C# on the iPhone with MonoTouch Glasgow

C# on the iPhone with MonoTouch Chris Hardy follow on Twitter - @chrisntr

http://greatfridays.com

iPhone apps built with MonoTouch

iPad apps built with MonoTouch

Covering...

Covering... • How MonoTouch works...

Covering... • How MonoTouch works... • Why would you use it?

Covering... • How MonoTouch works... • Why would you use it? • Section 3.3.1 ...

Covering... • How MonoTouch works... • Why would you use it? • Section 3.3.1 ... • Demos

Starting point....

Objective C and Xcode

Learn to read Objective-C

Learn to read Objective-C • All Apple documentation is in Obj-C

Learn to read Objective-C • All Apple documentation is in Obj-C • Most examples are in Obj-C

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

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...

What is MonoTouch?

What is Mono?

What is Mono? The .Net Framework

Mono’s JIT Engine Memory Mono CIL

Apple No No... • Contractual Requirements • No interpreted code • No shared libraries • Kernel Limitations • iPhone OS 2.0+ disables JIT

Mono’s AOT Engine Native Code Mono AOT Mono Runtime CIL ARM

Monotouch Features • 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’s APIs

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

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...

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); }

Linker

What about App Size? • 20 MB (compressed) limit on 3G/Edge downloads • .Net BCL and other libraries are huge • Mono Linker to the rescue!

Linking Assemblies

Linker Options • No Link • Link SDK Only • Full Link

Pipeline • Interface Builder GUI Designer • Exact same tool used by Xcode • Support for existing Xcode interfaces • MonoDevelop IDE

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

Outlets • Instance Variables • Can be strong or loosely typed • MD will strong type

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

MonoTouch Events • Supports Objective-C pattern: webView.Delegate = new MyWebViewDelegate(); • C# style events as well: webView.PageLoaded += delegate { HideSpinningWheel(); }

Debugging • Console.WriteLine(“Debugging inside of MonoTouch”); • printf(“I made it to this line!n”)

Well...

Well... • MonoTouch 1.0 on 15th September 2009

Well... • MonoTouch 1.0 on 15th September 2009 • MonoTouch 1.1 on 2nd October 2009

Well... • MonoTouch 1.0 on 15th September 2009 • MonoTouch 1.1 on 2nd October 2009 • MonoTouch 1.2 (Beta) released on 28th October 2009... With Debugging support

Well... • MonoTouch 1.0 on 15th September 2009 • MonoTouch 1.1 on 2nd October 2009 • MonoTouch 1.2 (Beta) released on 28th October 2009... With Debugging support • Currently on MonoTouch 2.0.2

Debugger • MonoTouch debugger leverages Mono’s new Soft-Debugger • Supports the Simulator • Supports the Device... • even over WiFi

Debugger Features • Breakpoints • Catchpoints • Inspection • Watches • Immediate / Expression Evaluator • Call Stack • Stepping

Caveats • Debug binaries on devices are very large • Cannot debug Main or FinishedLaunching on device • Consumes more memory runtime • Performance hit

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.

iPad • But you want to develop for the iPad...

iPad • But you want to develop for the iPad... • 24 Hours after the SDK was released...

iPad • But you want to develop for the iPad... • 24 Hours after the SDK was released... • MonoTouch support for iPad

iPad • But you want to develop for the iPad... • 24 Hours after the SDK was released... • MonoTouch support for iPad • Fully supported with MonoTouch 2.0

Apple’s new TOS • 3.3.1 — Applications may only use Documented APIs in the manner prescribed by Apple and must not use or call any private APIs. Applications must be originally written in Objective-C, C, C++, or JavaScript as executed by the iPhone OS WebKit engine, and only code written in C, C++, and Objective-C may compile and directly link against the Documented APIs (e.g., Applications that link to Documented APIs through an intermediary translation or compatibility layer or tool are prohibited).

Professional iPhone Programming with MonoTouch and .NET/ C# Wallace B. McClure Rory Blyth Martin Bowling Craig Dunn and me... Chris Hardy Out in Summer

Demo time...

Q +A twitter.com/chrisntr chrisntr@gmail.com 10% off MonoTouch use DDDSCOT on MonoTouch.net

C# on the iPhone with MonoTouch Glasgow

by Chris Hardy on May 12, 2010

Accessibility

Categories

Tags

Upload Details

Usage Rights

2 Embeds 177

Statistics

C# on the iPhone with MonoTouch Glasgow — Presentation Transcript

http://weblogs.asp.net	172
http://www.slideshare.net	5