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我正在将旧代码转换为使用 SecureCoding 的 Swift 4。Apple 文档说这是一项要求，但是我的代码无法编译。我尝试更改 static、func、var 和 class 之间的声明，但是这些都不能转换为 Swift 4。

这是我尝试进行覆盖的代码：

 override public class func supportsSecureCoding() -> Bool {
        return true
    }

显示错误，表示方法没有覆盖其超类中的任何方法。 参考文件

这是包含解决方案的完整更新代码：

import CareKit

public class ZCCareMonthlySchedule : OCKCareSchedule  {

    var calendar: NSCalendar?

    public class func monthlyScheduleWithStartDate(startDate: NSDateComponents,  occurrencesFromJanuaryToDecember: [NSNumber], monthsToSkip: UInt, endDate: NSDateComponents?) -> ZCCareMonthlySchedule? {

        guard occurrencesFromJanuaryToDecember.count == 12
            else { return nil}

        //TODO: Requires fixing after CareKit is updated to handle sub classes

//        let schedule = super.initWithStartDate(startDate: startDate, endDate: endDate, occurrences: occurrencesFromJanuaryToDecember, timeUnitsToSkip: monthsToSkip)




        return nil

    }



    override public var type: OCKCareScheduleType {
        return OCKCareScheduleType.other
    }



    override public func numberOfEvents(onDate date: DateComponents) -> UInt {

        calendar = NSCalendar.init(calendarIdentifier: NSCalendar.Identifier.gregorian)
        calendar!.timeZone = NSTimeZone(abbreviation: "UTC")! as TimeZone


        let startMonth = calendar?.ordinality(of: NSCalendar.Unit.month, in: NSCalendar.Unit.era, for: self.startDate.date! )
        let endMonth = calendar?.ordinality(of: NSCalendar.Unit.month, in: NSCalendar.Unit.era, for: date.date! )
        let monthsSinceStart = startMonth! - endMonth!
        let month = calendar?.component(NSCalendar.Unit.month, from: date.date!)

        //TODO:  Add a unit test to verify this works
        let occurrences : UInt = ((UInt(monthsSinceStart) % (self.timeUnitsToSkip + 1)) == 0) ? self.occurrences[month!-1].uintValue : 0;

        return occurrences;
    }



    //MARK: NSSecureCoding Support


    override public static var supportsSecureCoding: Bool{
        return true
    }

    required convenience public init?(coder aDecoder: NSCoder) {

        self.init(coder: aDecoder)

    }

    //MARK: NSCopying Support
    override public func copy(with zone: NSZone?) -> Any {

        let theCopy = super.copy(with: zone) as! ZCCareMonthlySchedule

        return theCopy
    }

}
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1 回答 1

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感谢@Paulw11，答案是将其作为静态变量放入变量中，如下所示：

 override public static var supportsSecureCoding: Bool{
        return true
    }
于 2018-10-09T01:57:48.467 回答