Is there a way to pretty print Swift dictionaries to the console?

Question

NSDictionary *dictionary = @{@\"A\" : @\"alfa\",
                             @\"B\" : @\"bravo\",
                             @\"C\" : @\"charlie\",
                       


        

Answer 1

Details

• Xcode 10.2.1 (10E1001), Swift 5

Solution

extension Dictionary {
    func format(options: JSONSerialization.WritingOptions) -> Any? {
        do {
            let jsonData = try JSONSerialization.data(withJSONObject: self, options: options)
            return try JSONSerialization.jsonObject(with: jsonData, options: [.allowFragments])
        } catch {
            print(error.localizedDescription)
            return nil
        }
    }
}

Usage

let dictionary: [String : Any] = [
                                    "id": 0,
                                    "bool": true,
                                    "int_array": [1,3,5],
                                    "dict_array": [
                                        ["id": 1, "text": "text1"],
                                        ["id": 1, "text": "text2"]
                                    ]
                                 ]
print("Regualr print:\n\(dictionary)\n")
guard let formatedDictionary = dictionary.format(options: [.prettyPrinted, .sortedKeys]) else { return }
print("Pretty printed:\n\(formatedDictionary)\n")

Results

Answer 2

swift 5, xcode 10.3:

po print(<your Plist container>)

Answer 3

extension String {

    var conslePrintString: String {

        guard let data = "\""
            .appending(
                replacingOccurrences(of: "\\u", with: "\\U")
                    .replacingOccurrences(of: "\"", with: "\\\"")
            )
            .appending("\"")
            .data(using: .utf8) else {

            return self
        }

        guard let propertyList = try? PropertyListSerialization.propertyList(from: data,
                                                                             options: [],
                                                                             format: nil) else {
            return self
        }

        guard let string = propertyList as? String else {
            return self
        }

        return string.replacingOccurrences(of: "\\r\\n", with: "\n")
    }
}

let code in extension String and it works fine 

let string = "\(jsonDictionary)".conslePrintString

Answer 4

Casting a dictionary to 'AnyObject' was the simplest solution for me:

let dictionary = ["a":"b",
                  "c":"d",
                  "e":"f"]
print("This is the console output: \(dictionary as AnyObject)")

This is easier to read for me than the dump option, but note it won't give you the total number of key-values.