Question

我在解析json时试图从本地服务器获取一些数据。在视图控制器中，我访问本地Ruby on Rails服务器：

override func viewDidLoad() {
    super.viewDidLoad()

    var url = NSURL(scheme: "http", host: "0.0.0.0:3000", path: "/api/search?query=auto")
    var request = NSURLRequest(URL: url)

    let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {(data, response, error) in
    var data1: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
        println(data1)
        println(data1["companies"])
        var companies = data1["companies"] as NSArray
        for company: AnyObject in companies {
            println(company)
        }
    }
    task.resume()
}

println(data1)返回：

{
    companies = "[{\"alias\":\"02-avtomoyka-tulybaev-r-t\",\"id\":45693},{\"alias\":\"1001-zapchast-internetmagazin-avtotovarov\",\"id\":42621}]";
}

使用println(data1["companies"])，我在控制台中获得了一系列对象：

[{"alias":"02-avtomoyka-tulybaev-r-t","id":45693},{"alias":"1001-zapchast-internetmagazin-avtotovarov","id":42621}]

然后，当我试图遍历该数组时，应用程序崩溃了。我究竟做错了什么？它在控制台中没有任何错误，但在Tread 6中(lldb)和EXC_BREAKPOINT(code=EXC_I386_BPT, subcode 0x0)

PS：Xcode也会在Constant 'company' inferred to have type 'AnyObject', which may be unexpected字符串处抛出编译器问题for company in companies {。我怎么处理呢？

Answer 1

而不是var companies = data1["companies"] as NSArray尝试var companies = data1["companies"].allValues;

问题是data1["companies"]是字典，无法隐式转换为NSArray。编译器没有抓住这个，因为data1["companies"]作为NSDictionary存储在AnyObject中，并允许您将其强制转换为任何子类。

无法遍历数组

1 个答案: