I've been having a problem understanding what xcode wants from me when it gives me the "Extra argument 'error' in call" it keeps pointing to
if let feed = NSJSONSerialization.JSONObjectWithData(data, options: .MutableContainers, error: nil) as? NSDictionary,
I read somewhere that in swift 2 I should add do { but everytime I add it I just keep breaking more stuff. What's the correct syntax in swift 2?
This is the code:
override func viewDidLoad() {
super.viewDidLoad()
let request = NSURLRequest(URL: NSURL(string: feedURL)!)
NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) { response, data, error in
if let feed = NSJSONSerialization.JSONObjectWithData(data, options: .MutableContainers, error: nil) as? NSDictionary,
title = feed.valueForKeyPath("feed.entry.im:name.label") as? String,
artist = feed.valueForKeyPath("feed.entry.im:artist.label") as? String,
imageURLs = feed.valueForKeyPath("feed.entry.im:image") as? [NSDictionary] {
if let imageURL = imageURLs.last,
imageURLString = imageURL.valueForKeyPath("label") as? String {
self.loadImageFromURL(NSURL(string:imageURLString)!)
}
self.titleLabel.text = title
self.titleLabel.hidden = false
self.artistLabel.text = artist
self.artistLabel.hidden = false
}
}
}
Here is the new way of error handling in swift 2...
do {
if let feed = try NSJSONSerialization.JSONObjectWithData(data, options: .MutableContainers) as? NSDictionary {
// Success block...
}
} catch {
print(error)
}
在Swift 2
做到这一点的方法是
let feed = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers)
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