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Grant Spencer
5 years ago
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2 Xamarin + Xamarin.Forms Traditional Xamarin approach With Xamarin.Forms: more code-sharing, native controls Shared UI Code 2

3 4/25/15 Metroon for ios 2014 X amarin. All rights r eserved. 3

4 What s Included Shared UI Code Standard Controls Flexible Layout Multi- Page Navigation Custom Controls XAML Data Binding Engine 4

5 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 5

Layouts Stack Absolute Relative Grid ContentView ScrollView Frame Controls ActivityIndicator BoxView Button DatePicker Editor Entry Image Label

6 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 6

7 ContentPage Content property Control 7

8 ContentPage Content property Control Layout Children Control Control Control Control Demonstration 8

9 Controls expose properties to alter visualization var entry = new Entry { Placeholder = "Enter text", Keyboard = Keyboard. }; entry.textchanged += (sender, e) => { // Input changed }; Controls expose events to provide interactive behavior Demonstration 9

10 > toolable > human readable > extensible 10

11 shared UI and code XAML file (UI) C# file (behavior) Disclosure arrow collapses the C# file and indicates these files go together 11

12 XML based: case sensitive, open tags must be closed, etc. Element tags create objects Child nodes are used to establish relationships <?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> Attributes set properties 12

13 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 { private Entry PhoneNumber;.cs }... field is created for you and is hidden away in another file 13

14 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 14

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19 Demonstration 19

20 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(); 20

21 Advanced Navigation Editing of stack beyond push/pop Remove Page InsertPageBefore NavigationStack[] Disable animations Push/Pop RemovePage InsertPageBefore 21

22 Demonstration Summary 22

com/guides/cross-platform/xamarin-forms/ XAML Documentation

23 4/25/15 Get the book Charles Petzold Xamarin Resources Documentation XAML Documentation orms/ Samples X amarin. All rights r eserved. 23

We re here to help. Erik Polzin. Colby Williams. Engineer Partner Team. Director Partners and Channels. +1 (415)

We re here to help. Erik Polzin. Colby Williams. Engineer Partner Team. Director Partners and Channels. +1 (415) We re here to help Erik Polzin Colby Williams Director Partners and Channels Engineer Partner Team erik@xamarin.com +1 (415) 547-0830 @epolzin colby@xamarin.com +1 (918) 671-5167 @colbylwilliams Xamarin