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Xamarin Blueprints

You're reading from   Xamarin Blueprints Leverage the power of Xamarin to create stunning cross-platform and native apps

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Product type Paperback
Published in Sep 2016
Publisher Packt
ISBN-13 9781785887444
Length 516 pages
Edition 1st Edition
Languages
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Author (1):
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Michael Williams Michael Williams
Author Profile Icon Michael Williams
Michael Williams
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Table of Contents (9) Chapters Close

Preface 1. Building a Gallery Application FREE CHAPTER 2. Building a SpeechTalk Application 3. Building a GPS Locator Application 4. Building an Audio Player Application 5. Building a Stocklist Application 6. Building a Chat Application 7. Building a File Storage Application 8. Building a Camera Application

A cleaner code approach to NSLayout


On our previous screen, we built a very simple user interface using NSLayoutContraints.

Would you agree that the code looked quite clunky?

With our AudioPlayerPage, we are going to use a cleaner approach to coding the NSLayoutConstraints. Firstly, create a new folder called Extras, and add a new file called DictionaryViews.cs:

This class is going to inherit the IEnumerable interface in order to create an NSDictionary; part of this interface is we must specify the GetEnumerator function. It will pull this from the NSDictionary; we also have our Add function, which simply adds a new UIView to the dictionary. Then we have the static implicit operator which will return the object as an NSDictionary (this is used so we can directly pass the object as an NSDictionary to the FromVisualLayout function):

public class DictionaryViews : IEnumerable 
    { 
        private readonly NSMutableDictionary _nsDictionary; 
 
        public DictionaryViews() 
        { 
   ...
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