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Convert Swift Dictionary to String

Tags:

swift

ios8

For testing and debugging I am trying to put the content of Dictionary to a String. But have no clue hows it going to achieve. Is it possible? If yes, how.

Dictionary is fetched from web service so I have no idea the key values it have. I want to use the data in app.

In Objective C %@ was enough to store anything in NSString.

like image 222
khunshan Avatar asked Oct 14 '14 23:10

khunshan


4 Answers

Just use the description property of CustomStringConvertible as

Example:

Note: Prior to Swift 3 (or perhaps before), CustomStringConvertible was known as Printable.

like image 176
GoZoner Avatar answered Sep 29 '22 01:09

GoZoner


Dictionary to string with custom format:

let dic = ["key1":"value1", "key2":"value2"]

let cookieHeader = (dic.flatMap({ (key, value) -> String in
    return "\(key)=\(value)"
}) as Array).joined(separator: ";")

print(cookieHeader) // key2=value2;key1=value1
like image 45
Jano Avatar answered Sep 29 '22 01:09

Jano


Jano's answer using Swift 5.1:

let dic = ["key1": "value1", "key2": "value2"]
let cookieHeader = dic.map { $0.0 + "=" + $0.1 }.joined(separator: ";")
print(cookieHeader) // key2=value2;key1=value1
like image 23
vauxhall Avatar answered Oct 03 '22 01:10

vauxhall


You can just print a dictionary directly without embedding it into a string:

let dict = ["foo": "bar", "answer": "42"]

println(dict)
// [foo: bar, answer: 42]

Or you can embed it in a string like this:

let dict = ["foo": "bar", "answer": "42"]

println("dict has \(dict.count) items: \(dict)")
  // dict has 2 items: [foo: bar, answer: 42]
like image 38
Abhi Beckert Avatar answered Oct 01 '22 01:10

Abhi Beckert