editing [_backingStore endEditing]; [super processEditing]; }

• NSMutableAttributedString subclass • Subclass to provide custom editing

Text KitUsing 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]; ! }]; }

Demo

github.com/NSBarcelona/CandyCrushKeyboard

UIViewController Transitions

UIViewController Transitions

• Presentations and dismissals • UINavigationController • UITabBarController • UICollectionViewController layout-to-layout

Customizable transitions

Container view

View B

UIViewController TransitionsThe container view

UIViewController A UIViewController B

View A

UIViewController TransitionsReturning 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 TransitionsAnimating 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]; }]; }

Demo

github.com/NSBarcelona/Transictures

Adding iCloud to Core Data

–CNBC in 2012

“…the average [US] household has 1.6 Apple devices.”

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

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

Core Data with iCloud in 3 steps

iCloudAdding iCloud to Core Data

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

iCloudResponding to changes

NSPersistentStoreDidImportUbiquitousContentChangesNotification !![moc performBlockAndWait:^{ [moc mergeChangesFromContextDidSaveNotification:notification]; }];

iCloudResponding 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]; }];

iCloudResponding to account changes

NSPersistentStoreCoordinatorStoresDidChangeNotification !!dispatch_sync(dispatch_get_main_queue(), ^{ // Update UI });

Demo

github.com/NSBarcelona/CloudPhotos

The App Store Receipt

–James Wilson (Engineering Manager for the App Store in OS X) at WWDC 2013, about verifying the App Store receipt

“This is doable.”

App Store Receipt

1. Get the receipt data 2. Verify the receipt signature 3. Get the receipt fields 4. Verify the receipt hash 5. Get in-app purchases (optional)

Verification in 5 steps

App Store ReceiptGetting 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);

App Store ReceiptVerifying 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 ReceiptGetting 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 ReceiptVerifying 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 ReceiptGetting 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; } }];

Demo

github.com/robotmedia/RMStore

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 FoundationAV Foundation framework provides essential services for working with time-based audiovisual media.

Play, capture, edit, or encode media.

AV Foundation

• AVFoundation allows provides a convenient interface to the speech synthesizer

Speech synthesis

AVSpeechSynthesizer *synthesizer = [AVSpeechSynthesizer new]; AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:@"Hello world!"]; [synthesizer speakUtterance:utterance];

JavaScriptCoreEvaluate 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

// 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); } }

Background fetch: wake up at intervals

Multitasking

// 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); } }

Remote notifications: wake up on server demand

Multitasking

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

Background Transfer Service

Multitasking

Uploads/downloads files even if the application is in background !

1. Make an NSURLSession with the desired NSURLSessionConfiguration 2. Provide a session identifier and delegate 3. Initiate a task 4. Delegate methods will be called upon progress/completion

Background Transfer Service

Multitasking

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

Background Transfer Service

AirDrop

AirDrop

AirDrop lets users share photos, documents, URLs (including custom schemes), and other kinds of data via Wifi/Bluetooth

!

(See Apple’s AirDropSample)

AirDrop

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

Sending a file

AirDrop

• 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.

Receiving a file

AirDrop

// 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; }

Receiving a file

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

• 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

// 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); }

Listen for iBeacons

iBeacons

// 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]; } }

Advertising your iDevice

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?

• https://developer.apple.com/ios7/ • https://developer.apple.com/library/prerelease/ios/releasenotes/General/

WhatsNewIniOS/Article

OK, you want the full list

Thank you! !

Check out our sample code at: github.com/nsbarcelona

Hermes Pique!@hpique

Jordi Giménez!jordi@mobilejazz.cat