Mobile Design Mobile Design PatternsPatternsBy Dan Hermes

dan@lexiconsystemsinc.comwww.lexiconsystemsinc.com

Boston Code Camp 21

Design PatternsDesign PatternsGang Of FourMVCMVVM

Adaptable, reusable code structures

Mobile Concepts and Mobile Concepts and PatternsPatternsUI

◦Visual Design PatternsData Access

◦ Local◦ Web Services◦ Data Binding◦ Data Synchronization

State ManagementThreadingMVC vs. MVVM

Visual Design PatternsVisual Design PatternsData PresentationNavigationSearch/SortDialogData Editing

Data Presentation Patterns

ListLayoutGridSubviewMaster/DetailGallery

Android List DemoAndroid List DemoArray AdapterBind to a Model

iOS List ExampleiOS List Example

Instantiate UITableView and add it to a view in the ViewDidLoad() method of the ViewController.

public override void ViewDidLoad()

{

base.ViewDidLoad();

UITableView table = new UITableView(View.Bounds);

Add (table);

}

iOS List Example – iOS List Example – Subclass Subclass UITableViewSourceUITableViewSourcepublic class ListSource : UITableViewSource

{

  protected string[] listItems;

protected string CellId= "TableCell";

  public ListSource (string[] items)

{ listItems = items; }

  public override int RowsInSection (UITableView tableview, int section)

{ return listItems.Length; }

public override UITableViewCell GetCell (UITableView tableView, MonoTouch.Foundation.NSIndexPath indexPath)

{ UITableViewCell cell = tableView.DequeueReusableCell (CellId);

if (cell == null) cell = new UITableViewCell (UITableViewCellStyle.Default, CellId);

cell.TextLabel.Text = listItems[indexPath.Row];

return cell;

}

}

iOS List ExampleiOS List Example

public override void ViewDidLoad()

{

base.ViewDidLoad();

UITableView table = new UITableView(View.Bounds);

var tableItems = new string[] {"First","Second","Third","Fourth","Fifth"};

table.Source = new ListSource(tableItems);

Add (table);

}

Navigation

Images courtesy of Mobile Design Pattern Gallery by Theresa Neil

More Navigation

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Forms

Images courtesy of Mobile Design Pattern Gallery by Theresa Neil

Style and DesignStyle and DesignWhy Does It Matter?

Style and DesignStyle and DesignForm follows function

◦What is your apps message?To the PointConsistency

" If it looks the same, it should act the same." - Android Style Guide

Style and DesignStyle and DesignDirect ManipulationFeedback Personal ServiceEncouragement

MobilismsMobilismsStandard icons Standard screen layoutsStandard multi-screen flowsUse labels sparinglyStandard multi-screen

approaches

Avoid PCisms

Images courtesy of Mobile Design Pattern Gallery by Theresa Neil

Idiot Box

Oceans of Buttons

Anti-Pattern Advice:

AVOID CREATIVITY

until you know mobile UI standards

Mobile Interaction ChartMobile Interaction ChartMobile Action PC

Tap I want this click

Submit Do it submit

Swipe Next! Move, or Delete

next

Press Do Something Double-click

Pinch Zoom out Roller/slider

Spread Zoom in Roller/slider

Rotate um, Rotate. Roller/slider

http://www.lexiconsystemsinc.com/

ViewsViewsXamarin.FormsAndroid ViewsiOS UIKit

Xamarin.Forms List DemoXamarin.Forms List Demo

Android: ActivitiesAndroid: Activities

An Activity is like a…

Code-Behind

iOS: ViewControllersiOS: ViewControllers

A ViewController is like a…

Code-Behind

UI - iOSUI - iOSViewControllerXcode or Xamarin iOS DesignerYou need a Mac

◦Mac Mini◦macincloud.com

Xamarin iOS DesignerXamarin iOS Designer

MVCMVCiOS ViewControllers Android ActivitiesAre they MVC?

Some CodeSome Code

MVCMVCModel

◦Can use themViews

◦Must use themControllers

◦Android Activities◦iOS ViewControllers

I WANT MY MVC!!!I WANT MY MVC!!!

The OptionsThe OptionsMVVM

◦MVVMcross◦MVVM Lite◦ReactiveUI

Roll Your Own MVC◦ Separate out your controller logic from

your Activities, ViewControllers, and Pages

Mobile Design Mobile Design PatternsPatternsDan HermesMobile Consultant

Lexicon Systems

Website: www.lexiconsystemsinc.comEmail: dan@lexiconsystemsinc.comPhone: 781-526-0738Twitter: @lexiconsystemsBlog: www.itshopkeeping.com