Swift 4 : how to write/load structure from file

Question

I'm new to Swift.. (And its my first post here!)

I'm using Swift 4 with Xcode 9 and I'm actually trying to save a variable that contains structure to a file, and then reload it again into that variable.

Here is the data I want to save:

var MyVar = [
structure(data1: "48.1", data2: "-10.1", Name: "aaa", Date: "2013-12-01 03:22:32", Age: 20),
structure(data1: "47.7", data2: "-79.2", Name: "bbb", Date: "2011-10-15 12:58:45", Age: 21),
structure(data1: "50.5", data2: "75.8", Name: "ccc", Date: "2014-05-24 02:42:25", Age: 35),
structure(data1: "48.7", data2: "78.5", Name: "ddd", Date: "2017-10-10 15:56:13", Age: 5)]

could you please tell me the easiest way to save and reload this variable?

for things like that you should use a database (like [realm](https://realm.io/docs/swift/latest/)) — Sandu, Apr 26 '18 at 13:04
Possibly Related: https://stackoverflow.com/questions/33637377/how-to-save-an-array-of-custom-structs-to-plist-swift — Ahmad F, Apr 26 '18 at 13:06

score 1 · Accepted Answer · answered Apr 26 '18 at 13:04

1

Make the type of your structure conform to Codable protocol
Use PropertyListEncoder to encode and decode to property list
Store that property list to the file system.

See https://developer.apple.com/documentation/foundation/archives_and_serialization/encoding_and_decoding_custom_types

answered Apr 26 '18 at 13:04

Marmoy

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Thanks, after a lot of learning on different web site i finally make it work with your instruction..! – Pascal N Apr 27 '18 at 11:31

score 0 · Answer 2 · answered Apr 27 '18 at 14:00

0

You might want to use local JSON file that holds your data. You can then use Swift 4 Codable / Decodable to load that file.

You will also be able to save it back to a local JSON if you want to.

Is that what you want to do?

answered Apr 27 '18 at 14:00

Dan Korkelia

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Swift 4 : how to write/load structure from file

2 Answers2