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These are confidential sessions—please refrain from streaming, blogging, or taking pictures Making a great impression with every launch Session 225 Up and Running Jim Turner iOS Frameworks

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application:didFinishLaunchingWithOptions:

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Demo Brandon Newendorp iOS Software Engineer

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I see what you did there Watchdog

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I see what you did there Watchdog

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I see what you did there Watchdog

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Ensures app launch time Exception Type: 00000020 Exception Codes: Highlighted Thread: 0 Application Specific Information: com.your.app.id failed to launch in time Elapsed total CPU time (seconds): 11.120 (user 1.840, system 9.280), 59% CPU Elapsed application CPU time (seconds): 2.160, 12% CPU I see what you did there Watchdog 0x8badf00d

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I see what you did there Watchdog 0x8badf00d

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I see what you did there Watchdog

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I see what you did there Watchdog

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I see what you did there Watchdog

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Demo App Startup

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Interface Demo App Startup

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Interface Network Demo App Startup

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Interface Network Database Demo App Startup

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Interface Network Database Payload Demo App Startup

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Interface Network Database Payload External Library Demo App Startup

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Interface Network Database Payload External Library Demo App Startup Core Location iAd Options Processing

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Demo App Startup Main Queue

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Demo App Startup Main Queue application:didFinishLaunchingWithOptions:

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Demo App Startup Network Interface Database External Library  Payload Main Queue

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Demo App Startup Network Interface Database External Library  Payload Main Queue 5 seconds

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Demo App Startup Network Interface Database External Library  Payload Main Queue 5 seconds That’s not good

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Put your UI on a diet Interface Loading

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Put your UI on a diet Interface Loading •Eases creation

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Put your UI on a diet Interface Loading •Eases creation •Allows experimentation

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Put your UI on a diet Interface Loading •Eases creation •Allows experimentation •Reduces code

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Put your UI on a diet Interface Loading •Eases creation •Allows experimentation •Reduces code •However…

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Put your UI on a diet Interface Loading •Eases creation •Allows experimentation •Reduces code •However… ■ Must instantiate entire object graph

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Put your UI on a diet Interface Loading •Eases creation •Allows experimentation •Reduces code •However… ■ Must instantiate entire object graph ■ Main queue

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Put your UI on a diet Interface Loading •Eases creation •Allows experimentation •Reduces code •However… ■ Must instantiate entire object graph ■ Main queue ■ Side effects

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Storyboards Interface Loading

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Storyboards Interface Loading •Preferred to xib

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Storyboards Interface Loading •Preferred to xib •Single file

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Storyboards Interface Loading •Preferred to xib •Single file •Tool/Framework support

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Storyboards Interface Loading •Preferred to xib •Single file •Tool/Framework support •Simplify

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Demo App Startup Network Database External Library  Payload Main Queue Interface

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Demo App Startup Network Database External Library  Payload Main Queue

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Demo App Startup Network Database Payload Main Queue External Library 

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Demo App Startup Network Database Payload Main Queue External Library 

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Time does not pass in The Waiting Place Network Communication

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Time does not pass in The Waiting Place Network Communication •Undefined behavior

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Time does not pass in The Waiting Place Network Communication •Undefined behavior •Blocking vs. non-blocking

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Time does not pass in The Waiting Place Network Communication •Undefined behavior •Blocking vs. non-blocking •Applies to all synchronous methods/behaviors

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Network Communication _XMLparser = [[NSXMLParser alloc] initWithContentsOfURL:…]; NSData *imgData = [NSData dataWithContentsOfURL:…]; UIImage *img = [UIImage imageWithData:imgData]; NSData *formResults = [NSURLConnection sendSynchronousRequest:req returningResponse:nil error:&error];

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Network Communication _XMLparser = [[NSXMLParser alloc] initWithContentsOfURL:…]; NSData *imgData = [NSData dataWithContentsOfURL:…]; UIImage *img = [UIImage imageWithData:imgData]; NSData *formResults = [NSURLConnection sendSynchronousRequest:req returningResponse:nil error:&error];

