ImageRenderer
is one other new API for SwiftUI that comes with iOS 16. It permits you to simply convert any SwiftUI views into a picture. The implementation could be very easy. You instantiate an occasion of ImageRenderer
with a view for the conversion:
let renderer = ImageRenderer(content material: theView) |
You possibly can then entry the cgImage
or uiImage
property to retrieve the generated picture.
As at all times, I like to show the utilization of an API with an instance. Earlier, we’ve constructed a line chart utilizing the brand new Charts framework. Let’s see the right way to let customers save the chart as a picture within the photograph album and share it utilizing ShareLink
.
Revisit the Chart View

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:
}
}
.chartPlotStyle { plotArea in
plotArea
.background(.blue.opacity(0.1))
}
.chartYAxis {
AxisMarks(place: .main)
}
.body(width: 350, top: 300)
.padding(.horizontal)
}
}
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var physique: some View {     VStack {         Chart {             ForEach(chartData, id: .metropolis) { collection in                 ForEach(collection.knowledge) { merchandise in                     LineMark(                         x: .worth(“Month”, merchandise.date),                         y: .worth(“Temp”, merchandise.temperature)                     )                 }                 .foregroundStyle(by: .worth(“Metropolis”, collection.metropolis))                 .image(by: .worth(“Metropolis”, collection.metropolis))             }         }         .chartXAxis {             AxisMarks(values: .stride(by: .month)) { worth in                 AxisGridLine()                 AxisValueLabel(format: .dateTime.month(.defaultDigits))              }         }         .chartPlotStyle { plotArea in             plotArea                 .background(.blue.opacity(0.1))         }         .chartYAxis {             AxisMarks(place: .main)         }         .body(width: 350, top: 300)         .padding(.horizontal)      } } |
To make use of ImageRenderer
, we first refactor this piece of code into a way like this:
}
}
.chartPlotStyle { plotArea in
plotArea
.background(.blue.opacity(0.1))
}
.chartYAxis {
AxisMarks(place: .main)
}
.body(width: 350, top: 300)
.padding(.horizontal)
}
}
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personal func makeChartView() –> some View {     VStack {         Chart {             ForEach(chartData, id: .metropolis) { collection in                 ForEach(collection.knowledge) { merchandise in                     LineMark(                         x: .worth(“Month”, merchandise.date),                         y: .worth(“Temp”, merchandise.temperature)                     )                 }                 .foregroundStyle(by: .worth(“Metropolis”, collection.metropolis))                 .image(by: .worth(“Metropolis”, collection.metropolis))             }         }         .chartXAxis {             AxisMarks(values: .stride(by: .month)) { worth in                 AxisGridLine()                 AxisValueLabel(format: .dateTime.month(.defaultDigits))              }         }         .chartPlotStyle { plotArea in             plotArea                 .background(.blue.opacity(0.1))         }         .chartYAxis {             AxisMarks(place: .main)         }         .body(width: 350, top: 300)          .padding(.horizontal)      } } |
Subsequent, we declare a variable to carry the view:
var chartView = ChartView() |
Changing the View into an Picture utilizing ImageRenderer
Now we’re able to convert the chart view into a picture. We’ll add a button named Save to Images for saving the chart view picture within the photograph album.
Let’s implement the button like this:
VStack(spacing: 20) {
chartView
HStack {
Button {
let renderer = ImageRenderer(content material: chartView)
if let picture = renderer.uiImage {
UIImageWriteToSavedPhotosAlbum(picture, nil, nil, nil)
}
} label: {
Label(“Save to Images”, systemImage: “photograph”)
}
.buttonStyle(.borderedProminent)
}
}
}
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var physique: some View {      VStack(spacing: 20) {         chartView          HStack {             Button {                 let renderer = ImageRenderer(content material: chartView)                  if let picture = renderer.uiImage {                     UIImageWriteToSavedPhotosAlbum(picture, nil, nil, nil)                 }             } label: {                 Label(“Save to Images”, systemImage: “photograph”)             }             .buttonStyle(.borderedProminent)         }     }  } |
Within the closure of the button, we create an occasion of ImageRenderer
with chartView
and get the rendered picture through the use of the uiImage
property. Then we name UIImageWriteToSavedPhotosAlbum
to save lots of the picture to the photograph album.
Notice: It’s essential to add a key named Privateness – Picture 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

Earlier, you realized the right way to use ShareLink
to current a share sheet for content material sharing. With ImageRenderer
, you possibly can simply construct a perform for customers to share the chart view.
For comfort function, let’s refactor the code for picture rendering right into a separate technique:
return renderer.uiImage ?? UIImage()
}
@MainActor personal func generateSnapshot() –> UIImage { Â Â Â Â let renderer = ImageRenderer(content material: chartView) Â Â Â Â Â return renderer.uiImage ?? UIImage() } |
The generateSnapshot
technique converts the chartView
into a picture.
Notice: In case you are new to @MainActor
, you possibly can try this text.
With this helper technique, we will create a ShareLink
like this within the VStack
view:
ShareLink(merchandise: Picture(uiImage: generateSnapshot()), preview: SharePreview(“Climate Chart”, picture: Picture(uiImage: generateSnapshot()))) .buttonStyle(.borderedProminent) |
Now while you faucet the Share button, the app captures the road chart and allows you to share it as a picture.

Adjusting the Picture Scale
You might 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 size of the rendered picture. By default, its worth is about to 1.0. To generate a picture with a better decision, you possibly can set it to 2.0
or 3.0
. Alternatively, you possibly can set the worth to the size of the display screen:
renderer.scale = UIScreen.essential.scale |
Abstract
The ImageRenderer
class has made it very simple to transform any SwiftUI views into a picture. In case your app helps iOS 16 or up, you should use this new API to create some handy options to your customers. Aside from rendering photos, ImageRenderer
additionally permits you to render a PDF doc. You possibly can check with the official documentation for additional particulars.
For charts, Apple additionally comes with a extra particular renderer referred to as ChartRendere
r for exporting a chart as a picture. Later, we are going to additional look into this class.