NSData contentsOfURL constructor returns nil

问题

I'm trying to access an API I made in PHP. It works fine in browser, but I can't get this code to fetch any sort of data from any given webpage.

var jsonData: NSData = NSData(contentsOfURL: NSURL(string: "http://www.google.com"))
let string1 = NSString(data: jsonData, encoding: NSUTF8StringEncoding)
println(string1)

What am I doing wrong here?

Update: Here's the output after changing encoding.

Also, NSURLConnection doesn't start when I do that either. Might be a related issue.

回答1:

the code is correct but the data isn't in UTF it seems so it fails to make the NSString.

fails in swift & objC

for that server data is in NSISOLatin2StringEncoding

it differs based on the HTTP endpoint and normally UTF8 is fine

---

    var jsonData: NSData = NSData(contentsOfURL: NSURL(string: "https://www.google.com"))
    let string1 = NSString(data: jsonData, encoding: NSISOLatin1StringEncoding)
    println(string1)

shows the page's sourcecode

来源：https://stackoverflow.com/questions/25944730/nsdata-contentsofurl-constructor-returns-nil