Say hello to Cocoa development with Xamarin.Mac

Session at MonkeyFest 2017 on Day 2 (23/09/2017), 16:00

Transcript

1. Say hello to Cocoa development with
   Xamarin.Mac
   MonkeyFest 2017 - Day 2
   Lifebear, Inc.
   Tsubasa HIRANO @ailen0ada
   

   View Slide

2. AGENDA
   • Introduction to Xamarin.Mac
   • Demo: Creating Mac App using Xamarin.Mac
   • Showcase: Porting Windows.Forms app into Mac App
   • Wrap-up
   

   View Slide

3. Xamarin.Mac
   • Full use of Mac APIs
   • JIT compiled to native code at run-time
   • side-by-side with the ObjC runtime
   • Mono runtime embedded into bundle
   • Allows the execution of dynamically
   generated code (in contrast to X.iOS)
   https://developer.xamarin.com/guides/mac/advanced_topics/mac-architecture/
   

   View Slide

4. The first Mac App
   • A textfield and a button
   • Click to show alert with contents of
   textfield
   

   View Slide

5. Cocoa Binding
   • Keeping model and view values
   synchronized without a lot of glue-code
   • NSObject could raise an alert such as
   INotifyPropertyChanged in XAML
   platforms
   • Only supported with Mac
   https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/CocoaBindings/Concepts/WhatAreBindings.html
   

   View Slide

6. Cocoa Binding Recipes
   1.Remove glue-code from our first Mac App
   2.Bind to property in ViewController
   3.Bind to properties in other class
   4.Bind to multiple values to select one of them
   

   View Slide

7. Cocoa binding basics
   NSString name;

   

   [Outlet]

   public NSString Name

   {

   get => name;

   

   set

   {

   this.WillChangeValue(nameof(Name));

   name = value;

   this.DidChangeValue(nameof(Name));

   }

   }

   

   View Slide

8. DataSource Pattern
   • Providing data by implementing a data source class
   • Permits fine control of populating rows and columns
   • Implement the NSTableViewDataSource and the
   NSTableViewDelegate protocols
   

   View Slide

9. DataSource Pattern Recipes
   1.Implementing ITableViewDataSource and ITableViewDelegate
   2.Recall previous value
   3.Sorting previous values with direction (time permits)
   

   View Slide

10. Summary of live coding
    • Constructing Mac App using Visual Studio
    • Cocoa Binding basics
    • WillChangeValue/DidChangeValue
    • Protocol in C#
    • INSTableViewDataSource/Delegate
    

    View Slide

11. Showcase:
    Gochiusearch
    A Fast Scene Search Engine for Anime
    Series 'Is the order a rabbit?’
    originally created with Windows.Forms
    ported to Cocoa with Xamarin.Mac
    published to MacAppStore
    • www.github.com/ksasao/Gochiusearch
    

    View Slide

12. Windows Forms
    • One of cross platform GUI framework
    • thanks to WinForms in Mono
    • Is the best solution for enterprise apps with common controls?
    

    View Slide

13. APPROACH
    1.Wash away platform dependent codes
    2.Construct user interface using XIB for supporting macOS 10.9
    3.Implement features using Full Desktop Mono
    4.Migrate core features to Xamarin.Mac Modern
    5.Submit to AppStore
    

    View Slide

14. Xamarin.Mac Modern
    • App runs on same tuned .NET framework used by X.iOS
    • Supporting a subset of the full Desktop framework
    • Linker behavior makes bundle size smaller
    • Could reference assemblies targeting netstandard>=1.0 or
    Xamarin.Mac20
    

    View Slide

15. Migrating core features
    Input image StoryInfo
    Load DB
    Read
    Image
    Resize
    Image
    Calculate
    Bit Vector
    Search DB
    ImageSearch assembly
    System.IO.FileStream
    System.Drawing.Bitmap
    System.Drawing.Rectangle
    System.Drawing.Graphics
    Platform independent
    

    View Slide

16. MIGRATING CORE FEATURE
    Input image StoryInfo
    Load DB
    Read
    Image
    Resize
    Image
    Calculate
    Bit Vector
    Search DB
    ImageSearch.Portable assembly
    PCLStorage Platform independent
    CoreGraphics
    ImageSearch platform impl
    Read
    Image
    

    View Slide

17. APP SANDBOXING
    • Required for any app distributed from Mac App Store
    • Modify App Sandbox Resources by editing Entitlements.plist
    • Sandbox Violation does not throw NotAuthorizedException
    • Type of exception depends on operation
    • To determine whether violation occurred or not, use Console app
    

    View Slide

18. Unleash the power of Xamarin.Mac
    • No simulator or tethered device needed
    • Cherry pick the best bits of .NET Framework and Cocoa
    • Consider whether sharing more code or writing convenient and/or
    efficient platform dependent code
    

    View Slide

19. THANKS
    • Twitter/Facebook/GitHub/Medium: ailen0ada (unreadable)
    • Today’s slide: https://speakerdeck.com/ailen0ada
    MonkeyFest 2017 was sponsored by
    

    View Slide