默认的 CareKit 实现创建一个图表，其中只有两个参数进行比较和对比。是否可以使用图表中的所有参数，使用户能够同时比较和对比不同参数的进度。
我目前正在使用以下代码，但是在尝试添加更多参数时会引发异常错误：
import CareKit
class BuildInsightsOperation: NSOperation {
// MARK: Properties
var medicationEvents: DailyEvents?
var backPainEvents: DailyEvents?
private(set) var insights = [OCKInsightItem.emptyInsightsMessage()]
// MARK: NSOperation
override func main() {
// Do nothing if the operation has been cancelled.
guard !cancelled else { return }
// Create an array of insights.
var newInsights = [OCKInsightItem]()
if let insight = createMedicationAdherenceInsight() {
newInsights.append(insight)
}
if let insight = createBackPainInsight() {
newInsights.append(insight)
}
// Store any new insights thate were created.
if !newInsights.isEmpty {
insights = newInsights
}
}
// MARK: Convenience
func createMedicationAdherenceInsight() -> OCKInsightItem? {
// Make sure there are events to parse.
guard let medicationEvents = medicationEvents else { return nil }
// Determine the start date for the previous week.
let calendar = NSCalendar.currentCalendar()
let now = NSDate()
let components = NSDateComponents()
components.day = -7
let startDate = calendar.weekDatesForDate(calendar.dateByAddingComponents(components, toDate: now, options: [])!).start
var totalEventCount = 0
var completedEventCount = 0
for offset in 0..<7 {
components.day = offset
let dayDate = calendar.dateByAddingComponents(components, toDate: startDate, options: [])!
let dayComponents = NSDateComponents(date: dayDate, calendar: calendar)
let eventsForDay = medicationEvents[dayComponents]
totalEventCount += eventsForDay.count
for event in eventsForDay {
if event.state == .Completed {
completedEventCount += 1
}
}
}
guard totalEventCount > 0 else { return nil }
// Calculate the percentage of completed events.
let medicationAdherence = Float(completedEventCount) / Float(totalEventCount)
// Create an `OCKMessageItem` describing medical adherence.
let percentageFormatter = NSNumberFormatter()
percentageFormatter.numberStyle = .PercentStyle
let formattedAdherence = percentageFormatter.stringFromNumber(medicationAdherence)!
let insight = OCKMessageItem(title: "Adherence", text: "Your routine adherence was \(formattedAdherence) last week.", tintColor: Colors.Pink.color, messageType: .Tip)
return insight
}
func createBackPainInsight() -> OCKInsightItem? {
// Make sure there are events to parse.
guard let medicationEvents = medicationEvents, backPainEvents = backPainEvents else { return nil }
// Determine the date to start pain/medication comparisons from.
let calendar = NSCalendar.currentCalendar()
let components = NSDateComponents()
components.day = -7
let startDate = calendar.dateByAddingComponents(components, toDate: NSDate(), options: [])!
// Create formatters for the data.
let dayOfWeekFormatter = NSDateFormatter()
dayOfWeekFormatter.dateFormat = "E"
let shortDateFormatter = NSDateFormatter()
shortDateFormatter.dateFormat = NSDateFormatter.dateFormatFromTemplate("Md", options: 0, locale: shortDateFormatter.locale)
let percentageFormatter = NSNumberFormatter()
percentageFormatter.numberStyle = .PercentStyle
/*
Loop through 7 days, collecting medication adherance and pain scores
for each.
*/
var medicationValues = [Float]()
var medicationLabels = [String]()
var painValues = [Int]()
var painLabels = [String]()
var axisTitles = [String]()
var axisSubtitles = [String]()
for offset in 0..<7 {
// Determine the day to components.
components.day = offset
let dayDate = calendar.dateByAddingComponents(components, toDate: startDate, options: [])!
let dayComponents = NSDateComponents(date: dayDate, calendar: calendar)
// Store the pain result for the current day.
if let result = backPainEvents[dayComponents].first?.result, score = Int(result.valueString) where score > 0 {
painValues.append(score)
painLabels.append(result.valueString)
}
else {
painValues.append(0)
painLabels.append(NSLocalizedString("N/A", comment: ""))
}
// Store the medication adherance value for the current day.
let medicationEventsForDay = medicationEvents[dayComponents]
if let adherence = percentageEventsCompleted(medicationEventsForDay) where adherence > 0.0 {
// Scale the adherance to the same 0-10 scale as pain values.
let scaledAdeherence = adherence * 10.0
medicationValues.append(scaledAdeherence)
medicationLabels.append(percentageFormatter.stringFromNumber(adherence)!)
}
else {
medicationValues.append(0.0)
medicationLabels.append(NSLocalizedString("N/A", comment: ""))
}
axisTitles.append(dayOfWeekFormatter.stringFromDate(dayDate))
axisSubtitles.append(shortDateFormatter.stringFromDate(dayDate))
}
// Create a `OCKBarSeries` for each set of data.
let painBarSeries = OCKBarSeries(title: "Feel", values: painValues, valueLabels: painLabels, tintColor: Colors.Blue.color)
let medicationBarSeries = OCKBarSeries(title: "Adherence", values: medicationValues, valueLabels: medicationLabels, tintColor: Colors.LightBlue.color)
/*
Add the series to a chart, specifing the scale to use for the chart
rather than having CareKit scale the bars to fit.
*/
let chart = OCKBarChart(title: "Mood",
text: nil,
tintColor: Colors.Blue.color,
axisTitles: axisTitles,
axisSubtitles: axisSubtitles,
dataSeries: [painBarSeries, medicationBarSeries],
minimumScaleRangeValue: 0,
maximumScaleRangeValue: 10)
return chart
}
/**
For a given array of `OCKCarePlanEvent`s, returns the percentage that are
marked as completed.
*/
private func percentageEventsCompleted(events: [OCKCarePlanEvent]) -> Float? {
guard !events.isEmpty else { return nil }
let completedCount = events.filter({ event in
event.state == .Completed
}).count
return Float(completedCount) / Float(events.count)
}
}
/**
An extension to `SequenceType` whose elements are `OCKCarePlanEvent`s. The
extension adds a method to return the first element that matches the day
specified by the supplied `NSDateComponents`.
*/
extension SequenceType where Generator.Element: OCKCarePlanEvent {
func eventForDay(dayComponents: NSDateComponents) -> Generator.Element? {
for event in self where
event.date.year == dayComponents.year &&
event.date.month == dayComponents.month &&
event.date.day == dayComponents.day {
return event
}
return nil
}
}