JSON Parsing and recieved : fatal error: unexpectedly found nil while unwrapping an Optional value

Question

override func viewDidLoad() {
    super.viewDidLoad()
    let reposURL = NSURL(string: "https://maps.googleapis.com/maps/api/place/nearbysearch/json?key=AIzaSyC4BR5rZLNkeGChLr8N00BHZqBYqPdrgjg&location=43.690578,-79.342348&radius=400&types=cafe|bakery")
    // 2
    if let JSONData = NSData(contentsOfURL: reposURL!) {
        // 3
        if let json = NSJSONSerialization.JSONObjectWithData(JSONData, options: nil, error: nil) as? NSDictionary {
            // 4
            if let reposArray = json["items"] as? [NSDictionary] {
                // 5
                for item in reposArray {
                    repositories.append(Repository(json: item))
                }
            }
        }
    }
}

在第 5 行收到 exc_bad_instruction 错误，不知道为什么，它说我强制展开 nil 但 URL 正在工作，我可以在我的浏览器中毫无问题地打开它并查看所有内容JSON 数据

Answer 1

用 NSUTF8StringEncoding 编码你的 URL :

var urlstr = "https://maps.googleapis.com/maps/api/place/nearbysearch/json?key=AIzaSyC4BR5rZLNkeGChLr8N00BHZqBYqPdrgjg&location=43.690578,-79.342348&radius=400&types=cafe|bakery"

var escapedString = urlstr.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)

let reposURL = NSURL(string: escapedString!)
// 2
if let JSONData = NSData(contentsOfURL: reposURL!) {
    // 3
    if let json = NSJSONSerialization.JSONObjectWithData(JSONData, options: nil, error: nil) as? NSDictionary {
        // 4
        print(json)
        if let reposArray = json["results"] as? [NSDictionary] {
            // 5
            for item in reposArray {
                print(item)// You will get particular items 
            }
        }
    }
}

然后您将收到 JSON 回复。

响应中没有 items.

这样的参数

因此，在 print(json) 之后检查响应并通过参数获取数据。

希望对您有所帮助。

Answer 2

与 Swift 2 NSJSONSerialization 的签名已更改，以符合新的错误处理系统。这是与@ashish-kakkad 提出的相同答案，但已更新为 Swift 2

    var urlstr = "https://maps.googleapis.com/maps/api/place/nearbysearch/json?key=AIzaSyC4BR5rZLNkeGChLr8N00BHZqBYqPdrgjg&location=43.690578,-79.342348&radius=400&types=cafe|bakery"

        var escapedString = urlstr.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)

        let reposURL = NSURL(string: escapedString!)
        // 2
        if let JSONData = NSData(contentsOfURL: reposURL!) {
            // 3
                do {
                    if let json = try NSJSONSerialization.JSONObjectWithData(JSONData, options: []) as? NSDictionary {
                        // 4
                        print(json)
                        if let reposArray = json["results"] as? [NSDictionary] {
                            // 5
                            for item in reposArray {
                                print(item)// You will get particular items
                            }
                        }
                    }
                } catch let error as NSError {
                    print(error.localizedDescription)
                }
        }

JSON Parsing and recieved : fatal error: unexpectedly found nil while unwrapping an Optional value

JSON Parsing and recieved : fatal error: unexpectedly found nil while unwrapping an Optional value

null

parsing

json

fatal-error

ios