Grouping values by date into arrays - cannot bridge from Obj-C

Question

I'm trying to take an array or JSON data and group the values in the array by date using the following code:

func groupTrips (trips: JSON) -> [[Trip?]] {
    let calendar = NSCalendar.currentCalendar()
    var groupedTrips:[[Trip?]] = []
    var group: [Trip] = []
    for (index, tripRaw):(String, JSON) in trips {
      let trip = Trip(trip: tripRaw)
      if index == "0" && calendar.compareDate(trip.pickup, toDate: NSDate.init(), toUnitGranularity: .Day) != .OrderedSame {
        groupedTrips.append([nil])
      }
      if let lastTrip = group.last {
        let order = calendar.compareDate(trip.pickup, toDate: lastTrip.pickup, toUnitGranularity: .Day)
        if order == .OrderedSame {
          group.append(trip)
        } else {
          groupedTrips.append(group)
          group = [trip]
        }
      } else {
        group.append(trip)
      }
    }
    groupedTrips.append(group)
    return groupedTrips
  }

When I try to run the code, I get an error on the 3rd to last line groupedTrips.append(group): Thead 1: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) And in my console, I get fatal error: array cannot be bridged from Objective-C. My Trip class is just a simple Swift class that parsed the JSON element into objects.

I don't really know if it's the best way to fix the issue but generally I change the class to a struct. Works unless you extend/implement something and if you don't mind that it's value type rather than a reference type. I believe that you can also generally fix it extending NSObject, but not so sure on that one. — Ted Huinink
– Ted Huinink, Commented Mar 21, 2016 at 15:00
@TedHuinink: It looks like changing to a struct worked. Probably a good idea if I want to use the simplest object type possible to contain values. Turn your comment into an answer and I'll mark it correct. — Dave Long
– Dave Long, Commented Mar 21, 2016 at 15:38

Ted Huinink · Accepted Answer · 2016-03-21 20:17:31Z

1

I don't really know if it's the best way to fix the issue but generally I change the class to a struct. Works unless you extend/implement something and if you don't mind that it's value type rather than a reference type.

answered Mar 21, 2016 at 20:17

Ted Huinink

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GetSwifty · Accepted Answer · 2016-03-21 16:47:52Z

1

You should look at Comparable. Implementing this in your Trip reference would allow you to use the sort() function. Apart from that, I would recommend digesting Swift's functional aspects. I think your code could be cleaned up and simplified significantly.

answered Mar 21, 2016 at 16:47

GetSwifty

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