J.J. R.R.

227 Flips | 4 Magazines | 27 Likes | 1 Following | 2 Followers | @JR_Waitforit | Keep up with J.J. R.R. on Flipboard, a place to see the stories, photos, and updates that matter to you. Flipboard creates a personalized magazine full of everything, from world news to life’s great moments. Download Flipboard for free and search for “J.J. R.R.”

Passing Data on Navigation in Xamarin.Forms

A common issue in many Xamarin.Forms applications, is how to pass information from one page to another, during navigation. They are a few options, …

Multi-Select ListView

I was just hanging around in the IDE this week and I had a chat with ListView. He was a very nice guy, but he was complaining about the fact that for …

Xamarin Forms, the MVVMLight Toolkit and I: showing dialog messages

In this post, I will show you how to display dialog messages (also known as message box). This time, we will use again native implementations (like …

Software Development

The Main Reason Xamarin.Forms Apps Fail (And How To Avoid It)

We’ve been developing Xamarin.Forms apps since the framework’s inception and have watched the tool mature into a solid tool for building native, …

MultiSelect ListView in Xamarin.Forms

In a regular Xamarin.Forms ListView, you have the option to select one row at a time, but not multiple at a time. The ListView control itself, is not …

MVVM Cross with Xamarin.Platform – jump start

<b>Special post</b><p>This is special post because I will not publish content here on my blog. I created sample application and PDF document available on my …

Core ML and Vision: Machine Learning in iOS 11 Tutorial

<i>Note:</i> This tutorial requires Xcode 9 Beta 1 or later, Swift 4 and iOS 11.Machine learning is all the rage. Many have heard about it, but few know …

Machine Learning

MvvmLight Code Snippets for Visual Studio for Mac

I previously made a post about some Mvvm Light shortcuts / code snippets in Visual Studio, but what about Visual Studio for Mac?<p>Code snippets in …

Geolocation In Mobile Apps Using Xamarin

A- Geolocation Implementation In Xamarin:<p>Implementing geolocation requires taking advantage of device-specific location services which help provide a …

Get Long Press Gesture In Xamarin iOS

<b>Introduction</b><p>Xamarin is a platform to develop cross-platform and multi-platform apps (for example, Windows phone, Android and iOS). In Xamarin …

Swift Tricks: Searching for Objects by Type - don't panic

I was working on an app a few days ago, and managed to nerd snipe myself within a single line of Swift code. I thought it’d make a good short writeup.<p>…

XAML Standard : a set of principles that drive XAML dialect alignment

README.md<p>Updates:<p><i>Thank you for patiently bearing with us as we have been iterating over feedback and working to better define the principles for XAML</i> …

Xamarin.Forms XAML Techniques For Legible and Concise Code

In the last article we talked about how to add custom fonts to any Xamarin.Forms app.<p>Despite the numerous starts and stops that I encountered, the …

Software Development

From Idea To Development: How To Write Mobile Application Requirements That Work

Smashing Newsletter<p>Upgrade your inbox and get our editors’ picks twice a month.<p>With useful tips for web devs. Sent 2× a month.<br>You can unsubscribe any …

Xamarin Forms Best Practices | Xamarin Forms Tutorial

The Recap<p>This series of posts is devoted to all the things I wish I knew, as a long-time Microsoft Enterprise developer, before I provisioned my …

Handling non-optional optionals in Swift

Optionals are arguably one of the most important features of Swift, and key to what sets it apart from languages like Objective-C. By being forced to …

Tynker app teaches kids Apple Swift with coding games

Coding is as essential to our kids' education as math and history lessons, with tech leaders, presidents and coding organizations touting the importance of the skill. Learning how to create the stuff on which our modern society runs will ready future generations to make the things that the rest of …

JavaScript: Arrow Functions for Beginners

Last week I published this post on the keyword this for beginners. One of the topics that wasn’t covered in that article was arrow functions. The …

Free eBook: Top 10 Xamarin Tips and Traps

Xamarin is extremely powerful and useful in helping you create cross-platform mobile apps quickly and efficiently. It doesn’t matter whether you are …

Software Development

TDD in Xcode Playgrounds – Paul Ardeleanu’s Blog

The “magic sauce” here is the creation of a test suite for the XCTestCase subclass and running it.<p>TodoTests.defaultTestSuite().run()<p>The output will …

Object Oriented Tricks: #3 Death By Arguments

OOT is a mini series on writing maintainable Object Oriented code without pulling your hair out. Click here for trick #1, trick #2.<p>Arguments …

Introduction to functional programming with C#

It is no surprise that one of the biggest challenges in the enterprise software development is complexity. Change is inevitable. Especially when a …

Coffee Coding Series: Learn How a Mobile App is Built [Video]

You’ve probably heard the term “coding” once or twice. But what does it mean? And what does a “web developer” do? Something with the web, sure, but …

Using XAML in Xamarin.Forms

XAML or eXtensible Markup Language is a declarative language used for creating user interfaces in Xamarin.Forms.I already know what you're …

Software Development