SwiftUI animation system is simply amazing. But when using gradient fills, it is impossible to animate color change by just changing its color properties. In this article, I will present and discuss possible ways how to animate gradient fills and also address the issue with. The urge of animating gradient fill was actually the first topic I was forced to solve when I jumped into SwiftUI.
In my app, I wanted to have a gradient background that changes its color from time to time. Here are options how to animate gradient that I am aware of, the first two are very limited the latter two more robust, so choose depending on your use case. With changing gradient starting and ending points you are able to change gradient orientation and scale.
Since the starting and ending point does not have to be limited to view bounds only This can be utilized for color change animation within a pre-defined color set. Better than words is to demonstrate that with example. It offers animations in a whole variety of color hues but does not let you change color randomly.
More color changes can be achieved by combination with other modifiers like. Next example features usage of hueRotation modifier together with decreasing saturation. While playing with hueRotation modifiers, I have noticed that it works differently than one would expect. This modifier does not preserve brightness and saturation as it is common in graphical tools like PS.
Here you can see a comparison of results of hueRotation modifier and the expectation via constructing the color directly in HSB space. I am not sure whether this behavior is intended or not, but it is important to be aware of it the result of hueRotation may disappoint you. It is possible to create an animated gradient via AnimatableModifier. This approach was presented by Javier Kudos!!
This approach requires the implementation of color interpolation and its usage of AnimatableModifier reminds me of GeometryEffect which I have dedicated my previous post to. We have full control of how interpolated value is translated to the view appearance so we can reach really crazy effects like pulsating color transition. Please note that AnimatableModifier actually produces a view, so even that it has been applied to a circle view, our result is still a rounded rectangle.
The main drawback of this approach IMO is that you need to provide interpolating value to the effect and it is quite challenging to wrap everything to a simple interface with the single color setter. The solution that I like the most is the simple blending of two gradient layers. Feel free to comment or criticize so the next one is even better.
Or share it with other SwiftUI adopters .SwiftUI gives us a variety of gradient options, all of which can be used in a variety of ways. For example, you could render a text view using a white to black linear gradient like this:. The colors are specified as an array and you can have as many as you want — by default SwiftUI will space them equally.
So, we could go from white to red to black like this:. To make a horizontal gradient rather than a vertical one, use. For alternative gradient styles, try RadialGradient or AngularGradient.
As an example, this creates a radial gradient through a variety of colors, starting from the center of the circle and going out to the edges:. And this creates an angular gradient often called a conic gradientcycling through various colors then returning to the beginning:.
Because all three gradient types conform to the ShapeStyle protocol, you can use them for backgrounds, fills, and strokes. For example, this uses our rainbow conical gradient as a thick inner stroke for a circle:.
Sponsor Hacking with Swift and reach the world's largest Swift community! Articles Learn Start Here. Start Here. Browse Swift Courses Book bundles. About Hacking with Swift. Was this page useful? Let us know! Link copied to your pasteboard.You will understand what I mean in a while. First, fire up Xcode and create a new project using the Single View Application template.
Type the name of the project. All you need to ensure is check the Use SwiftUI option. Once you save the project, Xcode should load the ContentView. In case the preview is not displayed, you can click the Resume button in the canvas.
Basically, you can use the code snippet below to create a button:. For example, if you just want to turn the Hello World label into a button, you can update the code like this:. The button is now non-tappable in the design canvas. To test it, click the Play button to run the app.Swift - Gradient Background on UIView or UIButton
However, in order to view the Hello World tapped message, you have to right-click the Play button and then choose Debug Preview. You will see the message on the console when you tap the button. Say, to change the background and text color, you can use the background and foregroundColor modifiers like this:.
If you want to change the font type, you further use the font modifier and specify the font type e. To do that, you can use the padding modifier like this:. After you made the change, the canvas should update the button accordingly.
The button should now look much better. One thing I want to highlight is that the padding modifier should be placed before the background modifier. If you write the code like below, the end result will be different. If you place the padding modifier after the background modifier, you can still add some paddings to the button but without the preferred background color.Finally, I had some spare time to get my hands dirty with SwiftUI and that was a pleasant few hours.
I started doing a new project - macOS application which soon I might open-source but for now, I have prepared an article about masks and overlays. What does it do? It layers a secondary view in front of the view. Sounds just like well known ZStack although it's a little bit different, so let's dive into details. This function takes an overlay view which is just another object that conforms to View protocol, as well as an alignment that defaults to center.
Since in SwiftUI pretty much every user interface element is a View we can use this pretty much on anything we would like to. What's the advantage of using it over ZStack you might be wondering? When you apply an overlay to a view, the parent view continues to provide the layout characteristics for its child view. That means our overlay view won't change a frame parent view in any way. Thanks to that we can easily place a view on top of another view and keep it within its frame while with ZStack we would have to do some extra work to achieve the same result.
