By Charles Petzold
Written through programming legend Charles Petzold and created together through Microsoft Press and Xamarin Inc., this Preview version booklet is set writing functions for Xamarin.Forms, the hot cellular improvement platform for iOS, Android, and home windows cell unveiled through Xamarin in might 2014. Xamarin.Forms allows you to write shared user-interface code in C# and XAML (the eXtensible software Markup Language) that maps to local controls on those 3 systems. (The ultimate version of this e-book may be released within the spring of 2015.) This book is for C# programmers who are looking to write purposes for the 3 most well liked cellular platforms—iOS, Android, and home windows Phone—with a unmarried code base. Xamarin.Forms additionally has applicability for these programmers who wish ultimately to exploit C# and the Xamarin.iOS and Xamarin.Android libraries to focus on the local software programming interfaces (APIs) of those systems. Xamarin.Forms could be a titanic assist in getting began with those structures or in developing a prototype or proof-of-concept program. This e-book assumes that you just comprehend C# and feature a few familiarity with using the .NET Framework. in spite of the fact that, while it describes a few C# and .NET positive aspects that may be a bit of new to fresh C# programmers, the e-book adopts a slightly slower velocity. specifically, the advent of the async key-phrase and watch for operator in bankruptcy three follows a dialogue that indicates how one can do asynchronous programming utilizing conventional callback tools.
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Extra resources for Creating Mobile Apps with Xamarin.Forms, Preview Edition
These are often called controls or widgets in other programming environments. Forms application using a standard template. This process actually creates a solution that contains up to four projects: three platform projects for iPhone, Android, and Windows Phone, and a common project for the greater part of your application code. In Visual Studio, select the menu option File > New > Project. At the left of the New Project dialog, select Visual C# and then Mobile Apps. In Xamarin Studio, select File > New > Solution from the menu, and at the left of the New Solution dialog, select C# and then Mobile Apps.
Twenty what? you might ask. Twenty pixels? Actually no. Padding = new Thickness(0, 20, 0, 0); } } Now the greeting appears 20 units from the top of the page: 2. Include padding just for iOS Setting the Padding property on the ContentPage solves the problem of the text overwriting the iOS status bar, but it also sets the same padding on the Android and Windows Phone where it’s not required. Is there a way to set this padding only on the iPhone? Yes! OS property returns a member of the TargetPlatform enumeration: iOS, Android, WinPhone, or Other.
Each Span object is a uniformly formatted chunk of text that is governed by four properties: • Text • Font • ForegroundColor • BackgroundColor You can use the Greetings program to experiment with this. Large) }; } } Each Span is created and passed to the Add method of the Spans collection. However, it’s possible to initialize the contents of the Spans collection by following it with a pair curly braces. Within these curly braces the Span objects are instantiated. Large is referenced twice in the code.