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For more information, see Image Sizes and Filenames.Īndroid alternate resolution images should be placed in specially-named directories in the Android project, as shown in the following screenshot: However, this method of working with images in an iOS app has been deprecated by Apple. Prior to iOS 9, retina versions of the image could be placed in the Resources folder - two and three times the resolution with a or suffixes on the filename before the file extension (eg. For more information, see Adding Images to an Asset Catalog Image Set. The preferred way to manage images since iOS 9 is to drag images for each resolution required to the appropriate asset catalog image set. Xamarin.Forms uses the native platforms' APIs for loading local images, so it automatically supports alternate resolutions if the files are correctly named and located in the project. IOS, Android, and UWP include support for different image resolutions, where the operating system chooses the appropriate image at runtime based on the device's capabilities. The example filename waterfront.pngįollows the rules, but examples of invalid filenames include "water front.png", "WaterFront.png", "water-front.png", and "wåterfront.png". Android drawables have naming restrictions – only lowercase letters, numbers, underscore, and period are allowed – and for cross-platform compatibility this must be followed on all the other platforms too. To use the same image filename across all platforms the name must be valid on all platforms.
For more information, see Default image directory on Windows. Alternatively, images can be placed in a different directory which is then specified with a platform-specific.
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iOS - The preferred way to manage and support images since iOS 9 is to use Asset Catalog Image Sets, which should contain all of the versions of an image that are necessary to support various devices and scale factors for an application.only lowercase letters, numerals, the underscore, and the period are allowed). To use a single image across all apps, the same filename must be used on every platform, and it should be a valid Android resource name (i.e. This method of distributing images is required when images are platform-specific, such as when using different resolutions on different platforms, or slightly different designs. Image files can be added to each application project and referenced from Xamarin.Forms shared code. For more information, see Display font icons in the Fonts guide. In addition, font icons can be displayed by the Image view by specifying the font icon data in a FontImageSource object. Images can be loaded from a local file, an embedded resource, downloaded, or loaded from a stream. AspectFit - Letterboxes the image (if required) so that the entire image fits into the display area, with blank space added to the top/bottom or sides depending on whether the image is wide or tall.AspectFill - Clips the image so that it fills the display area while preserving the aspect (i.e.This may result in the image being distorted. Fill - Stretches the image to completely and exactly fill the display area.The Aspect property determines how the image will be scaled to fit the display area: FromStream - Requires a stream that supplies image data.NET Standard library project, with a Build Action:EmbeddedResource. FromResource - Requires a resource identifier to an image file embedded in the application or.FromFile - Requires a filename or filepath that can be resolved on each platform.ImageSource instances can be obtained using static methods for each type of image source:
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Aspect - How to size the image within the bounds it is being displayed within (whether to stretch, crop or letterbox).Source - An ImageSource instance, either File, Uri or Resource, which sets the image to display.Xamarin.Forms uses the Image view to display images on a page. Platform-specific images are also required for icons and splash screens these need to be configured on a per-platform basis.
Xamarin.Forms applications need to be able to share images across all platforms, but also potentially display different images on each platform. Images are a crucial part of application navigation, usability, and branding. Images can be shared across platforms with Xamarin.Forms, they can be loaded specifically for each platform, or they can be downloaded for display.