How to covert byte array to pdf in swift 3 xcode 8.3

Question

Created Jul ’17

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Hi Guys,

I have a java api that returns me a json with the pdf document as byte array. I need to convert byte array to pdf in swift 3.

Thanks in advance

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Answer 1

DTS Engineer OP

Apple

Jul ’17

There’s three parts to this:

Parsing JSON in general (A)
Converting a JSON byte array to a Swift
```
Data
```
value (B)
Using that as a PDF (C)

Reading through your question I wasn’t sure which bit you’re stuck on but I suspect it’s B. If so, here’s a small snippet that shows how you can do this:

import Foundation

let json = "{ \"bytes\": [12, 34, 56, 78] }"
let jsonData = json.data(using: .utf8)!
let jsonRoot = (try! JSONSerialization.jsonObject(with: jsonData, options: [])) as! [String: Any]
let bytes = jsonRoot["bytes"] as! [UInt8]
let data = Data(bytes)
print(data as NSData)

Lines 1 through 4 are there solely to set up some test data. Lines 5 and 6 parse the JSON to get the byte array. Line 7 is key: it constructs a

Data

value from the array of

UInt8

. Line 8 prints the result, namely:

<0c22384e>

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