\t\t\t\tAs we continue to pursue the best in stability and performance, we’re excited to get your feedback on our first pre-release of Xamarin.Forms 2.3.5. Boasting over 130 fixes and enhancements this release, I’d like to highlight a few that we’re most eager for you to explore: Fast Renderers, ListView enhancements, and macOS preview!<\/p>\n
The concept behind Fast Renderers is fairly simple: reduce inflation and rendering costs by flattening the control nesting. Simple almost always performs better! We’re delivering Button, Image, and Label in this first batch of optimized renderers. To use it, do nothing; they’re on by default in this pre-release.<\/p>\n
Our initial testing teases upwards of 2x speed improvement to render a view with these controls. Large ListView scrolling with cells of these controls was visibly smoother and recovered much faster when aggressively scrolling thousands of rows. What’s clear, and is no real surprise, is that hardware, OS version, and the complexity of the view are significant factors in how greatly this will impact your results.<\/p>\n
Join our performance discussion in the forums<\/a> and let us know your results. We’re also asking for XAML layout contributions to build up our performance test suite. We\u2019d love your participation!<\/p>\n We have more work to do performing this refactoring on the remaining controls for Android and iOS, but we’re excited to share what we have so far.<\/p>\n We continue to chip away at improving list performance. Fast Scroll on Android is now enabled by default and may be set using a Platform Specific.<\/p>\n If you\u2019re using a shared project like I am and have a namespace collision with And with FastScrollEnabled you can now use Section Indexes.<\/p>\n Android isn\u2019t the only beneficiary of ListView love. iOS and UWP get over a dozen updates and fixes to address performance, recycling, and reported memory leaks.<\/p>\n We know many have been following our macOS backend for Xamarin.Forms progress and building from that public branch. Today, we hope everyone will give this preview a run and provide your feedback. Here are the basics of what you need to get started:<\/p>\n Here\u2019s a template To get Xamarin.Forms 2.3.5.233-pre1<\/a>, search your NuGet package manager with the pre-release option enabled, and install it into each PCL and App project.<\/p>\n Be sure to check the full release notes<\/a>, and to see what else is in the Xamarin.Forms pipeline visit the public roadmap<\/a>.<\/p>\n If you have a bug to report, drop us a detailed report here<\/a> so we can investigate.<\/p>\nListView Enhancements<\/h3>\n
listView.On<Android>().SetIsFastScrollEnabled(true);<\/pre>\n
Android<\/code>, this is a clean way to address that:<\/p>\nusing Platform = Xamarin.Forms.PlatformConfiguration;\n...\nlistView.On<Platform::Android>().SetIsFastScrollEnabled(true);\n<\/pre>\n
macOS Preview<\/h3>\n
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AppDelegate.cs<\/code> to give you a jump start:<\/p>\n\n[Register(\"AppDelegate\")]\npublic class AppDelegate : FormsApplicationDelegate\n{\n\tNSWindow _window;\n\tpublic AppDelegate()\n\t{\n\t\tvar style = NSWindowStyle.Closable | NSWindowStyle.Resizable | NSWindowStyle.Titled;\n\n\t\tvar rect = new CoreGraphics.CGRect(200, 1000, 1024, 768);\n\t\t_window = new NSWindow(rect, style, NSBackingStore.Buffered, false);\n\t\t_window.Title = \"Xamarin.Forms Mac\";\n\t\t_window.TitleVisibility = NSWindowTitleVisibility.Hidden;\n\t}\n\n\tpublic override NSWindow MainWindow\n\t{\n\t\tget { return _window; }\n\t}\n\n\tpublic override void DidFinishLaunching(NSNotification notification)\n\t{\n\t\tForms.Init();\n\t\tLoadApplication(new App());\n\n\t\tbase.DidFinishLaunching(notification);\n\t}\n}\n<\/pre>\nTry It Today!<\/h2>\n