Utilizing ImageRenderer to Convert SwiftUI Views into Photographs

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ImageRenderer is one other new API for SwiftUI that comes with iOS 16. It lets you simply convert any SwiftUI views into a picture. The implementation may be very easy. You instantiate an occasion of ImageRenderer with a view for the conversion:

You possibly can then entry the cgImage or uiImage property to retrieve the generated picture.

As all the time, I like to display the utilization of an API with an instance. Earlier, we’ve constructed a line chart utilizing the brand new Charts framework. Let’s see learn how to let customers save the chart as a picture within the photograph album and share it utilizing ShareLink.

Revisit the Chart View

swiftui-line-chart

First, let’s revisit the code of the ChartView instance. We used the brand new API of the Charts framework to create a line chart and show the climate knowledge. Right here is the code snippet:

To make use of ImageRenderer, we first refactor this piece of code right into a separate view like this:

Subsequent, we declare a variable to carry the view:

Changing the View into an Picture utilizing ImageRenderer

Now we’re able to convert the chart view into a picture. We are going to add a button named Save to Photographs for saving the chart view picture within the photograph album.

Let’s implement the button like this:

Within the closure of the button, we create an occasion of ImageRenderer with chartView and get the rendered picture by utilizing the uiImage property. Then we name UIImageWriteToSavedPhotosAlbum to avoid wasting the picture to the photograph album.

Be aware: It’s worthwhile to add a key named Privateness – Photograph Library Utilization Description within the data.plist earlier than the app can correctly save a picture to the built-in photograph album.

Including a Share Button

swiftui-share-imagerenderer

Earlier, you discovered learn how to use ShareLink to current a share sheet for content material sharing. With ImageRenderer, you may simply construct a operate for customers to share the chart view.

For comfort function, let’s refactor the code for picture rendering right into a separate methodology:

The generateSnapshot methodology converts the chartView into a picture.

Be aware: In case you are new to @MainActor, you may try this text.

With this helper methodology, we will create a ShareLink like this within the VStack view:

Now once you faucet the Share button, the app captures the road chart and allows you to share it as a picture.

swiftui-weather-chart-imagerenderer

Adjusting the Picture Scale

Chances are you’ll discover the decision of the rendered picture is a bit low. The ImageRenderer class has a property named scale so that you can regulate the dimensions of the rendered picture. By default, its worth is ready to 1.0. To generate a picture with a better decision, you may set it to 2.0 or 3.0. Alternatively, you may set the worth to the dimensions of the display screen:

Abstract

The ImageRenderer class has made it very straightforward to transform any SwiftUI views into a picture. In case your app helps iOS 16 or up, you should utilize this new API to create some handy options in your customers. Apart from rendering photos, ImageRenderer additionally permits you to render a PDF doc. You possibly can discuss with the official documentation for additional particulars.

For charts, Apple additionally comes with a extra particular renderer known as ChartRenderer for exporting a chart as a picture. Later, we’ll additional look into this class.


Founding father of AppCoda. Creator of a number of iOS programming books together with Starting iOS Programming with Swift and Mastering SwiftUI. iOS App Developer and Blogger. Observe me at Fb, Twitter and Google+.



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