从 MySQL 检索数据并显示它

Question

我在处理我的私人项目时遇到了一个问题。我刚刚通过购买虚拟专用服务器 (VPS) 改善了我的环境。我安装了 Apache、MySQL 和 PHP，以便能够将数据保存在数据库中，然后将其解析为 PHP，最后在我正在创建的 iOS 应用程序上显示它。

我浏览了互联网上关于如何从 php 文件中检索数据并将其显示在 tableView 中的相当多的教程，这是我遇到的第一个问题。我不会使用 tableView，出于某种原因，我一直在努力将数据放入字典/数组中而没有任何问题。

问题： 我遵循了一个教程并使其适用于 tableView 但是当我尝试自定义输出时，我无法做到正确。

我得到了保存到字典中的信息，但是当我尝试以任何方式使用字典时，我得到一个断点，模拟就停止了。

代码：

类 - LocationModel.swift

import Foundation
class LocationModel: NSObject {
    var id: String?
    var name: String?
    var address: String?
    var city: String?
    var country: String?
    var typ: String?
    var lastresult: String?

    override init() {

    }

    init(id: String, name: String, address: String, city: String, country: String, typ: String, lastresult: String) {
        self.id = id
        self.name = name
        self.address = address
        self.city = city
        self.country = country
        self.typ = typ
        self.lastresult = lastresult

    }

    override var description: String {
        return "Name: \(name), Address: \(address)"
    }
}

类 - HomeModel.swift

import Foundation

protocol HomeModelProtocal: class {
    func itemsDownloaded(items: NSArray)
}

    class HomeModel: NSObject, NSURLSessionDataDelegate {

        weak var delegate: HomeModelProtocal!

        var data : NSMutableData = NSMutableData()

        let urlPath: String = "http://server.truesight.se/risSwiftPHP/phptest.php"

        func downloadItems() {

            let url: NSURL = NSURL(string: urlPath)!
            var session: NSURLSession!
            let configuration = NSURLSessionConfiguration.defaultSessionConfiguration()

            session = NSURLSession(configuration: configuration, delegate: self, delegateQueue: nil)

            let task = session.dataTaskWithURL(url)

            task.resume()
        }

        func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveData data: NSData) {
            self.data.appendData(data)
        }

        func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError error: NSError?){
            if error != nil {
                print("Failed to download data")
            } else {
                print("Data downloaded")
                self.parseJSON()
            }
        }

        func parseJSON() {
            var jsonResult: NSMutableArray = NSMutableArray()

            do {
                jsonResult = try NSJSONSerialization.JSONObjectWithData(self.data, options:NSJSONReadingOptions.AllowFragments) as! NSMutableArray
            } catch let error as NSError {
                print(error)
            }

            var jsonElement: NSDictionary = NSDictionary()
            let locations: NSMutableArray = NSMutableArray()

            for item in jsonResult {
                jsonElement = item as! NSDictionary

                let location = LocationModel()

                if let id = jsonElement["id"] as? String,
                    let name = jsonElement["name"] as? String,
                    let address = jsonElement["address"] as? String,
                    let city = jsonElement["city"] as? String,
                    let country = jsonElement["country"] as? String,
                    let typ = jsonElement["typ"] as? String,
                    let lastresult = jsonElement["lastresult"] as? String
                {
                    print(id + name + address + country + city + typ + lastresult)
                    location.id = id
                    location.name = name
                    location.address = address
                    location.city = city
                    location.country = country
                    location.typ = typ
                    location.lastresult = lastresult
                }


                if let name = jsonElement["name"] as? String,
                    let address = jsonElement["address"] as? String
                {
                    location.name = name
                    location.address = address
                }

                locations.addObject(location)
            }

            dispatch_async(dispatch_get_main_queue(), {() -> Void in

                self.delegate.itemsDownloaded(locations)
            })
        }
    }

断点出现在 HomeModel 类中的方法/函数 parseJSON。破坏代码的是let location = LocationModel()。我尝试在调试中搜索更多信息，并在线程上使用 po $arg0 来尝试查找更多信息，但我只收到错误消息Errored out in Execute, couldn't PrepareToExecuteJITExpression

我确实得到了充满信息的jsonResult NSMutableArray 和jsonElement，但之后它就坏了。

我真的很感激能在这件事上得到一些帮助，因为我很快就会因为这个问题而脱发。如果您发现解决方案不好或想了解更多信息，请询问。

Answer 1

我觉得我已经解决了它，但我不确定它是否是最终的解决方案。我将以下部分从 parserJSON 移动到 URLSession。

来自 parseJSON

var jsonResult: NSMutableArray = NSMutableArray()

            do {
                jsonResult = try NSJSONSerialization.JSONObjectWithData(self.data, options:NSJSONReadingOptions.AllowFragments) as! NSMutableArray
            } catch let error as NSError {
                print(error)
            }

功能 URLSession

 func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError error: NSError?){
                if error != nil {
                    print("Failed to download data")
                } else {
                    print("Data downloaded")
                    var jsonResult: NSMutableArray = NSMutableArray()
                do {
                    jsonResult = try NSJSONSerialization.JSONObjectWithData(self.data, options:NSJSONReadingOptions.AllowFragments) as! NSMutableArray
                } catch let error as NSError {
                    print(error)
                }
                // Array is jsonResult, 
                // I sent it to my ViewController to control the output. 
                print(jsonResult)
                var VC = ViewController()
                VC.SomeMethod(jsonResult)
            }
        }