如何检测用户通过设置撤销HealthKit权限并做出响应？

问题场景 #

使用Apple HealthKit构建应用时，通过SwiftUI的.onAppear在View加载时请求睡眠数据读写权限，正常情况可获取数据，但用户通过系统设置撤销权限后，应用直接崩溃。现有实现代码如下：

View代码 #

@State var authorized: Bool = false
@State var initTextContent: String = ""

var body: some View {
    Text("\(initTextContent)")
        .onAppear {
            healthstore.getHealthAuthorization(completionAuth: { success in
                authorized = success
                
                if self.authorized == true {
                    healthstore.getSleepMetrics(startDate: sevendaysAgo, endDate: sevendaysAfter, completion: sleepDictAssign)
                } else {
                    initTextContent = "Required Authorization Not Provided"
                }
            })
        }
}

HealthStore类代码 #

class HealthStoreManager {
    let healthStore = HKHealthStore()
    private let sleepSampleType = HKObjectType.categoryType(forIdentifier: .sleepAnalysis)!
    
    func getHealthAuthorization(completionAuth: @escaping (Bool) -> Void) {
        healthStore.requestAuthorization(toShare: [sleepSampleType], read: [sleepSampleType]) { (success, error) in
            if let error = error {
                // 原代码使用fatalError直接崩溃
                fatalError("*** An error occurred \(error.localizedDescription) ***")
            } else {
                completionAuth(success)
            }
        }
    }
    
    // 假设存在getSleepMetrics方法
    func getSleepMetrics(startDate: Date, endDate: Date, completion: @escaping ([String: Any]) -> Void) {
        // 数据获取逻辑
    }
}

核心问题分析 #

1. 崩溃原因：fatalError会直接终止应用，当用户撤销权限后，调用requestAuthorization会返回权限相关错误，触发fatalError导致崩溃。
2. 权限请求限制：用户明确拒绝或撤销权限后，requestAuthorization不会再次弹出权限请求弹窗，必须引导用户到系统设置手动开启。

解决方案 #

1. 移除致命错误，优雅处理权限错误 #

修改getHealthAuthorization方法，去掉fatalError，改为通过回调传递错误或状态：

func getHealthAuthorization(completionAuth: @escaping (Bool, Error?) -> Void) {
    healthStore.requestAuthorization(toShare: [sleepSampleType], read: [sleepSampleType]) { (success, error) in
        completionAuth(success, error)
    }
}

2. 主动检测当前权限状态 #

在请求权限前，先检查当前的权限状态，避免无效的请求操作：

func checkSleepAuthorizationStatus() -> HKAuthorizationStatus {
    return healthStore.authorizationStatus(for: sleepSampleType)
}

3. 修改View逻辑，处理权限撤销场景 #

在.onAppear中先检查权限状态，再决定后续操作，同时处理权限被拒绝的引导逻辑：

@State var authorized: Bool = false
@State var initTextContent: String = ""
@State var showSettingsAlert = false

var body: some View {
    Text("\(initTextContent)")
        .onAppear {
            checkAndRequestAuthorization()
        }
        .alert("需要权限", isPresented: $showSettingsAlert) {
            Button("取消", role: .cancel) {}
            Button("去设置") {
                guard let settingsURL = URL(string: UIApplication.openSettingsURLString) else { return }
                UIApplication.shared.open(settingsURL)
            }
        }
}

private func checkAndRequestAuthorization() {
    let status = healthstore.checkSleepAuthorizationStatus()
    
    switch status {
    case .sharingAuthorized:
        authorized = true
        healthstore.getSleepMetrics(startDate: sevendaysAgo, endDate: sevendaysAfter, completion: sleepDictAssign)
    case .notDetermined:
        // 用户还未选择权限，发起请求
        healthstore.getHealthAuthorization(completionAuth: { [weak self] success, error in
            guard let self = self else { return }
            if success {
                self.authorized = true
                self.healthstore.getSleepMetrics(startDate: self.sevendaysAgo, endDate: self.sevendaysAfter, completion: self.sleepDictAssign)
            } else {
                self.initTextContent = "未获得必要权限"
                self.showSettingsAlert = true
            }
        })
    case .sharingDenied, .unknown:
        // 用户已拒绝或撤销权限，引导去设置
        initTextContent = "权限已被拒绝"
        showSettingsAlert = true
    @unknown default:
        initTextContent = "无法获取权限状态"
    }
}

4. 确保数据获取方法的安全校验 #

在getSleepMetrics中增加权限校验，避免无权限时执行数据获取逻辑：

func getSleepMetrics(startDate: Date, endDate: Date, completion: @escaping ([String: Any]) -> Void) {
    let status = checkSleepAuthorizationStatus()
    guard status == .sharingAuthorized else {
        completion([:]) // 或传递错误信息
        return
    }
    
    // 原数据获取逻辑
}

关键说明 #

• 用户拒绝权限后，系统不会再允许应用弹出权限请求框，必须引导用户到系统设置手动开启。
• 每次访问HealthKit数据前，都应该先检查权限状态，避免因权限变化导致崩溃。

内容的提问来源于stack exchange，提问作者Zo Ahmed