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First of all, I am quite new to SwiftUI. I have a problem with the annotation of the BarMarks. The annotation is covered by the following BarMarks. Is there a way to prevent this?
import Foundation
import SwiftUI
import Charts
struct WaterConsumptionChart: View {
@ObservedObject var model: ConsumptionDataModel
@State private var selectedItem: ConsumptionData?
@State private var showTooltip: Bool = false
private var gradientColors = [Color.primarySwiftUI.opacity(0.8),
Color.groheLink.opacity(0.8)]
var body: some View {
VStack {
Chart(model.data) { item in
BarMark(
x: .value("", item.text),
y: .value("consumption", item.consumption ?? 0),
width: .automatic
)
.foregroundStyle(LinearGradient(
gradient: Gradient(colors: gradientColors),
startPoint: .top,
endPoint: .bottom
))
.cornerRadius(4)
.annotation(position: .top, alignment: .center) {
let show = ((selectedItem?.text ?? "") == item.text) && ((item.consumption ?? 0) > 0)
TooltipView(value: "\(selectedItem?.text ?? "") • \(selectedItem?.consumption ?? 0)l")
.opacity(show ? 1 : 0)
.offset(y: -2)
}
if let average = model.average, average > 0 {
RuleMark(y: .value("", average))
.foregroundStyle(.primarySwiftUI)
.lineStyle(.init(lineWidth: 1))
} else {
RuleMark(y: .value("", 0.0))
.foregroundStyle(.primarySwiftUI)
.lineStyle(.init(lineWidth: 0))
}
}
.padding([.leading, .trailing], 16)
.chartXAxis {
AxisMarks(values: .automatic(minimumStride: 3, desiredCount: 7)) { value in
let period = viewModel.period?.period
let modulo = period == .day ? 4 : 5
let entry = Int(value.as(String.self) ?? "") ?? 0
if value.count <= 12 || entry % modulo == 0 || value.index == 0 {
let uiFont = Fonts.Inter.regular.of(size: 10)
AxisValueLabel()
.foregroundStyle(.primarySwiftUI)
.font(Font(uiFont))
.offset(x: 0, y: 10)
AxisGridLine()
.foregroundStyle(.greyE1E3E7)
.offset(x: 0, y: 0)
}
}
}
.chartYAxis {
AxisMarks(values: .automatic(desiredCount: 7)) { value in
if let intValue = value.as(Int.self) {
if intValue == 0 {
AxisGridLine()
.foregroundStyle(.primarySwiftUI)
} else {
let uiFont = Fonts.Inter.regular.of(size: 10)
AxisValueLabel("\(intValue)l")
.foregroundStyle(.primarySwiftUI)
.font(Font(uiFont))
AxisGridLine()
.foregroundStyle(.greyE1E3E7)
}
}
}
}
.animation(.smooth, value: viewModel.data)
.chartOverlay { pr in
GeometryReader { geoProxy in
Rectangle()
.fill(.clear).contentShape(Rectangle()).padding([.leading, .trailing], 16)
.onTapGesture(perform: { value in
let origin = geoProxy[pr.plotAreaFrame].origin
let location = CGPoint(x: value.x - origin.x, y: value.y - origin.y)
if let selected = pr.value(atX: location.x, as: String.self),
let dataItem = viewModel.data.first(where: { $0.text == selected }) {
if dataItem.consumption ?? 0 > 0 { UIImpactFeedbackGenerator(style: .light).impactOccurred() }
self.selectedItem = dataItem
} else {
self.selectedItem = nil
}
})
}
}
}
}
}
I tried to experiment with .zIndex(value: Double) but unfortunately I could not solve the problem. I also need compatibility with iOS 16 and .zIndex is only available from iOS 17. Does anyone have an idea?
First of all, I am quite new to SwiftUI. I have a problem with the annotation of the BarMarks. The annotation is covered by the following BarMarks. Is there a way to prevent this?
import Foundation
import SwiftUI
import Charts
struct WaterConsumptionChart: View {
@ObservedObject var model: ConsumptionDataModel
@State private var selectedItem: ConsumptionData?
