Issues adding NSIndexPath as key and NSNumber as value in Dictionary? - swift

Question

Second object of quickFilterDictionary in self.preferencesListFilterDictionary is nil. How to add [NSIndexPath] index path (as key) and NSNumber (as value) in Dictionary?
Note: first object is added successfully, only the 2nd object is nil when I printed self.preferencesListFilterDictionary in console. May I know , what am I doing wrong in below code?
self.preferencesListFilterDictionary["price"] = 1000
self.quickFilterArr = [localizedStrOf("deliveryNowOnly"),localizedStrOf("rated")]
var quickFilterDictionary = Dictionary<NSIndexPath, NSNumber?>()
for obj in self.quickFilterArr {
let row = self.quickFilterArr.indexOf(obj)
let indexPath = NSIndexPath(forRow:row!, inSection: 0)
quickFilterDictionary[indexPath] = NSNumber(bool: false)
}
print(quickFilterArr.count)
print(quickFilterDictionary)
self.preferencesListFilterDictionary.updateValue(quickFilterDictionary as? AnyObject, forKey: "quickFilterDictionaryKey")
print(self.preferencesListFilterDictionary)
console print:
▿ [1] : 2 elements
- .0 : "quickFilterDictionaryKey"
- .1 : nil
To get above dictionary bool from number, I wrote following code -
func getQuickFilterValueOfIndexpath(indexPath:NSIndexPath) -> Bool {
if let val = self.preferencesListFilterDictionary["quickFilterDictionaryKey"] {
// now val is not nil and the Optional has been unwrapped, so use it
let tempDict = val as! Dictionary<NSIndexPath, NSNumber?>
if let boolVal = tempDict[indexPath] {
return boolVal!
}
}
return false
}

Answer 1

I think you are confused on the difference between a Row, an IndexPath, and an Index.
In the following code:
let row = self.quickFilterArr.indexOf(obj)
If you option click on row, you will see that it is an object of type Array.Index?. It is not an row.
Also is there a reason you are using NSNumber, NSIndexPath and update value for key? As opposed to Number, IndexPath and just updating your dictionary values with:
preferencesListFilterDictionary["quickFilterDictionaryKey] = quickFilterDictionary
If you option click on quickFilterArr and it is an array of IndexPaths [IndexPath] - To reference the IndexPath at your chosen index in that array you would just do:
if let arrayIndex = quickFilterArr.indexOf(obj) {
//if your array is an array of Index Paths
//you would then pull the IndexPath object at the index you have defined above
let indexPath = quickFilterArr[arrayIndex]
quickFilterDictionary[indexPath] = Number(bool: false)
}