Question

有人可以帮助我按多个参数对自定义对象列表进行排序我想按date1和date2对它进行排序，并可选择b所有三个属性，但无论我尝试它失败:(
我的目标：

class MyObject : NSManagedObject{
   @NSManaged var date1:NSDate
   @NSManaged var date2:NSDate
   @NSManaged var key:Int
}

这是我尝试排序这些对象的列表失败：

var sortedArray1 = sorted(unorderedList, { (o1: MyObject, o2: MyObject) -> Bool in{
            return o1.date1 == o2.date1 ? (o1.date2 < o2.date2) : (o1.date1 < o2.date1)
        }

        var sortedArray2 = sorted(unorderedList, { (o1: MyObject, o2: MyObject) -> Bool in
            return (o1.date1.compare(o2.date1) == NSComparisonResult.OrderedAscending) == (o1.date1.compare(o2.date1) == NSComparisonResult.OrderedAscending) ? (o1.date2.compare(o2.date2) == NSComparisonResult.OrderedAscending) : (o1.date1.compare(o2.date1) == NSComparisonResult.OrderedAscending))
        });

Answer 1

尝试一下，让我知道：

unorderedList.sorted({
    if $0.date1 < $1.date1 {
        return true
    } else if $0.date1 == $date2 {
        return $0.date2 < $1.date2
    }
    return false
})

public func == (left: NSDate, right: NSDate) -> Bool {
    return left.isEqualToDate(right)
}

public func != (left: NSDate, right: NSDate) -> Bool {
    return !left.isEqualToDate(right)
}

public func > (left: NSDate, right: NSDate) -> Bool {
    return left.compare(right) == NSComparisonResult.OrderedDescending
}

public func < (left: NSDate, right: NSDate) -> Bool {
    return left.compare(right) == NSComparisonResult.OrderedAscending
}

如何通过对象的多个属性对自定义对象列表进行排序

1 个答案: