I am unable to find any related documentation on how to do a linear gradient on the foreground for an image I have with SwiftUI.
I have tried to do it like so:
Image("IconLoseWeight")
.frame(width: 30.0, height: 30.0)
.padding(.leading, 17)
.foregroundColor(LinearGradient(gradient: Gradient(colors: [.white, .black]), startPoint: .top, endPoint: .bottom))
Actually, the code shown above doesn't display any errors, but it breaks the code with warnings that make no sense in the top level Stacks (which I think is a bug with Xcode or SwiftUI). If I remove the foreground
modifier, the code runs perfectly.
The Gradient Fill Image is added to the Shader Tree using the Add Layer option found under Add Layer > Image Map > image > Gradient Fill. Once created, the layer itself can be positioned, and its Effect defined in the Shader Tree.
One way to do it is using Color(red: ..., green: ..., blue: ...) . You can provide the RGB (Red, Green, blue) value on a 0-1 range. You can also initialize color with UIColor (from UIKit) and NSColor (from AppKit). Let's try to initialize hot pink with UIColor this time.
That's because foregroundColor wants a Color
, but LinearGradient
is a struct
that conforms to the protocols ShapeStyle
and View
.
If I understand you correctly you want to fill the intransparent area of an image with a gradient?
ZStack {
Color.white // For the background. If you don't need a background, you don't need the ZStack.
LinearGradient(gradient: Gradient(colors: [.green, .blue]), startPoint: .top, endPoint: .bottom)
.mask(Image("AssetWithTransparency")
.resizable()
.padding()
.aspectRatio(contentMode: .fit))
}.cornerRadius(15)
The result looks like this:
The task here is to display gradient over an image. To display one view over another SwiftUI provides ZStack
view, so, the code can have the next structure:
ZStack {
<Image>
<Rectangle with gradient>
}
Additionally, to make sure the image we use is resized correctly to the specified frame resizable
modifier should be applied with correct contentMode
:
Image("IconLoseWeight")
.resizable() // Make it resizable
.aspectRatio(contentMode: .fit) // Specifying the resizing mode so that image scaled correctly
After all, we need to apply frame
and padding parameter to ZStack
so that gradient has the same size as the image.
The result would look like that:
ZStack {
Image("IconLoseWeight")
.resizable() // Making the image resizable to the container size
.aspectRatio(contentMode: .fit) // Setting up resizing mode so that the image scaled correctly
Rectangle() // Shapes are resizable by default
.foregroundColor(.clear) // Making rectangle transparent
.background(LinearGradient(gradient: Gradient(colors: [.clear, .black]), startPoint: .top, endPoint: .bottom), cornerRadius: 0)
// Specifying gradient (note that one color is .clear)
}
.frame(width: 30, height: 30) // Applying frame
.padding(.leading, 17) // Applying padding
Note, that we use a gradient from .clear
to .black
as we need a transparent gradient to make the image visible.
Agree with @RyuX51's answer and it's working well. But some how size and alignment of my image got changed. Because LinearGradient
's frame
isn't set.
So here i came up with the solution for just applying gradient to the Image
,
VStack{
Spacer()
Button(action: {
print("Add Photos")
}, label: {
LinearGradient(gradient: Gradient(colors: [.green, .blue]), startPoint: .top, endPoint: .bottom)
.mask(Image(systemName: "plus.circle.fill")
.resizable()
.aspectRatio(contentMode: .fit)
).frame(width: 70, height: 70, alignment: .center)
})
}
The best way to do this as of the most recent SwiftUI release would be to use the .foregroundStyle()
view modifier. I'm not sure when this approach became available but this code was tested with Xcode 14 and iOS 16.
Sample code below:
let gradient = Gradient(colors: [.purple, .cyan, .orange])
var body: some View {
Image(systemName: "figure.strengthtraining.traditional")
.font(.title)
.foregroundStyle(.linearGradient(gradient, startPoint: .top, endPoint: .bottom))
}
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