//Patient class
import Foundation
struct Patients {
var family: NSArray
var given: NSArray
var id: String
var birthdate:String
var gender: String
}
struct Address {
var city: String
var country: String
var line: NSArray
}
class Patient {
var flag = 0
var address = Address(city: "", country: "", line: [""])
var patient_info = Patients(family: [""], given: [""], id: "", birthdate: "", gender: "")
var response : AnyObject?
init(response: AnyObject) {
self.response = response
if let entry = response.objectForKey("entry") {
//MARK: Address
if let resource = entry[0].objectForKey("resource") {
if let add = resource.objectForKey("address") {
address.city = add[0].objectForKey("city")! as! String
address.country = add[0].objectForKey("country")! as! String
address.line = add[0].objectForKey("line")! as! NSArray
//MARK: patient
patient_info.birthdate = resource.objectForKey("birthDate")! as! String
patient_info.gender = resource.objectForKey("gender")! as! String
if let name = resource.objectForKey("name") {
patient_info.family = name[0].objectForKey("family")! as! NSArray
patient_info.given = name[0].objectForKey("given")! as! NSArray
}
}
}
//MARK: id
if let link = entry[0].objectForKey("link") {
if let url = link[0].objectForKey("url") {
let id = url.componentsSeparatedByString("/")
patient_info.id = id[id.count-1]
}
}
}
print(patient_info)
}
}
//ViewController class
import UIKit
class ViewController: UIViewController, UITextFieldDelegate {
var viewModel = ViewModel()
@IBOutlet weak var family_name: UITextField!
@IBOutlet weak var given_name: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
family_name.delegate = self
given_name.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func textFieldShouldReturn(textField: UITextField) -> Bool {
switch textField {
case family_name:
family_name.resignFirstResponder()
given_name.becomeFirstResponder()
case given_name:
given_name .resignFirstResponder()
default:
print("")
}
return true
}
@IBAction func search(sender: UIButton) {
let family_name1 = family_name.text!
let given_name1 = given_name.text!
viewModel .searchForPatient(family_name1, given_name: given_name1)
//When the name property from my patient class changed I can call the //below method. How to implement the observer?
performSegueWithIdentifier("showSegue", sender:sender)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender:AnyObject?){
if segue.identifier == "showPatientSegue" {
if let displayViewController = segue.destinationViewController as? DisplayViewController {
displayViewController.viewModelDisplay.patient = viewModel.patient
}
}
}
}
// ViewModel where I make the request.
import Foundation
import Alamofire
import SystemConfiguration
class ViewModel {
var patient = Patient!()
func searchForPatient(family_name: String, given_name : String) {
let header = ["Accept" : "application/json"]
Alamofire.request(.GET, "https://open-ic.epic.com/FHIR/api/FHIR/DSTU2/Patient?family=\(family_name)&given=\(given_name)", headers: header).responseJSON { response in
self.patient = Patient(response: response.result.value!)
}
}
func checkInternetConnection() -> Bool {
var zeroAddress = sockaddr_in()
zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
zeroAddress.sin_family = sa_family_t(AF_INET)
let defaultRouteReachability = withUnsafePointer(&zeroAddress) {
SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))
}
var flags = SCNetworkReachabilityFlags()
if !SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) {
return false
}
let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0
let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequired)) != 0
return (isReachable && !needsConnection)
}
}
问题是 View 加载速度比请求更快，我需要观察 Patient 类中的属性何时更改，以便可以加载 View 。如果 View 加载速度快于请求，我将无法显示我需要的患者信息。
最佳答案
你有很多选择:
将委托(delegate)(弱!)对象存储到 ViewController，以便当您的患者完成时，您可以加载 View 。同时，在 View 中显示一些有意义的内容。
发送一个 NSNotification，ViewController 是它的监听器。
KVO(其解释 here ，只需搜索“键值观察”)，这需要您的 Patient 对象扩展 NSObject，以便您可以利用 objc 的 KVO。
希望有帮助!
关于swift - 我想观察值何时更改并加载 View ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34806967/