更改选项卡时清除查看数据SwiftUI
我在其中一个选项卡中显示每日步骤信息。不幸的是,当我再次选择“步骤”选项卡时,它会在上一个选项卡的下方再添加一个相同的数据 我试图通过切换布尔值来解决这个问题。但这也无济于事更改选项卡时清除查看数据SwiftUI,swift,swiftui,swiftui-tabview,Swift,Swiftui,Swiftui Tabview,我在其中一个选项卡中显示每日步骤信息。不幸的是,当我再次选择“步骤”选项卡时,它会在上一个选项卡的下方再添加一个相同的数据 我试图通过切换布尔值来解决这个问题。但这也无济于事 import SwiftUI import HealthKit struct StepView: View { private var healthStore: HealthStore? @State private var presentClipboardView = true @State
import SwiftUI
import HealthKit
struct StepView: View {
private var healthStore: HealthStore?
@State private var presentClipboardView = true
@State private var steps: [Step] = [Step]()
init() {
healthStore = HealthStore()
}
private func updateUIFromStatistics(_ statisticsCollection: HKStatisticsCollection) {
let now = Date()
let startOfDay = Calendar.current.startOfDay(for: now)
statisticsCollection.enumerateStatistics(from: startOfDay, to: now) { (statistics, stop) in
let count = statistics.sumQuantity()?.doubleValue(for: .count())
let step = Step(count: Int(count ?? 0), date: statistics.startDate, wc: Double(count ?? 0 / 1000 ))
steps.append(step)
}
}
var body: some View {
VStack {
ForEach(steps, id: \.id) { step in
VStack {
HStack{
Text("WC")
Text("\(step.wc)")
}
HStack {
Text("\(step.count)")
Text("Total Steps")
}
Text(step.date, style: .date)
.opacity(0.5)
Spacer()
}
}
.navigationBarBackButtonHidden(true)
}
.onAppear() {
if let healthStore = healthStore {
healthStore.requestAuthorization { (success) in
if success {
healthStore.calculateSteps { (statisticsCollection) in
if let statisticsCollection = statisticsCollection {
updateUIFromStatistics(statisticsCollection)
}
}
}
}
}
}
.onDisappear() {
self.presentClipboardView.toggle()
}
}
}
阶跃模型
struct Step: Identifiable {
let id = UUID()
let count: Int?
let date: Date
let wc: Double
}
HealthStore文件
class HealthStore {
var healthStore: HKHealthStore?
var query: HKStatisticsCollectionQuery?
init() {
if HKHealthStore.isHealthDataAvailable() {
healthStore = HKHealthStore()
}
}
func calculateSteps(completion: @escaping (HKStatisticsCollection?) -> Void ) {
let stepType = HKQuantityType.quantityType(forIdentifier: HKQuantityTypeIdentifier.stepCount)!
let now = Date()
let startOfDay = Calendar.current.startOfDay(for: now)
let daily = DateComponents(day:1)
let predicate = HKQuery.predicateForSamples(withStart: startOfDay, end: Date(), options: .strictStartDate)
query = HKStatisticsCollectionQuery(quantityType: stepType, quantitySamplePredicate: predicate, options: .cumulativeSum, anchorDate: startOfDay, intervalComponents: daily)
query!.initialResultsHandler = { query, statisticCollection, error in
completion(statisticCollection)
}
if let healthStore = healthStore, let query = self.query {
healthStore.execute(query)
}
}
func requestAuthorization(completion: @escaping (Bool) -> Void) {
let stepType = HKQuantityType.quantityType(forIdentifier: HKQuantityTypeIdentifier.stepCount)!
guard let healthStore = self.healthStore else { return completion (false) }
healthStore.requestAuthorization(toShare: [], read: [stepType]) { (success, error) in
completion(success)
}
}
}
根据我的问题,这些都是相关文件。
提前感谢。步骤用
@State
注释,这意味着即使重新绘制视图,也会保留该步骤
你永远不会重置它。您仅附加新步骤。尝试在updateUIFromStatistics
中清除步骤
:
private func updateUIFromStatistics(_ statisticsCollection: HKStatisticsCollection) {
steps = [] // remove previous values
let now = Date()
let startOfDay = Calendar.current.startOfDay(for: now)
statisticsCollection.enumerateStatistics(from: startOfDay, to: now) { (statistics, stop) in
let count = statistics.sumQuantity()?.doubleValue(for: .count())
let step = Step(count: Int(count ?? 0), date: statistics.startDate, wc: Double(count ?? 0 / 1000 ))
steps.append(step)
}
}
你的密码搞错了!我需要完整的代码,可能是因为。什么的完整代码?这是stepviewHealthStore的完整代码?步HealthStore()?steps?Healthstore很好用。我在接收数据方面没有问题。只是复制本身是个问题。如果你可以运行DOS代码,那么我也可以!你可以使用你给定的代码运行此应用程序吗?先试试你自己!我告诉过你3次,你给出了不清楚的信息,并要求回答!怎么可能呢