从MySQL中检索数据并显示它

Question

我在处理私人项目时遇到了问题。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到数据库中，然后将其解析为PHP，并在最终阶段在我创建的iOS应用程序上显示它。

我浏览了很多互联网上的教程，关于如何从php文件中检索数据并将其显示在tableView中，这是我遇到的第一个问题。我不打算使用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： 我跟着一个教程，并使它适用于tableView，但是当我试图自定义输出时，我无法做到正确。

我得到的信息被保存到字典中，但是当我尝试以任何方式使用字典时，我得到一个断点，仿真停止。

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) 
      }) 
     } 
    } 

它是未在断点出现的类HomeModel的方法/函数parseJSON 。这是破坏代码的let location = LocationModel()。我试图通过调试的详细信息，搜索并一直在使用的螺纹婆$ arg0都试图找到更多的，但我只能得到错误信息Errored out in Execute, couldn't PrepareToExecuteJITExpression

我得到了jsonResult NSMutableArray里充满了信息和jsonElement为好吧，但之后就会中断。

我真的很感谢在这件事情上的一些帮助，因为我很快就因为这个问题而头发不整。如果您发现解决方案不好或需要更多信息，请直接询问。

Answer 1

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

从parseJSON

var jsonResult: NSMutableArray = NSMutableArray() 

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

要发挥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) 
      } 
     }