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Network Communication _XMLparser = [[NSXMLParser alloc] initWithContentsOfURL:…]; NSData *imgData = [NSData dataWithContentsOfURL:…]; UIImage *img = [UIImage imageWithData:imgData]; NSData *formResults = [NSURLConnection sendSynchronousRequest:req returningResponse:nil error:&error];

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Network Communication _XMLparser = [[NSXMLParser alloc] initWithContentsOfURL:…]; NSData *imgData = [NSData dataWithContentsOfURL:…]; UIImage *img = [UIImage imageWithData:imgData]; NSData *formResults = [NSURLConnection sendSynchronousRequest:req returningResponse:nil error:&error];

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Network Communication Downloads Current Info JSON Image Image Article Data Twitter [614 KB] [22 KB] [17.9 MB] [12.2 MB] [4.8 MB] [977 KB] Finished waiting… waiting… waiting… waiting… waiting…

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Network Communication Downloads Current Info JSON Image Image Article Data Twitter [614 KB] [22 KB] [17.9 MB] [12.2 MB] [4.8 MB] [977 KB] Finished waiting… waiting… waiting… waiting… waiting…

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Network Communication Downloads Current Info JSON Image Image Article Data Twitter [614 KB] [22 KB] [17.9 MB] [12.2 MB] [4.8 MB] [977 KB] Finished waiting… waiting… waiting… waiting… waiting… Main Queue

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Network Communication _XMLparser = [[NSXMLParser alloc] initWithContentsOfURL:…]; NSData *imgData = [NSData dataWithContentsOfURL:…]; UIImage *img = [UIImage imageWithData:imgData]; NSData *formResults = [NSURLConnection sendSynchronousRequest:req returningResponse:nil error:&error];

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Network Communication dispatch_async(serialQueue, ^{ _XMLparser = [[NSXMLParser alloc] initWithContentsOfURL:…]; NSData *imgData = [NSData dataWithContentsOfURL:…]; UIImage *img = [UIImage imageWithData:imgData]; NSData *formResults = [NSURLConnection sendSynchronousRequest:req returningResponse:nil error:&error]; });

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Network Communication dispatch_async(serialQueue, ^{ _XMLparser = [[NSXMLParser alloc] initWithContentsOfURL:…]; NSData *imgData = [NSData dataWithContentsOfURL:…]; UIImage *img = [UIImage imageWithData:imgData]; NSData *formResults = [NSURLConnection sendSynchronousRequest:req returningResponse:nil error:&error]; });

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Network Communication Downloads Current Info JSON Image Image Article Data Twitter [614 KB] [22 KB] [17.9 MB] [12.2 MB] [4.8 MB] [977 KB] Finished waiting… waiting… waiting… waiting… waiting… Main Queue

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Network Communication Downloads Current Info JSON Image Image Article Data Twitter [614 KB] [22 KB] [17.9 MB] [12.2 MB] [4.8 MB] [977 KB] Finished waiting… waiting… waiting… waiting… waiting… Main Queue

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Background Queue Network Communication Downloads Current Info JSON Image Image Article Data Twitter [614 KB] [22 KB] [17.9 MB] [12.2 MB] [4.8 MB] [977 KB] Finished waiting… waiting… waiting… waiting… waiting…

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Background Queue Network Communication Downloads Current Info JSON Image Image Article Data Twitter [614 KB] [22 KB] [17.9 MB] [12.2 MB] [4.8 MB] [977 KB] Finished waiting… waiting… waiting… waiting… waiting…

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Network Communication Downloads Current Info JSON Image Image Article Data Twitter [614 KB] [22 KB] [17.9 MB] [12.2 MB] [4.8 MB] [977 KB] Finished waiting… waiting… waiting… waiting… Background Queue

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Network Communication _XMLparser = [[NSXMLParser alloc] initWithContentsOfURL:…]; NSData *imgData = [NSData dataWithContentsOfURL:…]; UIImage *img = [UIImage imageWithData:imgData]; NSData *formResults = [NSURLConnection sendSynchronousRequest:req returningResponse:nil error:&error];

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dispatch_async(concurrentQueue, ^{ _XMLparser = [[NSXMLParser alloc] initWithContentsOfURL:…]; }); dispatch_async(concurrentQueue, ^{ NSData *imgData = [NSData dataWithContentsOfURL:…]; UIImage *img = [UIImage imageWithData:imgData]; }); dispatch_async(concurrentQueue, ^{ NSData *formResults = [NSURLConnection sendSynchronousRequest:req returningResponse:nil error:&error]; }); Network Communication

