TEAM LICENSES: Save money and learn new skills through a Hacking with Swift+ team license >>

SOLVED: Odd annotation being displayed on a chart

Forums > SwiftUI
@flaneur7508  

Hi folks. Hellp wanted :) (well, needed)

I have a chart as follows

        Chart {
            ForEach(last5Crawls) { crawlData in
                BarMark(
                    x: .value("description", Data.index),
                    y: .value("date", Data.DateLaunched),
                    width: 23
                )
                .foregroundStyle(Color.appTeal.gradient)
                .cornerRadius(10)
                .annotation(position: .trailing) {
                    Text("\(Data.index)")
                        .foregroundColor(.appTeal)
                        .font(.system(size: 10, weight: .semibold))
                        .foregroundColor(.appGray)
                }
            }
        }

Normally there are 5 elements in the X and Y values. When I have, for example, 1 element with data, I get an annotation displayed which just contains the number 0.

Heres an example: https://imgur.com/a/WsTI7BZ

How can I get rid of that "0" that's displayed.

Any advice greatly appriciated!

1      

@NigelGee  HWS+

Filter the data to only show data greater then 0 then insert that in the the Chart

2      

@flaneur7508  

@NigelGee. Yes thank you. This is the solution.

            ForEach(last5Tests.filter { $0.hasPurchases > 0 }) { testData in
                BarMark(
                    x: .value("Purchased", testData.hasPurchases),
                    y: .value("Test", testData.testDateLaunched),
                    width: 25
                )

The line

            ForEach(last5Tests.filter { $0.hasPurchases > 0 }) { testData in

Only sends non zero data to the chart.

1      

@tblocyn  

Hello there!

It looks like you're dealing with an issue where an unwanted "0" is displayed in the annotation when you have only one element of data. To resolve this, you can conditionally display the annotation only when there is more than one element. Here's a modified version of your code to achieve this:

swift Copy code Chart { ForEach(last5Crawls) { crawlData in BarMark( x: .value("description", Data.index), y: .value("date", Data.DateLaunched), width: 23 ) .foregroundStyle(Color.appTeal.gradient) .cornerRadius(10) .overlay( Group { if last5Crawls.count > 1 { BarAnnotation(dataIndex: Data.index) } } ) } } In this modified code, I added an overlay with a Group that conditionally includes the BarAnnotation only when there is more than one element in last5Crawls. This should prevent the unwanted "0" from being displayed when you have a single element.

Make sure to replace BarAnnotation(dataIndex: Data.index) with the appropriate annotation code you have in your project.

I hope this helps! If you have any further questions or issues, feel free to ask.

1      

Hacking with Swift is sponsored by RevenueCat.

SPONSORED Take the pain out of configuring and testing your paywalls. RevenueCat's Paywalls allow you to remotely configure your entire paywall view without any code changes or app updates.

Learn more here

Sponsor Hacking with Swift and reach the world's largest Swift community!

Reply to this topic…

You need to create an account or log in to reply.

All interactions here are governed by our code of conduct.

Swift breaks down barriers between ideas and apps, and I want to break down barriers to learning it. I’m proud to make hundreds of tutorials that are free to access, and I’ll keep doing that whatever happens. But if that’s a mission that resonates with you, please support it by becoming a HWS+ member. It’ll bring you lots of benefits personally, but it also means you’ll directly help people all over the world to learn Swift by freeing me up to share more of my knowledge, passion, and experience for free! Become Hacking with Swift+ member.
Click here to visit the Hacking with Swift store >>
 
Unknown user

You are not logged in

Log in or create account
 

Link copied to your pasteboard.