Appending dictionary values to array in Swift - arrays

Question

I have a dictionary of type
[String: Object], where MyObject is an array of AnotherObject. I need to have it sorted as I need to fill an UITableView with Keys.countnumber of sections and Object.count number of rows in each section. I put all the keys in an array, but when I try to append the values into another array I get Thread 1: EXC_BAD_ACCESS (code=1, address=0x8).
This is the code I'm using
var dictionary = [String: MyObject]()
var sortedKeys: [String]?
var sortedValues = [MyObject]()
func sortItems() {
self.sortedKeys = self.dictionary.keys.sorted(by: >)
let sortedDict = self.dictionary.sorted(by: {$0.key > $1.key})
for (_, value) in sortedDict {
print(value)
self.sortedValues.append(value)
}
}
In the for loop, when I don't try to append the values to the array, it prints all the sorted values, the problem comes when I want to have them in an Array.
Edit
The dictionary is like this:
struct Object: Decodable {
let elements: [AnotherObject]
}
struct AnotherObject: Decodable {
let time, Id, Status: Int?
let date, startTime, endTime: String?
}
dictionary: [String: Object]
So the keys are numbers (representing days) and every day has an Object with (at least) one anotherObject.
I get the JSON from the API.
Thanks in advance

Answer 1

You should only sort the keys and then use that array to select from the dictionary and append your sortedValues array. I made the sortedKeys into a local variable
func sortItems() {
let sortedKeys = self.dictionary.keys.sorted(by: >)
for key in sortedKeys {
if let obj = dictionary[key] {
self.sortedValues.append(obj)
}
}
}
I don't know if this will make a difference in regard to the crash but another way is to let the function return an array
func sortItems() -> [Object] {
let sortedKeys = self.dictionary.keys.sorted(by: >)
var result: [Object]()
for key in sortedKeys {
if let obj = dictionary[key] {
result.append(obj)
}
}
return result
}
and then call it
self.sortedValues = sortItems()

Answer 2

You don't use sortedKeys at all and the result of sorting a dictionary is an array of tuples so the dictionary enumeration syntax for (key, value) in is wrong
Probably you want this
func sortItems() {
let sortedKeys = self.dictionary.keys.sorted(by: >)
for key in sortedKeys {
let value = self.dictionary[key]!
print(value)
self.sortedValues.append(value)
}
}
Force unwrapping the value is 100% safe as the key clearly exists.