Cross platform mobile development with Xamarin

A talk I gave at CocoaHeads Copenhagen in June 2015.

Transcript

1. CROSS PLATFORM MOBILE DEVELOPMENT WITH XAMARIN MARCIN KUPTEL
3. NOT IDEAL ▸ Double the amount of work ▸ More developers required ▸ Changes need to be made in multiple places
4. CAN WE DO BETTER?
7. XAMARIN STUDIO
8. BUT WHAT ABOUT THE UI? ▸ Either use Xamarin Designer ▸ Or stick with Interface Builder!
9. PROFILING TOOLS ▸ HeapShot - Xamarin's own memory and performance tool ▸ Xamarin Profiler
10. C# ▸ generics ▸ lambda expressions ▸ optionals
11. C# USES GARBAGE COLLECTION
12. HOW DO C# AND OBJECTIVE C WORK TOGETHER?
13. GOTCHA NO. 1 UIIMAGE
14. THE DISPOSE PATTERN
15. IOS C# ➡ ARM ASSEMBLY ANDROID C# ➡ IL ➡ ASSEMBLY AT RUNTIME
16. All IOS FRAMWORKS ARE AVAILABLE
17. ... WITH A FEW DIFFERENCES ▸ Strongly typed arrays instead of NSArray ▸ Delegate methods exposed through events and properties ▸ NSString becomes string
18. GOTCHA NO. 2 UITableViewDelegate and UITableViewDataSource are classes
19. THIRD PARTY LIBRARIES ▸ NuGet is a package manager built into Xamarin Studio ▸ Over 37,000 libraries ▸ Notifies you when a library has been updated ▸ You can easily publish your own
20. BINDING PROJECTS
21. API DEFINITION namespace Cocos2D { [BaseType (typeof (NSObject))] interface Camera { [Static, Export ("getZEye")] nfloat ZEye { get; } [Export ("restore")] void Restore (); ... } }
22. SHARING CODE
23. SHARED PROJECT #if __IOS__ nsDispatcher.BeginInvokeOnMainThread(NotifyListeners); #elif __ANDROID__ Dispatcher.RunOnUiThread(() => NotifyListeners()); #endif
24. PORTABLE CLASS LIBRARY
25. OUR PROJECTS
26. SHARING ASSETS
27. CONTINUOUS INTEGRATION /Applications/Xamarin\ Studio.app/Contents/MacOS/mdtool -v build “--configuration:Release|iPhone” app/MyAwesomeApp.sln UNFORTUNATELY IT IS NOT POSSIBLE TO BUILD WITHOUT CODE-SIGNING security unlock-keychain -pPASSWORD ~/Library/Keychains/login.keychain
28. NUNIT FOR UNIT TESTING [TestFixture] public class LoginViewModelTests { [Test] public void TestThatLoginViewModelCanBeCreated() { Mock<IAccountApi> mockAccount = new Mock<IAccountApi>(); Mock<IDialogService> dialogServiceMock = new Mock<IDialogService>(); ... Assert.IsNotNull(viewModel); }
29. THE VERDICT ! Very easy to share code between platforms ! Good support from Xamarin ! Not enough iOS open source projects ! Xamarin Studio issues
30. THANKS! @MARCINKUPTEL