Step Tracker (Sean Allen Portfolio Course) Teachable.com

Step Tracker integrates Apple Health to display the users most up-to-date step and weight data in an interactive Swift Charts with animations. The user can also track their average step count and weight gain/loss for the pass 28 days.

Users can also upload new step and weight data directly to HealthKit through the Step Tracker App.

Technologies Used

• SwiftUI
• HealthKit
• Swift Charts
• Swift Algorithms
• DocC
• Git & GitHub
• Swift Testing
• Swift 6 Concurrency

Animated Charts

StepTracker.mov

Challenges

Calculating the average weight difference per day of the week for the weight Bar Chart. I solved this challenge by pulling the last 29 days of weight data and calculated the difference between each weekday. I then took the average of each weekdays gain/loss and used the weekday averages as plot points on the weight bar chart. I used different color bars to represent gain and losses to assist users with visualizing their progress on the chart.

  static func averageDailyWeightDiffs(for weights: [HealthMetric]) -> [DateValueChartData] {
    var diffValues: [(date: Date, value: Double)] = []

    guard weights.count > 1 else { return [] }

    for i in 1..<weights.count {
      let date = weights[i].date
      let diff = weights[i].value - weights[i - 1].value
      diffValues.append((date: date, value: diff))

    }

    let sortedByWeekday = diffValues.sorted(using: KeyPathComparator(\.date.weekdayInt))
    let weekdayArray = sortedByWeekday.chunked { $0.date.weekdayInt == $1.date.weekdayInt }

    var weekdayChartData: [DateValueChartData] = []

    for array in weekdayArray {
      guard let firstValue = array.first else { continue }
      let total = array.reduce(0) { $0 + $1.value }
      let avgWeightDiff = total/Double(array.count)

      weekdayChartData.append(.init(date: firstValue.date, value: avgWeightDiff))
    }

    return weekdayChartData
  }

Charts

Additional Project Implementations

• Error Handling & Alerts
• Empty States
• Permission Priming
• Text Input validation
• Unit Tests
• Accessibility
• Privacy Manifest
• Code Documentation (DocC)