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dispatch_async(concurrentQueue, ^{ _XMLparser = [[NSXMLParser alloc] initWithContentsOfURL:…]; }); dispatch_async(concurrentQueue, ^{ NSData *imgData = [NSData dataWithContentsOfURL:…]; UIImage *img = [UIImage imageWithData:imgData]; }); dispatch_async(concurrentQueue, ^{ NSData *formResults = [NSURLConnection sendSynchronousRequest:req returningResponse:nil error:&error]; }); Network Communication

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NSOperation Network Communication

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NSOperation Network Communication •Asynchronous

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NSOperation Network Communication •Asynchronous •Concurrent

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NSOperation Network Communication •Asynchronous •Concurrent •Tune resource usage

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NSOperation Network Communication •Asynchronous •Concurrent •Tune resource usage •Dependencies

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NSOperation Network Communication •Asynchronous •Concurrent •Tune resource usage •Dependencies •Cancellation

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Network Communication Downloads Current Info JSON Image Image Article Data Twitter [614 KB] [22 KB] [17.9 MB] [12.2 MB] [4.8 MB] [977 KB] Finished waiting… waiting… waiting… waiting… waiting… Main Queue

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Network Communication Downloads Current Info JSON Image Image Article Data Twitter [614 KB] [22 KB] [17.9 MB] [12.2 MB] [4.8 MB] [977 KB] Finished waiting… waiting… waiting… waiting… waiting… Main Queue

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Network Communication Downloads Current Info JSON Image Image Article Data Twitter [614 KB] [22 KB] [17.9 MB] [12.2 MB] [4.8 MB] [977 KB] Finished Processing Queue

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Network Communication Downloads Current Info JSON Image Image Article Data Twitter [614 KB] [22 KB] [17.9 MB] [12.2 MB] [4.8 MB] [977 KB] Finished Processing Queue

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Demo App Startup Network Database Payload Main Queue External Library 

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Demo App Startup Network Database Payload Main Queue External Library  Processing Queue

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Demo App Startup Main Queue Processing Queue Network Database Payload External Library 

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Demo App Startup Main Queue Processing Queue Network Database Payload External Library 

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Database Payload External Library

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Database Payload External Library

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Database Payload External Library •General processing

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Database Payload External Library •General processing •Need not block the app from launching

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Database Payload External Library •General processing •Need not block the app from launching •Parallelizable

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Database Payload External Library •General processing •Need not block the app from launching •Parallelizable •Dependent on the network

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General Processing stockDatabase = [[DBManager alloc] initWithDatabaseName:@"Stocks"]; [stockDatabase updateTickerData]; [stockDatabase updateSymbols]; xmlParser = [[NSXMLParser alloc] initWithData:dataFromServer]; [xmlParser parse];

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stockDatabase = [[DBManager alloc] initWithDatabaseName:@"Stocks"]; [stockDatabase updateTickerData]; [stockDatabase updateSymbols]; xmlParser = [[NSXMLParser alloc] initWithData:dataFromServer]; [xmlParser parse]; General Processing

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General Processing dispatch_async(concurrentQueue, ^{ stockDatabase = [[DBManager alloc] initWithDatabaseName:@"Stocks"]; [stockDatabase updateTickerData]; [stockDatabase updateSymbols]; }); xmlParser = [[NSXMLParser alloc] initWithData:dataFromServer]; [xmlParser parse];

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General Processing dispatch_async(concurrentQueue, ^{ stockDatabase = [[DBManager alloc] initWithDatabaseName:@"Stocks"]; [stockDatabase updateTickerData]; [stockDatabase updateSymbols]; }); xmlParser = [[NSXMLParser alloc] initWithData:dataFromServer]; [xmlParser parse];

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General Processing dispatch_async(concurrentQueue, ^{ stockDatabase = [[DBManager alloc] initWithDatabaseName:@"Stocks"]; [stockDatabase updateTickerData]; [stockDatabase updateSymbols]; }); xmlParser = [[NSXMLParser alloc] initWithData:dataFromServer]; [xmlParser parse];

