I am trying to sum nested data without success.
This is my data:
{
"BON_PK" = 34;
"BON_EXTRA" = "100.00";
Line = ({ "LIG_PRICE" = "40.80";},
{ "LIG_PRICE" = "40.80";})
},
{
"BON_PK" = 35;
"BON_EXTRA" = "10.00";
Line = ({"LIG_PRICE" = "40.80";},
{"LIG_PRICE" = "40.80";})})
This is what I tried:
vPrice = vArr.map {$0?.Line!.map {(($0.LIG_PRICE as NSString).floatValue)}}.reduce(0, +)
This one is working but not the nested one:
vDelTotal = vArrBon.map { ($0?.BON_EXTRA!.toFloat)! }.reduce(0, +)
I created a 'toFloat' Function that is not working with the nested one.
I have this error message:
Cannot convert value of type '[Float]?' to closure result type 'Float'
Related
Dispatching the queue messes up the order in the array as noted below. I'm trying to rank the array and then be able to translate it. So far its not working:
let top5 = Array(labels.sorted{ $0.confidence > $1.confidence}.prefix(upTo:5))
for lulu in top5 {
let translator = ROGoogleTranslate()
var params = ROGoogleTranslateParams()
params.source = "en"
params.target = "es"
params.text = "\(String(describing: lulu.label))"
translator.translate(params: params, callback: { (result) in
DispatchQueue.main.async {
self.textUno.text = self.textUno.text! + "\(lulu.label)" + " \(lulu.confidence*100)\n"
self.textDos.text = self.textDos.text! + "\(result)\n"
self.view.addSubview(self.textUno)
self.view.addSubview(self.textDos)
}
})
}
If I try to put the sorting out of DispatchQueue.main.async then the translation won't be lined up with the right word.
How can I fix this so that the array is sorted and the translation matches up ?
Translate the array first before ranking them.
Make it simpler first and make sure it is working and then put all the parts together.
If you really want to do it this way you will need to put them into a temporary array after sorting them and then use that at the end.
This, as you said, will return a jumbled result.
The below example is pretty close, needs a bit of a polish but you should be able to do it from this.
let top5 = Array(labels.sorted{ $0.confidence > $1.confidence}.prefix(upTo:5))
var tmparr : []
var count: Int = 0
for lulu in top5 {
let translator = ROGoogleTranslate()
count = count + 1
var params = ROGoogleTranslateParams()
params.source = "en"
params.target = "es"
params.text = "\(String(describing: lulu.label))"
params.ordernumber = count
translator.translate(params: params, callback: { (result) in
tmparr.append[params]
})
}
DispatchQueue.main.async {
for lulunew in tmparr {
if (lulunew.ordernumber == correctindex){
self.textUno.text = self.textUno.text! + "\(lulu.label)" + " \(lulu.confidence*100)\n"
self.textDos.text = self.textDos.text! + "\(result)\n"
self.view.addSubview(self.textUno)
self.view.addSubview(self.textDos)
}
}
}
Here is my JSON response for a particular API.
Case 1
ChallengeConfiguration = {
AnswerAttemptsAllowed = 0;
ApplicantChallengeId = 872934636;
ApplicantId = 30320480;
CorrectAnswersNeeded = 0;
MultiChoiceQuestion = (
{
FullQuestionText = "From the following list, select one of your current or previous employers.";
QuestionId = 35666244;
SequenceNumber = 1;
},
{
FullQuestionText = "What color is/was your 2010 Pontiac Grand Prix?";
QuestionId = 35666246;
SequenceNumber = 2;
}
)
}
The key "MultiChoiceQuestion" returns an array with two questions. So here is my code.
let QuestionArray:NSArray = dict1.objectForKey("ChallengeConfiguration")?.objectForKey("MultiChoiceQuestion") as! NSArray
Case 2
ChallengeConfiguration =
{
AnswerAttemptsAllowed = 0;
ApplicantChallengeId = 872934636;
ApplicantId = 30320480;
CorrectAnswersNeeded = 0;
MultiChoiceQuestion = {
FullQuestionText = "From the following list, select one of your
current or previous employers.";
QuestionId = 35666244;
SequenceNumber = 1;
}
}
For Case 2 my code does not work and app crashes because it returns a dictionary for that specific Key. So how could I write a generic code that would work for all objects?
