By Charles Petzold
Written through programming legend Charles Petzold and created together through Microsoft Press and Xamarin Inc., this Preview version booklet is ready writing purposes for Xamarin.Forms, the recent cellular improvement platform for iOS, Android, and home windows cell unveiled by way of Xamarin in may perhaps 2014. Xamarin.Forms helps you to write shared user-interface code in C# and XAML (the eXtensible program Markup Language) that maps to local controls on those 3 structures. (The ultimate variation of this publication can be released within the spring of 2015.) This publication is for C# programmers who are looking to write functions for the 3 hottest 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 take advantage of C# and the Xamarin.iOS and Xamarin.Android libraries to focus on the local program programming interfaces (APIs) of those structures. Xamarin.Forms could be a enormous assist in getting all started with those systems or in developing a prototype or proof-of-concept program. This publication assumes that you simply understand C# and feature a few familiarity with using the .NET Framework. although, whilst it describes a few C# and .NET beneficial properties that may be a little bit new to contemporary C# programmers, the booklet adopts a a bit of slower velocity. particularly, the advent of the async key-phrase and watch for operator in bankruptcy three follows a dialogue that indicates find out how to do asynchronous programming utilizing conventional callback equipment.
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Extra info for Creating Mobile Apps with Xamarin.Forms, Preview Edition
You can create a Color value in one of several ways. The three constructors are the easiest: • new Color(double grayShade) • new Color(double r, double g, double b) • new Color(double r, double g, double b, double a) Arguments can range from 0 to 1. FromHsla(double h, double s, double l, double a) The two static methods with integer arguments assume that the values range from 0 to 255, which is the customary representation of RGB colors. 0 to convert to double. Watch out! FromRgb(1, 0, 0) However, the C# compiler will assume that these arguments are integers.
Sometimes a little padding on the sides makes for a more attractive display. In Shared Asset Projects you can use the C# preprocessor directives #if and #elif as shown earlier, but the Device class has the advantage of working with both PCL projects and Shared Asset Projects. 3. Center the label within the page The problem with the text overlapping the iOS status bar only occurs because the text by default is displayed at the upper-left corner. Is it possible to center the text on the page? Forms supports a number of facilities to ease layout without requiring the program to perform calculations involving sizes and coordinates.
OnPlatform(20, 5, 5), 5, 5); } } Notice the use of embedded Unicode codes for opened and closed “smart quotes” (\u201C and \x201D) and the em-dash (\u2014). Padding has been set for 5 units around the page to avoid the text butting up against the edges of the screen, but the VerticalOptions property has been used as well to vertically center the entire paragraph on the page: For this paragraph of text, setting HorizontalOptions will shift the entire paragraph horizontally slightly to the left, center, or right.
Creating Mobile Apps with Xamarin.Forms, Preview Edition by Charles Petzold