C# On The iPhone with MonoTouch at DDD8

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Slide 1: C# on the iPhone with MonoTouch Chris Hardy follow on Twitter - @chrisntr Slide 2: http://greatfridays.com Slide 3: Covering... • What is MonoTouch? • How does it work? • Why would you use it? • Demos Slide 4: Starting point.... Slide 5: Objective C and Xcode Slide 6: Learn to read Objective-C Slide 7: Learn to read Objective-C • All Apple documentation is in Obj-C • Most examples are in Obj-C • It’s not too hard to understand • It might even be fun... Slide 8: What is MonoTouch? Slide 9: What is Mono? Slide 10: What is Mono? Open Source .Net Implementation of the Microsoft .Net Framework Slide 11: Mono’s JIT Engine Memory Mono CIL Slide 12: Apple No No... • Contractual Requirements • No interpreted code • No shared libraries • Kernel Limitations • iPhone OS 2.0+ disables JIT Slide 13: Mono’s AOT Engine Native Code Mono AOT CIL Mono Runtime ARM Slide 14: • mtouch • MonoDevelop iPhone Add-In • CocoaTouch.NET • Full static AOT compiler • Support for all your existing code • Reﬂection • Generics • LINQ • Anonymous Methods • Lambda’s etc... Monotouch Features Slide 15: MonoTouch’s APIs Slide 16: The Bindings • MonoTouch namespace • MonoTouch.Foo namespace • Maps to CocoaTouch’s Foo Framework • 1:1 Mapping of classes. • MonoTouch.UIKit.UILabel • CocoaTouch’s UIKit framework, UILabel class Slide 17: Strong Types • Objective-C • Arrays are weakly typed: • NSArray return values. • MonoTouch has strong types • UIView[] Subviews { get; } • vs • NSArray subviews; • Intellisense - explore the API... Slide 18: Garbage Collection • • Automatic: • Mono’s GC will collect objects on demand Deterministic: • • Use when you need control. Every object in MonoTouch implements IDisposable using (var image = UIImage.FromFile(“foo.png”)){ surface.DrawImage(image, 20, 20); } Slide 19: Linker Slide 20: What about App Size? • 10 MB (compressed) limit on 3G/Edge downloads • .Net BCL and other libraries are huge • Mono Linker to the rescue! Slide 21: Linking Assemblies Slide 22: Linker Options • No Link • Link SDK Only • Full Link Slide 23: Pipeline • Interface Builder GUI Designer • Exact same tool used by Xcode • Support for existing Xcode interfaces • MonoDevelop IDE Slide 24: Integration • Tight integration between MD and IB • IB produces XIBs with MD parses • Automatic class generation in MD • Generates partial classes for all types, outlets and actions deﬁned in Interface Builder Slide 25: Outlets • Instance Variables • Can be strong or loosely typed • MD will strong type Slide 26: Actions • Objects emit broadcast messages to receivers • You can do this C# • MonoDevelop takes care of the details for you • Creates partial methods for you extend Slide 27: MonoTouch Events • Supports Objective-C pattern: webView.Delegate = new MyWebViewDelegate(); • C# style events as well: webView.PageLoaded += delegate { HideSpinningWheel(); } Slide 28: Debugging • Console.WriteLine(“Debugging inside of MonoTouch”); • printf(“I made it to this line!\n”) Slide 29: Well... • MonoTouch released around 15th September 2009 • MonoTouch 1.1 on 2nd October 2009 • MonoTouch 1.2 (Beta) released on 28th • Currently on MonoTouch 1.4.5 October 2009... With Debugging support Slide 30: Debugger • MonoTouch debugger leverages Mono’s new Soft-Debugger • Supports the Simulator • Supports the Device... • even over WiFi Slide 31: Debugger Features • Breakpoints • Catchpoints • Inspection • Watches • Immediate / Expression Evaluator • Call Stack • Stepping Slide 32: Caveats • Debug binaries on devices are very large • Cannot debug Main or FinishedLaunching on device • Consumes more memory runtime • Performance hit Slide 33: Getting started • Get iPhone SDK from Apple • Get Mono from Novell • Get MonoTouch (evaluation version is free) • Get MonoDevelop • Register with Apple iPhone Developer Program and purchase MonoTouch for putting apps on device and AppStore. Slide 34: One more thing... Slide 35: iPad • But you want to develop for the iPad... • 24 Hours after the SDK was released... • MonoTouch support for iPad Slide 36: Demo time... Slide 37*: Q +A twitter.com/chrisntr chrisntr@gmail.com