It looks like the key can contain either an array of dictionary values or a dictionary, so you just need to try casting to see which one you have.
so I would likely do it like this:
if let arr = dict1.objectForKey("ChallengeConfiguration")?.objectForKey("MultiChoiceQuestion") as? Array {
// parse multiple items as an array
} else if let arr = dict1.objectForKey("ChallengeConfiguration")?.objectForKey("MultiChoiceQuestion") as? [String:AnyObject] {
// parse single item from dictionary
}
You should never really use ! to force unwrap something unless you are completely certain that the value exists and is of the type you are expecting.
Use conditional logic here to test the response and parse it safely so that your app doesn't crash, even in failure.
I'm using an API to get weather condition and the retrieved dict is
dict = {
base = stations;
clouds = {
all = 92;
};
cod = 200;
coord = {
lat = "31.23";
lon = "121.47";
};
dt = 1476853699;
id = 1796231;
main = {
"grnd_level" = "1028.63";
humidity = 93;
pressure = "1028.63";
"sea_level" = "1029.5";
temp = "73.38";
"temp_max" = "73.38";
"temp_min" = "73.38";
};
name = "Shanghai Shi";
rain = {
3h = "0.665";
};
sys = {
country = CN;
message = "0.0125";
sunrise = 1476827992;
sunset = 1476868662;
};
weather = (
{
description = "light rain";
icon = 10d;
id = 500;
main = Rain;
}
);
wind = {
deg = "84.50239999999999";
speed = "5.97";
};
}
If I want the value of humidity, I just use
let humidityValue = dict["main"]["humidity"] and it works.
But the problem is I also want to get the value of description in weather
when I used let dscptValue = dict["weather"]["description"]
it retrieved nil.
How's that? and I notice there are two brackets around weather .I'm not sure whether it is the same with the statement without brackets.
weather = (
{
description = "light rain";
icon = 10d;
id = 500;
main = Rain;
}
);
How to get the value of description?
weather keys contains Array of Dictionary not directly Dictionary, so you need to access the first object of it.
if let weather = dict["weather"] as? [[String: AnyObject]], let weatherDict = weather.first {
let dscptValue = weatherDict["description"]
}
Note: I have used optional wrapping with if let for preventing crash with forced wrapping.
Weather is an array of dictionaries.
dict["weather"][0]["description"]
may give you the expected result.
I am trying to access a key from the following JSON:
{ items = ({a = “string for a”;b = “string for a”;c = “string for a”;},{a = “string for a”;b = “string for a”;c = “string for a”;},{a = “string for a”;b = “string for a”;c = “string for a”;});}
For example, I would like to get the value for the first key 'a', but the following returns nil:
println(jsonResult["products[product_id]"]
Your JSON Example is not valid. Check out with this:
http://jsoneditoronline.org/
I would use a common JSON Plugin for Swift. For Example this:
https://github.com/owensd/json-swift
And then use:
let json : JSON = "your string"
And get your objects with:
if let myproduct = json["products"]["productid"].array {
// content of your product (if array)
}
I have an application which retrieves a JSON file. Here you are a piece of my code:
Array definition
var photos: NSArray = []
How I populate the array:
ezJson().createRequest("http://myapiurl/load", type: "GET", params: nil, completion: {(returnedObject : AnyObject?, error : NSError?)in
if returnedObject{
self.photos = returnedObject as NSArray
self.tableView.reloadData()
}
})
println(self.photos)
{
created = {
date = "2014-06-13 18:35:46";
timezone = "Europe/Madrid";
"timezone_type" = 3;
};
description = description1;
id = 3;
name = 539b286277617;
},
{
created = {
date = "2014-06-13 18:38:38";
timezone = "Europe/Madrid";
"timezone_type" = 3;
};
description = description2;
id = 4;
name = 539b290ed8577;
}
println(self.photos[0])
{
created = {
date = "2014-06-13 18:35:46";
timezone = "Europe/Madrid";
"timezone_type" = 3;
};
description = description1;
id = 3;
name = 539b286277617;
}
The problem is, I don't know how to get a particular item. I've tried:
println(self.photos[0]) // it works
println(self.photos[0]["name"] // Xcode crash "Command /Applications/Xcode6-Beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift failed with exit code 254"
println(self.photos[0].name) // returns nil
How can I access to the name parameter ?
It seems that you are casting a String to NSArray. This won't give you the effect that you want.
First of all, if you want to acces your elements by name, you want an NSDictionary.
Then it propably still won't work, as there is no implicit conversion between the types so you will have to either parse it yourself or use some JSON library.
Last : your JSON is incorrect.