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General Processing

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General Processing _operationQueue = [[NSOperationQueue alloc] init];

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General Processing _operationQueue = [[NSOperationQueue alloc] init]; [_operationQueue setName:@”Processing Queue”]; Processing Queue

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General Processing _operationQueue = [[NSOperationQueue alloc] init]; [_operationQueue setName:@”Processing Queue”]; NSOperation *networkOp = ... Processing Queue Network Operation Network Operation Network Operation

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Parse XML General Processing _operationQueue = [[NSOperationQueue alloc] init]; [_operationQueue setName:@”Processing Queue”]; NSOperation *networkOp = ... NSBlockOperation *xmlOp = [NSBlockOperation blockOperationWithBlock:^{...}]; Processing Queue Network Operation Network Operation Network Operation

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Parse XML General Processing _operationQueue = [[NSOperationQueue alloc] init]; [_operationQueue setName:@”Processing Queue”]; NSOperation *networkOp = ... NSBlockOperation *xmlOp = [NSBlockOperation blockOperationWithBlock:^{...}]; [xmlOp addDependency:networkOp]; Processing Queue Network Operation Network Operation Network Operation

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Parse XML General Processing _operationQueue = [[NSOperationQueue alloc] init]; [_operationQueue setName:@”Processing Queue”]; NSOperation *networkOp = ... NSBlockOperation *xmlOp = [NSBlockOperation blockOperationWithBlock:^{...}]; [xmlOp addDependency:networkOp]; [_operationQueue addOperation:xmlOp]; Processing Queue Network Operation Network Operation Network Operation

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General Processing Processing Queue Network Operation Network Operation Network Operation Parse XML _operationQueue = [[NSOperationQueue alloc] init]; [_operationQueue setName:@”Processing Queue”]; NSOperation *networkOp = ... NSBlockOperation *xmlOp = [NSBlockOperation blockOperationWithBlock:^{...}]; [xmlOp addDependency:networkOp]; [_operationQueue addOperation:xmlOp];

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General Processing Processing Queue Network Operation Network Operation Parse XML _operationQueue = [[NSOperationQueue alloc] init]; [_operationQueue setName:@”Processing Queue”]; NSOperation *networkOp = ... NSBlockOperation *xmlOp = [NSBlockOperation blockOperationWithBlock:^{...}]; [xmlOp addDependency:networkOp]; [_operationQueue addOperation:xmlOp];

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Network Operation General Processing Processing Queue Network Operation Parse XML _operationQueue = [[NSOperationQueue alloc] init]; [_operationQueue setName:@”Processing Queue”]; NSOperation *networkOp = ... NSBlockOperation *xmlOp = [NSBlockOperation blockOperationWithBlock:^{...}]; [xmlOp addDependency:networkOp]; [_operationQueue addOperation:xmlOp];

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Network Operation General Processing Processing Queue Network Operation Parse XML Slooow... _operationQueue = [[NSOperationQueue alloc] init]; [_operationQueue setName:@”Processing Queue”]; NSOperation *networkOp = ... NSBlockOperation *xmlOp = [NSBlockOperation blockOperationWithBlock:^{...}]; [xmlOp addDependency:networkOp]; [_operationQueue addOperation:xmlOp];

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Network Operation General Processing Processing Queue Network Operation Parse XML Slooow... Payload _operationQueue = [[NSOperationQueue alloc] init]; [_operationQueue setName:@”Processing Queue”]; NSOperation *networkOp = ... NSBlockOperation *xmlOp = [NSBlockOperation blockOperationWithBlock:^{...}]; [xmlOp addDependency:networkOp]; [_operationQueue addOperation:xmlOp];

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General Processing Processing Queue Network Operation Parse XML Slooow... Payload _operationQueue = [[NSOperationQueue alloc] init]; [_operationQueue setName:@”Processing Queue”]; NSOperation *networkOp = ... NSBlockOperation *xmlOp = [NSBlockOperation blockOperationWithBlock:^{...}]; [xmlOp addDependency:networkOp]; [_operationQueue addOperation:xmlOp];

