![]() ![]() In conclusion I think this is a really welcome addition to Xcode/iOS – apps will have a more consistent look across iOS, and I think SF symbols should make life much easier for us – less time for example, taken up sourcing icons and finding (or designing) a variety of sizes and weights. Again, I recommend you check out the WWDC session on SF symbols here. Well, that’s the basics – there’s a lot more to look at – such as alignment, automatic configuration based on size class, making your app with SF symbols compatible with devices with < iOS 13, and building your own SF symbols. Use the SF Symbols app to look up the names of system symbol images. iOS 13.0+ iPadOS 13.0+ macOS 11.0+ Mac Catalyst 13.0+ tvOS 13.0+ watchOS 6.0+ init(systemName: String) Parameters systemName The name of the system symbol image. As they are integrated into the San Francisco system font, they automatically ensure optical vertical alignment with text for all weights and sizes. Initializer init (systemName:) Creates a system symbol image. Initializer init (systemName:) Creates a system symbol image. They’re aligned and configurable in a wide range of weights and scales to adapt to your designs. Of course, as we saw at the start of this post, you can also include SF symbols in SwiftUI views. What are SF Symbols SF Symbols is a set of over 3,100 symbols that you can use in your app. SDKs iOS 13.0+Beta tvOS 13.0+Beta watchOS 6. We also saw at the start of this post that you can also include SF symbols in SwiftUI views.You might be interested to know you can also add them in the storyboard: init (systemName:) Creates an image object containing a system symbol image. This is possible with SF symbols too - instead of specifying the point size, you can create the config property using a text style, just as you might with a label or text field:īy the way, so far we’ve been looking at how to add SF symbols in code. Having point size available is great, but we generally try to avoid specifying a point size with text - instead we prefer to use text styles, such as Body, Headline, etc where possible to take advantage of dynamic type. Perhaps you might be lining up an image with a label, adding an image to a button, or even inserting an SF symbol in a string! It should be mentioned that inserting an SF symbol into a string isn’t working yet for the current beta of Xcode 11, but it sounds very promising, adjusting the style of the symbol to the text surrounding it! Image(systemName: '') // Create a custom symbol image using an asset in an asset catalog in Xcode. Well, the scale property allows you to adjust the scale of a symbol in relation to the text around it without having to adjust the pointSize. In SwiftUI, you use Image (systemName:) to load a system symbol image and Image (:) to load your custom symbol, as the following code shows: // Create a system symbol image. Why have both pointSize and scale, you might ask. It should be noted that pointSize refers to a typographical point size – the same point size a font uses – rather than points on the screen. You can adjust the weight and scale of the image, along with its pointSize, using a config property: You’ll find an example of these in the Human Interface Guidelines: SwiftUI’s Image view lets us load any of the 2400+ icons from SF Symbols, with many of them working in multi-color too. ![]() In the SF Symbols program you’ll notice you can play with the weight and scale of the image. frame (width: 250.0, height: 250.0) Note that I’m using the SwiftUI canvas live preview of my code and it highlighted the border of my custom frame because I kept the blinking cursor. Position the image within a custom frame: Image ( 'fall-leaves' ). You’ll also find guidance there for building your own SF Symbol, using the SF Symbols program. SwiftUI Image with text header aligned to top of the screen. You’ll also find Apple’s guidelines for using SF Symbols in the Human Interface Guidelines here. Make sure not to optimize prematurely and do your measurements before tweaking the performance.There is a WWDC session on SF symbols well worth checking out here. In this case, I suggest looking into download task and downloadTaskPublisher. Performance Noteĭownloading large images with a data task may result in memory pressure, as measured by Tibor. It is published under the “Unlicense”, which allows you to do whatever you want with it. ![]()
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