@State private var showTooltip: Bool = false
private var gradientColors = [Color.primarySwiftUI.opacity(0.8),
Color.groheLink.opacity(0.8)]
var body: some View {
VStack {
Chart(model.data) { item in
BarMark(
x: .value("", item.text),
y: .value("consumption", item.consumption ?? 0),
width: .automatic
)
.foregroundStyle(LinearGradient(
gradient: Gradient(colors: gradientColors),
startPoint: .top,
endPoint: .bottom
))
.cornerRadius(4)
.annotation(position: .top, alignment: .center) {
let show = ((selectedItem?.text ?? "") == item.text) && ((item.consumption ?? 0) > 0)
TooltipView(value: "\(selectedItem?.text ?? "") • \(selectedItem?.consumption ?? 0)l")
.opacity(show ? 1 : 0)
.offset(y: -2)
}
if let average = model.average, average > 0 {
RuleMark(y: .value("", average))
.foregroundStyle(.primarySwiftUI)
.lineStyle(.init(lineWidth: 1))
} else {
RuleMark(y: .value("", 0.0))
.foregroundStyle(.primarySwiftUI)
.lineStyle(.init(lineWidth: 0))
}
}
.padding([.leading, .trailing], 16)
.chartXAxis {
AxisMarks(values: .automatic(minimumStride: 3, desiredCount: 7)) { value in
let period = viewModel.period?.period
let modulo = period == .day ? 4 : 5
let entry = Int(value.as(String.self) ?? "") ?? 0
if value.count <= 12 || entry % modulo == 0 || value.index == 0 {
let uiFont = Fonts.Inter.regular.of(size: 10)
AxisValueLabel()
.foregroundStyle(.primarySwiftUI)
.font(Font(uiFont))
.offset(x: 0, y: 10)
AxisGridLine()
.foregroundStyle(.greyE1E3E7)
.offset(x: 0, y: 0)
}
}
}
.chartYAxis {
AxisMarks(values: .automatic(desiredCount: 7)) { value in
if let intValue = value.as(Int.self) {
if intValue == 0 {
AxisGridLine()
.foregroundStyle(.primarySwiftUI)
} else {
let uiFont = Fonts.Inter.regular.of(size: 10)
AxisValueLabel("\(intValue)l")
.foregroundStyle(.primarySwiftUI)
.font(Font(uiFont))
AxisGridLine()
.foregroundStyle(.greyE1E3E7)
}
}
}
}
.animation(.smooth, value: viewModel.data)
.chartOverlay { pr in
GeometryReader { geoProxy in
Rectangle()
.fill(.clear).contentShape(Rectangle()).padding([.leading, .trailing], 16)
.onTapGesture(perform: { value in
let origin = geoProxy[pr.plotAreaFrame].origin
let location = CGPoint(x: value.x - origin.x, y: value.y - origin.y)
if let selected = pr.value(atX: location.x, as: String.self),
let dataItem = viewModel.data.first(where: { $0.text == selected }) {
if dataItem.consumption ?? 0 > 0 { UIImpactFeedbackGenerator(style: .light).impactOccurred() }
self.selectedItem = dataItem
} else {
self.selectedItem = nil
}
})
}
}
}
}
}
I tried to experiment with .zIndex(value: Double) but unfortunately I could not solve the problem. I also need compatibility with iOS 16 and .zIndex is only available from iOS 17. Does anyone have an idea?
Share Improve this question edited Feb 13 at 16:24 malhal 30.8k7 gold badges122 silver badges150 bronze badges asked Feb 13 at 13:00 MallenowMallenow 133 bronze badges2 Answers
Reset to default 0The best way to ensure annotations are above all bars is to draw them separately. Instead of adding .annotation() inside the BarMark, create a second Chart layer on top (cleaner even if zIndex would be available).
Chart {
// First layer: Bars (rendered first, in background)
ForEach(model.data, id: \.text) { item in
BarMark(
x: .value("", item.text),
y: .value("consumption", item.consumption ?? 0),
width: .automatic
)
.foregroundStyle(LinearGradient(
gradient: Gradient(colors: gradientColors),
startPoint: .top,
endPoint: .bottom
))
.cornerRadius(4)
}
// Second layer: Annotations (rendered last, on top)
ForEach(model.data, id: \.text) { item in
if let selectedItem = selectedItem, selectedItem.text == item.text, let consumption = selectedItem.consumption, consumption > 0 {
PointMark(
x: .value("", item.text),
y: .value("consumption", item.consumption ?? 0)
)
.annotation(position: .top, alignment: .center) {
TooltipView(value: "\(selectedItem.text) • \(consumption)l")
.opacity(1)
.offset(y: -2)
}
}
}
// Third layer: RuleMark (always on top of bars)
if let average = model.average, average > 0 {
RuleMark(y: .value("", average))
.foregroundStyle(.primarySwiftUI)
.lineStyle(.init(lineWidth: 1))
}
}
chartAnnotation is not suitable for this. I'd suggest putting the tooltip in the chartOverlay instead. You can use the ChartProxy you get to find the coordinates of the top of the bar, and position your view there.
Here is a complete example, where I just use position to position the view. For a tooltip, you should probably move it up a bit with offset.
struct Bar: Identifiable {
let x: String
let y: Double
var id: String { x }
}
struct ContentView: View {
let values = [
Bar(x: "A", y: 10),
Bar(x: "B", y: 1),
Bar(x: "C", y: 10),
Bar(x: "D", y: 1),
Bar(x: "E", y: 10),
Bar(x: "F", y: 1),
Bar(x: "G", y: 10),
Bar(x: "H", y: 1),
Bar(x: "I", y: 10),
Bar(x: "J", y: 1),
Bar(x: "K", y: 10),
Bar(x: "L", y: 1),
Bar(x: "M", y: 10),
]
@State private var selectedItem: Bar?
var body: some View {
Chart {
ForEach(values) { value in
BarMark(
x: .value("X", value.x),
y: .value("Y", value.y)
)
}
}
.chartOverlay { pr in
GeometryReader { geoProxy in
ZStack {
Rectangle()
.fill(.clear).contentShape(Rectangle()).padding([.leading, .trailing], 16)
.onTapGesture(perform: { value in
let origin = geoProxy[pr.plotAreaFrame].origin
let location = CGPoint(x: value.x - origin.x, y: value.y - origin.y)
if let selected = pr.value(atX: location.x, as: String.self),
let dataItem = values.first(where: { $0.x == selected }) {
self.selectedItem = dataItem
} else {
self.selectedItem = nil
}
})
if let selectedItem,
let x = pr.position(forX: selectedItem.x),
let y = pr.position(forY: selectedItem.y) {
Text("Some Looooooong Tooltip Text")
.background(.red)
.position(x: x, y: y)
}
}
}
}
}
}
A more sophisticated way to position the tooltip would be to align its bottom center at the top left of the chart, and then offset it using the x and y coordinates from the ChartProxy.
Text("Some Looooooong Text")
.background(.red)
.alignmentGuide(HorizontalAlignment.leading) { $0[HorizontalAlignment.center] }
.alignmentGuide(VerticalAlignment.top) { $0[.bottom] }
.offset(x: x, y: y - 10) // 10pts above the bar
.frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .topLeading)
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