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CHARLES PETZOLD

Cross-platform C# programming

for iOS, Android, and Windows

Creating

Mobile Apps

with Xamarin.Forms

Celebrating over 30 years!

spine = 1.4063” (per RRDonnelly)

Creating Mobile Apps

with Xamarin.Forms

9781509302970_XamarinCreatingMobileApps_cover_alternate.indd 1 3/24/2016 12:03:49 PM

 
Contents 
Foreword ................................................................................................................................................................................................. xv 
Introduction.......................................................................................................................................................................................... xvi 
Chapter 1  How does Xamarin.Forms fit in?.............................................................................................. 1 
Cross-platform mobile development ...................................................................................................................................... 2 
The mobile landscape ............................................................................................................................................................... 2 
Problem 1: Different user-interface paradigms .............................................................................................................. 2 
Problem 2: Different development environments ......................................................................................................... 3 
Problem 3: Different programming interfaces................................................................................................................ 3 
Problem 4: Different programming languages .............................................................................................................. 3 
The C# and .NET solution ............................................................................................................................................................ 4 
A single language for all platforms ..................................................................................................................................... 5 
Sharing code ................................................................................................................................................................................. 6 
Introducing Xamarin.Forms ......................................................................................................................................................... 8 
The Xamarin.Forms option ...................................................................................................................................................... 8 
XAML support ............................................................................................................................................................................ 13 
Platform specificity ................................................................................................................................................................... 14 
A cross-platform panacea? ................................................................................................................................................... 15 
Your development environment ............................................................................................................................................. 15 
Machines and IDEs ................................................................................................................................................................... 16 
Devices and emulators ........................................................................................................................................................... 16 
Installation ........................................................................................................................................................................................ 17 
Creating an iOS app................................................................................................................................................................. 17 
Creating an Android app ....................................................................................................................................................... 18 
Creating a Windows app ....................................................................................................................................................... 18 
All ready?...................................................................................................................................................................................... 19 
   

Contents    iv 
 
Chapter 2  Anatomy of an app ................................................................................................................. 20 
Say hello ............................................................................................................................................................................................20 
Inside the files .................................................................................................................................................................................24 
The iOS project ...........................................................................................................................................................................26 
The Android project .................................................................................................................................................................27 
The Universal Windows Platform project ........................................................................................................................28 
Nothing special! .........................................................................................................................................................................28 
PCL or SAP? ......................................................................................................................................................................................29 
Labels for text ..................................................................................................................................................................................31 
Solution 1. Include padding on the page .......................................................................................................................35 
Solution 2. Include padding just for iOS (SAP only) ....................................................................................................36 
Solution 3. Include padding just for iOS (PCL or SAP) ...............................................................................................37 
Solution 4. Center the label within the page .................................................................................................................39 
Solution 5. Center the text within the label ....................................................................................................................41 
Chapter 3  Deeper into text ...................................................................................................................... 42 
Wrapping paragraphs ..................................................................................................................................................................42 
Text and background colors ......................................................................................................................................................44 
The Color structure .......................................................................................................................................................................46 
Changing the application color scheme ...............................................................................................................................50 
Font sizes and attributes .............................................................................................................................................................51 
Formatted text ................................................................................................................................................................................53 
Chapter 4  Scrolling the stack ................................................................................................................... 60 
Stacks of views ................................................................................................................................................................................60 
Scrolling content ............................................................................................................................................................................64 
The Expands option ......................................................................................................................................................................70 
Frame and BoxView ......................................................................................................................................................................74 
A ScrollView in a StackLayout? .................................................................................................................................................82 
Chapter 5  Dealing with sizes .................................................................................................................... 87 
Pixels, points, dps, DIPs, and DIUs ...............................................................................................................................................87 
Metrical sizes ...................................................................................................................................................................................96 

Contents    v 
 
Estimated font sizes ...................................................................................................................................................................... 97 
Fitting text to available size ....................................................................................................................................................... 99 
A fit-to-size clock........................................................................................................................................................................ 103 
Accessibility issues ...................................................................................................................................................................... 105 
Empirically fitting text ............................................................................................................................................................... 108 
Chapter 6  Button clicks ........................................................................................................................... 113 
Processing the click ........................................................................................................................................................................ 113 
Sharing button clicks ................................................................................................................................................................. 116 
Anonymous event handlers ................................................................................................................................................... 119 
Distinguishing views with IDs ................................................................................................................................................ 121 
Saving transient data ................................................................................................................................................................ 124 
Chapter 7  XAML vs. code ........................................................................................................................ 131 
Properties and attributes ......................................................................................................................................................... 132 
Property-element syntax ......................................................................................................................................................... 136 
Adding a XAML page to your project ................................................................................................................................ 140 
The XAML compiler ................................................................................................................................................................... 145 
Platform specificity in the XAML file ................................................................................................................................... 146 
The content property attribute ............................................................................................................................................. 150 
Formatted text ............................................................................................................................................................................. 152 
Chapter 8  Code and XAML in harmony ................................................................................................ 156 
Passing arguments ..................................................................................................................................................................... 156 
Constructors with arguments............................................................................................................................................ 156 
Can I call methods from XAML? ...................................................................................................................................... 159 
The x:Name attribute ................................................................................................................................................................ 161 
Custom XAML-based views .................................................................................................................................................... 167 
Events and handlers .................................................................................................................................................................. 172 
Tap gestures ................................................................................................................................................................................. 175 
Chapter 9  Platform-specific API calls .................................................................................................... 182 
Preprocessing in the Shared Asset Project ....................................................................................................................... 182 
Parallel classes and the Shared Asset Project .................................................................................................................. 185 