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iOS

Posted by Dawid Cedrych
Dawid Cedrych
15,108 Points

How to get json array in swift?

I finished the weather app called Stormy in swift, that was a really useful course for me. However, I attempted to apply gained skills in practice and encountered a big problem. My JSON data is JSON Array, not object, I've changed the code in such way that each NSDictionary in JSON serialization is replaced with NSArray. But unfortunately it's not working at all( Still following error occurs: EXC_BREAKPOINT (code=EXC_I386_BPT, subcode=0x0) error )

I showed my problem in stackoverflow forum, unfortunately without any response ( http://stackoverflow.com/questions/27234541/json-array-deserialization-in-swift-still-getting-the-exc-breakpoint-code-exc ). I decided to post it here as my code is exactly the same as in your weather app.

Pasan Premaratne or Amit Bijlani , would you guys be so kind to take a look at my issue?

Thanks in advace

4 Answers

Stephen Whitfield
Stephen Whitfield
16,771 Points

Looks like your syntax is all wrong. By the way, just a suggestion, you don't need to specify a return type Void for your function. Just form it the way I have in my correction code. 

func getCurrentLunchData()
{
    let lunchURL = NSURL(string: "http://92.222.218.68:3000/lunches/getlunches.json?c_lat=50.2&c_lon=19.9")
    let sharedSession = NSURLSession.sharedSession()    
    let downloadTask: NSURLSessionDownloadTask = sharedSession.downloadTaskWithURL(lunchURL!, completionHandler: { (url: NSURL!, response: NSURLResponse!, error: NSError!) -> Void in
        if (error == nil) {
            let dataObject = NSData(contentsOfURL: lunchURL!)
            let restaurantArray: NSArray = NSJSONSerialization.JSONObjectWithData(dataObject!, options: nil, error: nil) as NSArray
            //let nearbyRestaurants = Restaurant(restaurantArray: restaurantArray)
            dispatch_async(dispatch_get_main_queue(), { () -> Void in

                println("Insert UI here")
            })
        }
    })
    downloadTask.resume()
}
Dawid Cedrych
Dawid Cedrych
15,108 Points
Dawid Cedrych
Dawid Cedrych
15,108 Points

Thank you. My syntax was ok, the error I had was a runtime error. Another thing is, the code you pasted has error with "!" operand after lunchURL costant. Are you sure the code above is correct?

Nevertheless thank you for your attention!

Stephen Whitfield
Stephen Whitfield
16,771 Points

Nope, it's not an error. The parameter in that class method for NSData is an optional and needs to be passed an unwrapped NSURL object. I'm very sure the code above is correct.

Dawid Cedrych
Dawid Cedrych
15,108 Points
Dawid Cedrych
Dawid Cedrych
15,108 Points

I believe it works, but I'm still having the problem with syntax. Here is a link to the project with corrected code ( it's really simple, it's just the view controller and one additional class with variables, almost identical to weather app).

https://github.com/thedc89/LTB

Could you take a look and checked if you are able to get this json, parse it and get it working?

Thank you!

Dawid Cedrych
Dawid Cedrych
15,108 Points
Dawid Cedrych
Dawid Cedrych
15,108 Points

Slight modification: 

let lunchURL:NSURL?

let dataObject:NSData?

Now works perfectly ;)