How to get the JSON data

Question

I want to make an app that calls the API of forecast.io to get weather in my app. Someone said me to use SwiftyJSON and Alamofire . I'm new to programming and this is my first app so I don't really know how to do it right. That's my code for now , but I don't know if it is right or not , it works but the call isn't made and I need to enter the JSON data to get the "temperature" data:

// Get Weather
let URL = "https://api.forecast.io/forecast/apikey/\(lat),\(long)"
Alamofire.request(.GET, URL, parameters: nil)
    .responseJSON { response in
        let jsonData: AnyObject?
        do {
            jsonData = try NSJSONSerialization.JSONObjectWithData(response.data!, options: [])
        } catch  {                                                               
            
        }            
}

It only says that "jsonData" was never used. That's all I wrote for getting the call.

What's the issue that you are facing with this? Can you be a little clearer? — kabiroberai
– kabiroberai, Commented Nov 9, 2015 at 17:23
I don't know how to enter in JSON to get data like "temperature" , like the syntax I have to enter in "catch" — perteadi
– perteadi, Commented Nov 9, 2015 at 17:25

perteadi · Accepted Answer · 2016-09-07 14:09:15Z

2

Once you have the jsonData variable, you can use it like a regular NSDictionary by putting the following lines in the do block after the first line

guard let jsonDict = jsonData as? NSDictionary else {return}

If you want to get the current forecast, all you have to do is

guard let currentForecast = jsonDict["currently"] as? NSDictionary else {return}

And then you can get its properties using this link

guard let temperature = currentForecast["apparentTemperature"] as? Int else {return}

All in all, your code should look something like this

let URL = "https://api.forecast.io/forecast/apikey/\(lat),\(long)"
Alamofire.request(.GET, URL, parameters: nil)
    .responseJSON { response in
        let jsonData: AnyObject?
        do {
            jsonData = try NSJSONSerialization.JSONObjectWithData(response.data!, options: [])
            guard let jsonDict = jsonData as? NSDictionary else {return}
            guard let currentForecast = jsonDict["currently"] as? NSDictionary else {return}
            guard let temperature = currentForecast["apparentTemperature"] as? Int else {return}
            print(temperature)
        } catch  {
            //TODO: Handle errors
        }
}

The catch block is to handle errors, so if it could not parse the JSON that's where you would display an alert saying that there was an error.

edited Sep 7, 2016 at 14:09

perteadi

1313 bronze badges

answered Nov 9, 2015 at 17:30

kabiroberai

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12 Comments

trojanfoe Over a year ago

Why the use of as!? They can certainly be nul.

kabiroberai Over a year ago

@trojanfoe I was just explaining how it works so it is clear to the OP. I'll just update the answer though.

perteadi Over a year ago

So my code should look like this: ' do { jsonData = try NSJSONSerialization.JSONObjectWithData(response.data!, options: []) guard let jsonDict = jsonData as? NSDictionary else {return} let currentForecast = jsonDict["currently"] as! NSDictionary let temperature = currentForecast["apparentTemperature"] as! Int } catch { // TODO: handle errors } } ' @kabiroberai

kabiroberai Over a year ago

@perteadrian yup. Btw check out my updated answer, as it is a bit safer

perteadi Over a year ago

Thank's a lot @kabiroberai !!

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