Xamarin Forms Toolbar

The Xamarin Forms Toolbar is an abstraction of the extensions you can add to the NavigationBar on each platform. ToolbarItems are the individual items you add to the NavigationBar. The difficult part with this abstraction, is the need for it to be separate or included in the navigation bar. In this post, I will go through how […]

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Xamarin Forms DataTemplateSelector

The DataTemplateSelector is a class that lets you change the data template you want to use, in a ListView or CarouselView, depending upon the type of data for each item, in the list. Rather than making a complex ViewCell or ItemTemplate, you can design each one specifically for the type of data you want. As […]

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WebView Rendering Engine Configuration

The WebView isn’t very configurable at the Xamarin Forms level, however each platform provides a large array of configuration settings for their native control. These settings are very different per platform, which makes it understandable, why they wouldn’t be configurable in a cross platform framework. An important thing to note, is the rendering enginer the […]

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Cookie Sharing with WebView and the Http Client

Despite their age, cookies remain just as relevant in today’s web as they were when originally introduced. The WebView will handle cookies similar to a regular browser. When making web calls via the native http client, this service also reads and stores cookies as you load webpages that contain them. Thankfully, UWP and iOS share […]

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Xamarin Forms Debugging The WebView In Chrome

A lesser known feature of debugging on Android, is that you can debug a WebView inside an Android app, in real time. This can be done on your desktop, via Chrome. It allows you to modify HTML and execute Javascript in real time, in the WebView on Android. WebView First, we can start out with […]

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Xamarin Forms WebView Executing Javascript

The existing WebView control has the function to run Javascript on the loaded page, however it doesn’t have the ability to return the value. This post will walk through how to add that functionality in a bindable property. Extend Control Extending from the base WebView, we add a Function called EvaluateJavascript, that takes a string, […]

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Xamarin Forms WebView Bindable Actions

The WebView has a number of functions and properties that are only available by directly accessing the control.  To maintain a clean code behind and call functions from the ViewModel, we need to create a new custom control that provides new bindable properties. Extended Control First, lets create a new custom control that inherits from […]

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Xamarin Forms WebView Advanced Series

The Xamarin Forms WebView control is an abstraction of the platform specific Android WebView, iOS UIWebView and UWP WebBrowser controls. It allows you to view HTML and run Javascript from a local or remote source. While the WebView seems like an odd control to have in a mobile app, it continues to serve a variety […]

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Xamarin Forms Pull To Refresh With ListView

The Xamarin Forms ListView control has the ability to allow the user to pull down from the top of the ListView to trigger a refresh command. I say a refresh command, because the pull to refresh, just triggers a command and you can do whatever you want in that command, including not updating the ListView. Properties […]

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Xamarin Forms Layout Engine, Under The Hood

Xamarin Forms has its own layout engine that calculates the position of elements on the screen, converting layout coordinates internally and passing them to the native controls for each platform. While the conversion from a Xamarin Forms control to a native control is easy to follow via a renderer, the layout engine is not as […]

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