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General Processing Processing Queue Network Operation Parse XML Slooow... _operationQueue = [[NSOperationQueue alloc] init]; [_operationQueue setName:@”Processing Queue”]; NSOperation *networkOp = ... NSBlockOperation *xmlOp = [NSBlockOperation blockOperationWithBlock:^{...}]; [xmlOp addDependency:networkOp]; [_operationQueue addOperation:xmlOp];

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General Processing Processing Queue Network Operation Parse XML Slooow... _operationQueue = [[NSOperationQueue alloc] init]; [_operationQueue setName:@”Processing Queue”]; NSOperation *networkOp = ... NSBlockOperation *xmlOp = [NSBlockOperation blockOperationWithBlock:^{...}]; [xmlOp addDependency:networkOp]; [_operationQueue addOperation:xmlOp];

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General Processing Processing Queue _operationQueue = [[NSOperationQueue alloc] init]; [_operationQueue setName:@”Processing Queue”]; NSOperation *networkOp = ... NSBlockOperation *xmlOp = [NSBlockOperation blockOperationWithBlock:^{...}]; [xmlOp addDependency:networkOp]; [_operationQueue addOperation:xmlOp];

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Demo App Startup Main Queue Processing Queue Network Database External Library  Payload

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Demo App Startup Main Queue Processing Queue Network Database External Library  Payload Much better

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?

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Highest Rated Popular Patti 6/5/12 Most Creative Creative Carl 6/5/12 Least Popular Sad Samantha 6/5/12 Top Trending Trendy Trent 6/5/12 ? ? ? ?

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Highest Rated Popular Patti 6/5/12 Most Creative Creative Carl 6/5/12 Least Popular Sad Samantha 6/5/12 Top Trending Trendy Trent 6/5/12 ? ? ? ? Highest Rated Popular Patti 6/5/12 Wow L. Micarel 6/3/12 Least Popular Sad Samantha 6/5/12 Frisbee N. Jones 6/1/12 ? ?

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Jump! W. Joseph 6/5/12 Wow L. Micarel 6/3/12 Seine J. Johnson 5/27/12 Frisbee N. Jones 6/1/12 Highest Rated Popular Patti 6/5/12 Most Creative Creative Carl 6/5/12 Least Popular Sad Samantha 6/5/12 Top Trending Trendy Trent 6/5/12 ? ? ? ? Highest Rated Popular Patti 6/5/12 Wow L. Micarel 6/3/12 Least Popular Sad Samantha 6/5/12 Frisbee N. Jones 6/1/12 ? ?

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What Remains

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What Remains

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What Remains

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What Remains

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State Restoration What Remains

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State Restoration What Remains •Save and restore application state

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State Restoration What Remains •Save and restore application state •New delegate method

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State Restoration What Remains •Save and restore application state •New delegate method application:didFinishLaunchingWithOptions:

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State Restoration What Remains •Save and restore application state •New delegate method

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State Restoration What Remains •Save and restore application state •New delegate method application:willFinishLaunchingWithOptions:

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State Restoration What Remains •Save and restore application state •New delegate method application:willFinishLaunchingWithOptions: Saving and Restoring Application State on iOS Russian Hill Thursday 3:15PM

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Demo Brandon Newendorp iOS Software Engineer

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Hint: He’s going to test Preventing Regressions

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Hint: He’s going to test Preventing Regressions •Be vigilant

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Hint: He’s going to test Preventing Regressions •Be vigilant •Automate performance testing

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Network Link Conditioner Preventing Regressions

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Wrap Up

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Wrap Up •“Do I need this here?”

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Wrap Up •“Do I need this here?” •Unneighborly network

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Wrap Up •“Do I need this here?” •Unneighborly network •Don’t abuse dispatch_async

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Wrap Up •“Do I need this here?” •Unneighborly network •Don’t abuse dispatch_async •What can you provide immediately?

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Related Session Saving and Restoring Application State on iOS Russian Hill Thursday 3:15PM

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More Information Jake Behrens UI Frameworks Evangelist [email protected] Documentation UIApplicationDelegate protocol Storyboards NSOperation and NSOperationQueue State Restoration http://developer.apple.com/ Apple Developer Forums http://devforums.apple.com

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