Cant set Array in NSUserDefaults

Question

var arr = defaults.arrayForKey("kWeeks") as [WeekReport]?
if arr? {
    var arr2 = arr!
    arr2.append(report)
    defaults.setObject(arr2, forKey: "kWeeks")           // Crash
    defaults.synchronize()
}

I try to set arr2 which will be the add after optional checking. But it crashes on setObject() with error: EXC_BAD_ACCESS

Ive checked, with println() and arr2 is not nil and contains the element which is appended in the sample above. And report is of type WeekReport.

drewag · Accepted Answer · 2014-08-03T17:58:33.953

0

var arr = defaults.arrayForKey("kWeeks") as [WeekReport]?

Is doing a forced casting to an optional array of WeekReport. Instead, you really want to do an optional casting:

if let arr = defaults.arrayForKey("kWeeks") as? [WeekReport] {
    arr.append(report)
    defaults.setObject(arr, forKey: "kWeeks")
    defaults.synchronize()
}

This says, "if there is an array for "kWeeks" that can be cast to an array of WeekReport, do the following with it as arr"

You also need to make sure that WeekReport inherits from the NSCoding protocol so that it can be converted to data.

edited Aug 03 '14 at 17:58

answered Aug 03 '14 at 17:57

drewag

93,393
28
139
128

Hmm im still getting the error though and the ass should be a var here. – Arbitur Aug 03 '14 at 18:00
1

@Arbitur, does WeekReport inherit from NSObject and implement the NSCoding protocol? – drewag Aug 03 '14 at 18:00
yeah I just thought of that why it is crashing and it does have the NSCoding protocol I just have to Archive it... – Arbitur Aug 03 '14 at 18:04
@Arbitur what is the call stack when the crash occurs? – drewag Aug 03 '14 at 18:11

Cant set Array in NSUserDefaults

1 Answers1