workshop-part2 introduction to xamarinsddconf.com/brands/sdd/library/xamarin_part_2.pdfxamarin +...

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1© 2014 Xamarin. All rights reserved.

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Xamarin + Xamarin.FormsWith Xamarin.Forms:

more code-sharing, native controlsTraditional Xamarin approach

Shared UI Code

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Metroon for iOS

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What’s Included

Shared UI Code

Flexible Layout

Standard Controls

Multi-Page

Navigation

Custom Controls

Data Binding Engine

XAML

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Platform-specific projects act as "host" to create native application

Portable Class Library or Shared Project used to hold shared code that defines UI and logic

Pages

Content MasterDetail Navigation Tabbed Carousel

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Layouts

Stack Absolute Relative Grid ContentView ScrollView Frame

Controls

ActivityIndicator BoxView Button DatePicker Editor

Entry Image Label ListView Map

OpenGLView Picker ProgressBar SearchBar Slider

Stepper TableView TimePicker WebView EntryCell

ImageCell SwitchCell TextCell ViewCell

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§§§

ContentPage

Control

Content property

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ContentPage

Layout

Content property

Control

Control

Control

Control

Children

Control

Demonstration

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var entry = new Entry{

Placeholder = "Enter text",Keyboard = Keyboard.Email

};

entry.TextChanged += (sender, e) => {// Input changed

};

Controls expose properties to alter visualization

Controls expose events to provide interactive behavior

Demonstration

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> toolable> human readable> extensible

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shared UI and code

•

XAML file (UI)

C# file (behavior)

Disclosure arrow collapses the C# file and indicates these files go together

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<?xml version="1.0" encoding="UTF-‐8" ?><ContentPage ...>

<StackLayout Padding="20" Spacing="10"><Label Text="Enter a Phoneword:" /><Entry Placeholder="Number" /><Button Text="Translate" /><Button Text="Call" IsEnabled="False" />

</StackLayout></ContentPage>

XML based: case sensitive, open tags must be closed, etc.

Element tags create objects

Attributes set properties

Child nodes are used to establish relationships

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public partial class MyPage : ContentPage{

public MyPage (){

InitializeComponent ();}

}

Constructor loads XML and creates UI from XAML

x:Name

<Entry x:Name="PhoneNumber" Placeholder="Number" /> .xaml

public partial class MainPage : ContentPage{

...}

.cs

field is created for you and is hidden away in another file

private Entry PhoneNumber;

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UI events handler

<Button Content="Translate" ...Clicked="OnTranslateClicked" />

.xaml

void OnTranslateClicked(object sender, EventArgs e){

Button button = (Button)sender;...

}

.cs

handler is not created for you .. must add this yourself!

Demonstration

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OR

OR

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Demonstration

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Basic Navigation

§ Root Page:§ NavigationPage – Gives each page an INavigation

§ Standard Navigation§ Navigation.PushAsync(page: nextPage);§ Navigation.PopAsync();

§ Modal Navigation§ Navigation.PushModalAsync(page: modalPage);§ Navigation.PopModalAsync();

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Advanced Navigation

§ Editing of stack beyond push/pop§ Remove Page§ InsertPageBefore§ NavigationStack[]

§ Disable animations

InsertPageBefore

RemovePagePush/Pop

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Demonstration

Summary

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Get the book

Charles PetzoldXamarin

Resources

§ Documentation§ http://developer.xamarin.com/guides/cross-platform/xamarin-forms/

§ XAML Documentation§ http://developer.xamarin.com/guides/cross-platform/xamarin-

forms/xaml-for-xamarin-forms/

§ Samples§ https://github.com/xamarin/xamarin-forms-samples

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