Let's say we want to place an image on top of another image while keeping the top image inside the parent image's frame.
With overlay, it's just a matter of a few lines of code. We could make it with ZStack as well but that would require from us a little bit more of work and with SwiftUI there is always a several way to achieve the same thing - you can pick what you like the most, ie.
Anyway, let's move to another topic - masks which I think are more interesting. And that's just a 5 minutes example It's time for some examples that actually might be used in our real application I do it in the app I am working now at.
How to Create a Neumorphic Design With SwiftUI
Let's say we want to make a text with some nice effect - not just a solid color as that would be quite easy. I will show you how to use those two methods we just learned to get a gradient text like the one below. If you give it a try you will notice a small issue though.SwiftUI has a built-in way to apply gradient color to its view.
There are three types of gradients:. Before we visit each gradient, let's begin with a component that they have in common, Gradient. Gradient is a struct holding information for rendering all types of a gradient represented as an array of color stops. Stop is a struct represented each color and location in range of 0 to 1 in a gradient.
The gradient applies the color function along an axis, as defined by its start and end points. The gradient maps the unit-space points into the bounding rectangle of each shape filled with the gradient. In short, you specify the start and end points of the gradient with UnitPointa struct represented x, y coordinate space range from 0 to 1and gradient stop will be rendered along that path based on each stop's location.
SwiftUI has predefined UnitPoint. You can create your own UnitPoint like a normal struct if you have a special need. The gradient applies the color function as the distance from a center point, scaled to fit within the defined start and end radii.
The gradient maps the unit-space center point into the bounding rectangle of each shape filled with the gradient. RadialGradient might looks different from LinearGradient, but the concept is quite the same.
The only difference is instead of define starting and ending points, you define start radius, end radius, and the center of the gradient.
The gradient will be drawn as circular around the center and move outward to the end radius. This gradient applies the color function as the angle changes, relative to a center point and defined start and end angles. AngularGradient applies the color as the angle changes; you define the start and end angle which gradient will be applied to.
The following is the simplest form. You define a center of the circle, and the gradient will start from 0 degrees the rightmostand the remaining colors will be drawn clockwise until it completes the circle. If you don't want to start from 0 degrees, you can use the second form where you can specify angle start angle.
If you want to specify the end angle, you have to use the last form where you define startAngle and endAngle. This is a normal case where the start and end angle make a complete circle.
Every color will evenly distribute.You feel the longing, that absence to make hearts grow fonder. You miss your dear skeuomorphism. When you look at your screens today, they look so flat and boring. If only there was a skeuomorphic design language that looked new and fresh. In latea tweet made the rounds that included designs from Alexandar Plyuto.
And they are fabulous:. You will discover how to:. Smart homes are all the rage these days. Not to be outdone, super villains and mad scientists are now super into smart lairs. Maybe more so. To get started, click the Download Materials button at the top or bottom of this tutorial.
Open the begin project and explore its contents. Remember: This is a big opportunity for you.
If the villains like your work, it could lead to more contracts in the future. Before you begin, you need to familiarize yourself with LinearGradient.
Skeuomorphic design leans heavily on linear gradients. Here, you define that the gradient will go from white to lairLightGraya Color you will add to the project later. You can have more than two colors if you want the gradient to pass through several:.
For instance, a negative coordinate value would start the gradient outside of the view. In the code above, there are also some predefined constants for typical start and end points, such as. Start by attacking the boring looking AccessoryView.
It represents the large rectangles in the middle of the screen with labels such as Control Room Lights and Dungeon.
Drag the Extensions folder from the downloaded materials to your Xcode project. Place it above the Views group. Make sure Copy items if needed and Create groups are selected, then click Finish.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. You need to mask a gradient with your text:. I would say it isn't possible in pure SwiftUI.
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Learn more. Asked 4 months ago. Active 1 month ago. Viewed times. Thanks for the answers in advance! VViktor VViktor 1 1 silver badge 9 9 bronze badges. Active Oldest Votes.
Animating gradients in SwiftUI
Rohit Makwana Rohit Makwana 1, 5 5 silver badges 14 14 bronze badges. You need to mask a gradient with your text: LinearGradient gradient: Gradient colors: [. Unfortunately, perhaps, the LinearGradient view is greedy and uses all available space. That's why your sample shows it flush with the top of the screen and not in the center as a simple Text alone would be.
Also, the greedy gradient runs the full height of the space it takes, but the mask is only using a bit at the top. That is why you don't see a full blue at the bottom.
I guess that should help. Works with text, images and any other views. Maxim Krouk Maxim Krouk 41 3 3 bronze badges. It won't fit on the screen.
You can use this to have gradient as foreground color of your Text: Text "Hello World". Aira Samson Aira Samson 5 5 bronze badges. Sadly, I've tried it before and it just gives you an error, but thanks for the effort! Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.
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