CODEWITHSUNDEEP
swiftuitableviewdictionaryindexing
Vincent
Vincent

Reputation: 1645

Swift: dictionary access via index

I want to use values from a dictionary in my UITableViewCells. Can I get those from a dictionary by using indexPath.row for the value and indexPath.section for the key?

Upvotes: 18

Views: 27137

Answers (4)

Mahmut K.
Mahmut K.

Reputation: 850

You can use:

Array(yourDictionary)[indexPath.row].key // or .value

Upvotes: 4

Changnam Hong
Changnam Hong

Reputation: 1679

Here is my small trick to access Dictionary by index. Just wrap dictionary!

var dict = [String: [Int]]()

dict.updateValue([1, 2, 3], forKey: "firstKey")
dict.updateValue([3, 4, 5], forKey: "secondKey")

var keyIndex = ["firstKey": "firstKey", "secondKey": "secondKey"]
var arr = [[String: [Int]]]()

for (key, value) in dict {
    arr.append([keyIndex[key]!: value])
}

print(arr[0]) // ["firstKey": [1, 2, 3]]

Upvotes: 0

Duncan C
Duncan C

Reputation: 131408

Dictionaries are inherently unordered. If you use dictionary.keys, you can get an array of keys and use that, as @Firas says in his/her answer, but there's no guarantee that next time you fetch an array of keys they will be in the same order.

Another option would be to use Int as the key type, then use the indexPath.row as the key.

It's really better to use an array as a data source for a table view.

If you want to store the values for a sectioned table view in a dictionary you should use an outer section array, which contains an inner row array, which contains a dictionary of values for the cell.

Upvotes: 9

Firas
Firas

Reputation: 1752

you can get the keys array and get the key at indexPath.section like this:

Array(yourDictionary.keys)[indexPath.section]

and you can get the value at indexPath.row from the values array like this:

Array(yourDictionary.values)[indexPath.row]

Edit:

if you want to get the values of a specific section key you should write:

let key = Array(yourDictionary.keys)[indexPath.section]
let array = yourDictionary[key]
let value = array[indexPath.row]

Upvotes: 65

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