Question

我尝试选择HealthKit activitySummaries（iOS 9.3新增功能）

@available(iOS 9.3, watchOS 2.2, *)
func selectTodayActivitySummary (store: HKHealthStore, completion: ((summaryQuery: HKActivitySummaryQuery, summary: [HKActivitySummary]?, error: NSError?) -> Void)) {
    guard let calendar = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian) else {
        fatalError("*** This should never fail. ***")
    }

    let endDate = NSDate()

    guard let startDate = calendar.dateByAddingUnit(.Day, value: -7, toDate: endDate, options: []) else {
        fatalError("*** unable to calculate the start date ***")
    }

    let units: NSCalendarUnit = [.Day, .Month, .Year, .Era]

    let startDateComponents = calendar.components(units, fromDate: startDate)
    let endDateComponents = calendar.components(units, fromDate:endDate)


    // Create the predicate for the query
    let summariesWithinRange = HKQuery.predicateForActivitySummariesBetweenStartDateComponents(startDateComponents, endDateComponents: endDateComponents)
    //let summariesAtDate = HKQuery.predicateForActivitySummaryWithDateComponents(startDateComponents)

    let query = HKActivitySummaryQuery(predicate: summariesWithinRange) {
        (summaryQuery: HKActivitySummaryQuery, summary: [HKActivitySummary]?, error: NSError?) in

        completion(summaryQuery: summaryQuery, summary: summary, error: error)
    }

    store.executeQuery(query)
}

当我将此代码作为单元测试运行时，我得到一个例外 “NSInvalidArgumentException”，“startDateComponents：Date components需要一个日历。”

这段代码有什么问题？此代码几乎完全来自https://developer.apple.com/library/prerelease/ios/documentation/HealthKit/Reference/HKActivitySummaryQuery_Class/index.html

使用XCode 7.3 beta 4（7D152p），iPhone 6s Plus 9.3模拟器进行测试

Answer 1

calendar属性在startDateComponents和endDateComponents上必须是非零的（否则您希望解释组件的日历不明确）。很遗憾，当您致电NSCalendar时，components(_, fromDate:)并未填充该属性，因此您需要手动执行此操作：

let startDateComponents = calendar.components(units, fromDate: startDate)
startDateComponents.calendar = calendar
let endDateComponents = calendar.components(units, fromDate:endDate)
endDateComponents.calendar = calendar

选择HealthKit HKActivitySummary - ＆gt; “NSInvalidArgumentException”，“startDateComponents：Date components需要一个日历。”

1 个答案: