ios - [ valueForUndefinedKey :]: this class is not key value coding-compliant for the key appointmentDate. '-swift

Question

我想对对象数组进行排序下面是我对对象数组进行排序的函数

    class func Fn_SortByParameter(arrayToSort:NSMutableArray,paramName:NSString!, isAscending:Bool!){
    var sortDescriptor:NSSortDescriptor = NSSortDescriptor(key: paramName, ascending: isAscending, selector: Selector("localizedCompare:"))
    var sortDescriptors:NSArray = NSArray(object: sortDescriptor)
    var sortedArray:NSArray = arrayToSort.sortedArrayUsingDescriptors(sortDescriptors)
    arrayToSort.removeAllObjects()
    arrayToSort.addObjectsFromArray(sortedArray)
}

和

class func Fn_SortByParameter(arrayToSort:NSMutableArray,paramName:NSString!, isAscending:Bool!){
    var sortDescriptor:NSSortDescriptor = NSSortDescriptor(key: paramName, ascending: isAscending)
    var sortDescriptors:NSArray = NSArray(object: sortDescriptor)
    var sortedArray:NSArray = arrayToSort.sortedArrayUsingDescriptors(sortDescriptors)
    arrayToSort.removeAllObjects()
    arrayToSort.addObjectsFromArray(sortedArray)
}

数组包含以下类的对象

class Appointment: NSObject {

     var id:Double!
      var status:NSString!
      var clinic:Clinic!
      var medicalCase:MedicalCase!
      var patient:Patient!
      var appointmentDate:Double! // Unix timestamp
      var reasonForVisit:NSString!
      var cancellationReason:NSString!
      var visit:Visit!
    }

当我尝试排序时它因以下错误而崩溃

[valueForUndefinedKey:]:此类与键 appointmentDate 的键值编码不兼容。'

排序函数调用

Fn_SortByParameter(allAppointments.aaData, paramName: "appointmentDate", isAscending: true)

Answer 1

您遇到的问题是像 Double! 这样的可选值类型没有暴露给 objective-c 运行时并且不可用于键值编码。

你可以让它成为非可选的:var appointmentDate:Double，使用一个 NSNumber 对象:var appointmentDate:NSNumber!，或者使用一个 Swift 数组和内置的-在 sorted 函数中。