Grab specific value from middle of JSON String in Swift 4 - json

Question

I'm looking to extract only the link from this string and create a new string with that link, but I'm not sure of the best way to go about doing so. If anyone could enlighten me on how I can do this effectively I would greatly appreciate it!
String
{
"timestamp": 1509507857555,
"profileId": "e58d7f751c7f498085a79a37bf22f20b",
"profileName": "Rhidlor",
"textures": {
"SKIN": {
"url": "http://textures.minecraft.net/texture/1137b867b4a2fb593cf6d05d8210937cc78bc9e0558ad63d41cc8ec2f99e7d63"
}
}
}

Answer 1

Your given string is JSON. You can get url from given JSON is like this :
struct Response: Decodable {
var textures: [String: Textures]
}
struct Textures: Decodable {
var url: String
}
let jsonStr = """
{"timestamp":1509507857555,"profileId":"e58d7f751c7f498085a79a37bf22f20b","profileName":"Rhidlor","textures":{"SKIN":{"url":"http://textures.minecraft.net/texture/1137b867b4a2fb593cf6d05d8210937cc78bc9e0558ad63d41cc8ec2f99e7d63"}}}
"""
let data = jsonStr.data(using: .utf8)!
let decoder = JSONDecoder()
do {
let jsonData = try decoder.decode(Response.self, from: data)
if let skin = jsonData.textures["SKIN"] {
print(skin.url)
}
}
catch {
print("error:\(error)")
}

Answer 2

You can use these ways for fetch an url inside of any String.
Swift4
let testString: String = "{\"timestamp\":1509507857555,\"profileId\":\"e58d7f751c7f498085a79a37bf22f20b\",\"profileName\":\"Rhidlor\",\"textures\":{\"SKIN\":{\"url\":\"http://textures.minecraft.net/texture/1137b867b4a2fb593cf6d05d8210937cc78bc9e0558ad63d41cc8ec2f99e7d63\"}}}"
let pat = "http?://([-\\w\\.]+)+(:\\d+)?(/([\\w/_\\.]*(\\?\\S+)?)?)?"
let regex = try! NSRegularExpression(pattern: pat, options: [])
let matches = regex.matches(in: testString, options: [], range: NSRange(location: 0, length: LGSemiModalNavViewController.characters.count))
var matchedUrls = [String]()
for match in matches {
let url = (htmlSource as NSString).substring(with: match.range)
matchedUrls.append(url)
}
print(matchedUrls)
Objective - C
NSString *testString = #"{\"timestamp\":1509507857555,\"profileId\":\"e58d7f751c7f498085a79a37bf22f20b\",\"profileName\":\"Rhidlor\",\"textures\":{\"SKIN\":{\"url\":\"http://textures.minecraft.net/texture/1137b867b4a2fb593cf6d05d8210937cc78bc9e0558ad63d41cc8ec2f99e7d63\"}}}";
NSError *error;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:#"http?://([-\\w\\.]+)+(:\\d+)?(/([\\w/_\\.]*(\\?\\S+)?)?)?" options:NSRegularExpressionCaseInsensitive error:&error];
NSArray *arrayOfAllMatches = [regex matchesInString:testString options:0 range:NSMakeRange(0, [testString length])];
NSMutableArray *arrayOfURLs = [NSMutableArray new];
for ( NSTextCheckingResult *match in arrayOfAllMatches ) {
NSString *substringForMatch = [testString substringWithRange:match.range];
NSLog(#"Extracted URL: %#", substringForMatch);
[arrayOfURLs addObject:substringForMatch];
}
NSLog(#"%#",arrayOfURLs);