How to access deeply nested dictionaries in Swift

Question

I have a pretty complex data structure in my app, which I need to manipulate. I am trying to keep track of how many types of bugs a player has in thier garden. There are te

Answer 1

You can use this extension:

extension Dictionary {

/// - Description
///   - The function will return a value on given keypath
///   - if Dictionary is ["team": ["name": "KNR"]]  the to fetch team name pass keypath: team.name
///   - If you will pass "team" in keypath it will return  team object
/// - Parameter keyPath: keys joined using '.'  such as "key1.key2.key3"
func valueForKeyPath  (_ keyPath: String) -> T? {
    let array = keyPath.components(separatedBy: ".")
    return value(array, self) as? T

}

/// - Description:"
///   - The function will return a value on given keypath. It keep calling recursively until reach to the keypath. Here are few sample:
///   - if Dictionary is ["team": ["name": "KNR"]]  the to fetch team name pass keypath: team.name
///   - If you will pass "team" in keypath it will return  team object
/// - Parameters:
///   - keys: array of keys in a keypath
///   - dictionary: The dictionary in which value need to find
private func value(_ keys: [String], _ dictionary: Any?) -> Any? {
    guard let dictionary = dictionary as? [String: Any],  !keys.isEmpty else {
        return nil
    }
    if keys.count == 1 {
        return dictionary[keys[0]]
    }
    return value(Array(keys.suffix(keys.count - 1)), dictionary[keys[0]])
}

}

Usage:

let dictionary = ["values" : ["intValue": 3]]
let value: Int = dictionary.valueForKeyPath("values.intValue")