Introduction to iPhone Software Development

Adrian Kosmaczewski

akosma software

akosma.com github.com/akosma linkedin.com/in/akosma formspring.me/akosma twitter.com/akosma slideshare.com/akosma

4 sections

1 History

2 Tools

3 Deployment

4 Demo

Questions

New to the iPhone?

New to the Mac?

Programming languages?

1 History

2 Tools

1 Objective-C

• “Thin OO layer around C” • Message-dispatch runtime • All objects created on the heap • Static and / or dynamic • The “real” inspiration for Java: • http://cs.gmu.edu/~sean/stuff/java- objc.html

Objective-C Java @interface & class (1 ﬁle) @implementation @protocol interface #import // ﬁles! import // classes! n/a (in C#, “class categories extensions”) n/a id (generics, void*)

Objective-C Java n/a @selector (delegates in C#) NSObject / Object NSProxy / ... @public / @protected / public / protected / @private private @try / @catch / @ﬁnally try / catch / ﬁnally NSException Exception n/a package / namespace

• Single inheritance + interfaces (“@protocols”) • @protocols can have optional methods • Fields protected by default • All methods are virtual and overridable

• Methods can be added to existing classes • Full introspection / reﬂection • Messages can be intercepted and forwarded à la AOP • “Objective-C++”

Highly Dynamic

Enable Warnings!

Memory Management

iPhone Speciﬁcs

128 or 256 MB RAM

~70 MB for the OS!

No swap ﬁle

No automatic objects on the stack (C++)

// C++ // Memory freed when out of scope std::string name(“test”); std::string *name = NULL; name = new std::string(“test”); delete name;

No (standard) Garbage Collection

“dealloc” called here http://cocoadevcentral.com/d/learn_objectivec/

Similar reﬂexes to C++

Memory Warnings

Syntax

Think Smalltalk

2 Cocoa Touch

Frameworks

3 Xcode

Minimalistic IDE

• C++, C, Objective-C, Ruby, Python, etc. • Limited “intellisense” • Flexible and customizable build system • “Targets”, “Conﬁgurations”

• Quality tools • Static analyzer • Unit testing • Instruments (Dtrace) • Shark (proﬁler)

Help Viewer

4 iPhone Simulator

Limitations

• CPU • ARM ≠ Intel Core Duo 2! • Accelerometer • http://www.vimov.com/isimulate/ • GPS • Always in Cupertino!

5 Interface Builder

GUI Builder

“nibs” / “xibs”

“Magic”

nib2objc

$ nib2objc DemoProjectViewController.xib

// (snip) UIBarButtonItem *view10 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:nil action:nil]; view10.frame = CGRectMake(0.0, 0.0, 0.0, 0.0); view10.enabled = YES; view10.style = UIBarButtonItemStyleDone; view10.tag = 0; view10.width = 0.000; UISearchBar *view13 = [[UISearchBar alloc] initWithFrame:CGRectMake(0.0, 44.0, 320.0, 44.0)]; view13.frame = CGRectMake(0.0, 44.0, 320.0, 44.0); view13.alpha = 1.000; view13.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleBottomMargin; view13.barStyle = UIBarStyleDefault; view13.clearsContextBeforeDrawing = YES; view13.clipsToBounds = NO; view13.contentMode = UIViewContentModeRedraw; view13.hidden = NO; view13.multipleTouchEnabled = YES; view13.opaque = NO; view13.showsBookmarkButton = NO; view13.showsCancelButton = NO; view13.tag = 0; view13.userInteractionEnabled = YES; UIView *view6 = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, 320.0, 460.0)]; view6.frame = CGRectMake(0.0, 0.0, 320.0, 460.0); view6.alpha = 1.000; view6.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

3 Deployment

2 Possibilities

1 App Store

2 Ad-Hoc

• Only for max. 100 devices • Per account, per year (!) • Requires “UDIDs” • Useful for testing before general availability • End user installs the application via iTunes (Windows or Mac)

Application ID Provisioning Proﬁle Device UDID

1. User provides UDID 2. Developer creates Provisioning Profile 3. Developer builds binary using the Provisioning Profile 4. Developer provides binary + Provisioning Profile to user

5. User drags and drops binary + provisioning proﬁle to iTunes 6. Plug device to USB cable 7. Sync device on iTunes 8. Done!

Weakest Link:

Getting the UDID

4 Demo

One more thing

Recommended Books

More about the iPhone in SDC

• “How to successfully deliver large iPhone projects on time and within budget” by Johan Sanneblad (16:00) • “Developing iPhone applications in .NET” by Paul Rayner (17:10)

Thanks!

Questions?

These slides are released under a Creative Commons Attribution-No Derivative Works 3.0 Unported License http://creativecommons.org/licenses/by-nd/3.0/

Introduction to iPhone Software Development

by Adrian Kosmaczewski on Mar 15, 2010

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Introduction to iPhone Software Development — Presentation Transcript