ios - 无法遍历数组

Question

我试图在解析 json 时从本地服务器获取一些数据。在 View Controller 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"])，我在控制台中得到了对象数组:

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

然后，当我尝试迭代该数组时，应用程序崩溃了。我究竟做错了什么？ 控制台中没有错误，但 Tread 6 中出现 (lldb) 和 EXC_BREAKPOINT(code=EXC_I386_BPT, subcode 0x0)

PS:Xcode 还抛出了编译器问题 Constant 'company' inferred to have type 'AnyObject', which may be unexpected at for company in companys { string.我该如何处理？

Answer 1

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

问题是 data1["companies"] 是一个字典，不能隐式转换为 NSArray。编译器没有捕捉到这一点，因为 data1["companies"] 作为 AnyObject 存储在 NSDictionary 中，并且允许您将其转换为任何子类。