从HealthKit查询更新SwiftUI
从HealthKit查询更新SwiftUI
提问于 2021-05-09 21:22:13
我想在SwiftUI中通过ContentView输出变量'healthStore.valueTest‘。
healtStore类的结构如下：
class HealthStore {
var healthStore: HKHealthStore?
var query: HKStatisticsQuery?
var valueTest: HKQuantity?
init() {
if HKHealthStore.isHealthDataAvailable() {
healthStore = HKHealthStore()
}
}
func calculateBloodPressureSystolic() {
guard let bloodPressureSystolic = HKObjectType.quantityType(forIdentifier: .bloodPressureSystolic) else {
// This should never fail when using a defined constant.
fatalError("*** Unable to get the bloodPressure count ***")
}
// let startDate = Calendar.current.date(byAdding: .day, value: -7, to: Date())
// let anchorDate = Date.mondayAt12AM()
// let daily = DateComponents(day: 1)
// let predicate = HKQuery.predicateForSamples(withStart: startDate, end: Date(), options: .strictStartDate)
query = HKStatisticsQuery(quantityType: bloodPressureSystolic,
quantitySamplePredicate: nil,
options: .discreteAverage) {
query, statistics, error in
DispatchQueue.main.async{
self.valueTest = statistics?.averageQuantity()
}
}
healthStore!.execute(query!)
}
}ContentView的构建方式如下：
import SwiftUI
import HealthKit
struct ContentView: View {
private var healthStore: HealthStore?
init() {
healthStore = HealthStore()
}
var body: some View {
Text("Hello, world!")
.padding().onAppear(){
if let healthStore = healthStore {
healthStore.requestAuthorization { success in
if success {
healthStore.calculateBloodPressureSystolic()
print(healthStore.query)
print(healthStore.valueTest)
}
}
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}变量self.valueTest的值在process DispatchQueue.main.async中赋值。然而，当我通过ContentView查询时，我只得到了一个nil的返回值。
Stack Overflow用户
发布于 2021-05-09 22:25:57
您可以设置HealthStore类并将其用作EnvironmentObject。假设您的应用程序使用SwiftUI生命周期，您可以在应用程序的@main入口点将HealthStore注入到环境中。
import SwiftUI
@main
struct NameOfYourHeathApp: App {
let healthStore = HealthStore()
var body: some Scene {
WindowGroup {
ContentView()
.environmentObject(healthStore)
}
}
}将您的HealthStore类更改为以下内容。(我在下面的示例中删除了您注释掉的代码)
import HealthKit
class HealthStore: ObservableObject {
var healthStore: HKHealthStore?
var query: HKStatisticsQuery?
var valueTest: HKQuantity?
init() {
if HKHealthStore.isHealthDataAvailable() {
healthStore = HKHealthStore()
}
}
// I moved the HealthStore conditional check out of your View logic
// and placed it here instead.
func setUpHealthStore() {
let typesToRead: Set = [
HKQuantityType.quantityType(forIdentifier: .bloodPressureSystolic)!
]
// I left the `toShare` as nil as I did not dig into adding bloodpressure reading to HealthKit.
healthStore?.requestAuthorization(toShare: nil, read: typesToRead, completion: { success, error in
if success {
self.calculateBloodPressureSystolic()
}
})
}
func calculateBloodPressureSystolic() {
guard let bloodPressureSystolic = HKObjectType.quantityType(forIdentifier: .bloodPressureSystolic) else {
// This should never fail when using a defined constant.
fatalError("*** Unable to get the bloodPressure count ***")
}
query = HKStatisticsQuery(quantityType: bloodPressureSystolic,
quantitySamplePredicate: nil,
options: .discreteAverage) {
query, statistics, error in
DispatchQueue.main.async{
self.valueTest = statistics?.averageQuantity()
}
}
healthStore!.execute(query!)
}
}然后像这样在你的ContentView中使用它。
import SwiftUI
struct ContentView: View {
@EnvironmentObject var healthStore: HealthStore
var body: some View {
Text("Hello, world!")
.onAppear {
healthStore.setUpHealthStore()
}
}
}我没有在.plist文件中设置适当的权限，但是您还需要设置Health Share使用描述和Health Update使用描述。我假设你已经这样做了，但我只是想提一下。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/67458210
复制相关文章
相似问题
腾讯云开发者
