任何人都可以帮助我使用这个快速的代码，我是一个快速的初学者。 我试图使用MVC创建一个登录页面，它看起来像enter image description here
所以当用户输入他们的登录信息时，JSON数据的状态是＆＃34; s＆＃34;为了成功登录，它应该显示一些测试信息，当登录状态是＆＃34; f＆＃34;如果登录失败，它应该保留在同一个登录页面中，我试图访问下面代码中协议方法中的状态：
因此，每当用户按下按钮时，它应该采取所需的操作，但下面代码中的状态为nil，因此每当我运行应用程序时，信息会在登录成功或不成功时显示
//this piece of code is in the LoginViewController
func didReceivedLoginInfo(info : [LoginModel]) -> String
{
self.loginData = info
print("didReceivedLOOGIN count is \(loginData!.count)")//the print is successful here
for i in 0..<loginData!.count
{
print("LoginData Info : \(loginData![i])")//the print is successful here
}
statuss = loginData![0].status
print("HERE YOU GO, THIS IS WHAT I FOUND: \(statuss!)")//the print is successful here
return statuss!
}
//this piece of code is in the LoginViewController
func buttonAction(sender:UIButton!)
{
var btnsendtag: UIButton = sender
var uName = username!.text as? String!
var uPass = password!.text as? String!
parser = LoginParser()
parser!.getLoginInfo(uName!, pass: uPass!)
var status = loginData?[0].status
print("from View Controller this is the msg: \(status)")
parser!.delegate = self
if status == "s" {
print("from View Controller this is the status: \(status)")
let vc = ViewController()
let navigationController = UINavigationController(rootViewController: vc)
self.presentViewController(navigationController, animated: true, completion: nil)
}
else {
let vc = LoginViewController()
let navigationController = UINavigationController(rootViewController: vc)
self.presentViewController(navigationController, animated: true, completion: nil)
}
}
////this piece of code is in the LoginParser
import UIKit
@objc protocol LoginParserDelegate : NSObjectProtocol
{
func didReceivedLoginInfo (info : [LoginModel]) -> String
optional func didRecivedError()
}
class LoginParser: NSObject {
// var webData: NSMutableData?
var webData: NSData?
weak var delegate : LoginParserDelegate?
var name = String ()
var model : LoginModel?
var alertView:UIAlertView?
var MainLogin : [LoginModel] = []
func getLoginInfo (usern : String, pass : String){
var post:NSString = "LID=\(usern)&PWD=\(pass)&Passcode=s@v#"
var url:NSURL = NSURL(string: "some link")!
var postData:NSData = post.dataUsingEncoding(NSUTF8StringEncoding)!
var postLength:NSString = String( postData.length )
var request:NSMutableURLRequest = NSMutableURLRequest(URL: url)
request.HTTPMethod = "POST"
request.HTTPBody = postData
request.setValue(postLength as String, forHTTPHeaderField: "Content-Length")
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.setValue("application/json", forHTTPHeaderField: "Accept")
var response: NSURLResponse?
let connection = NSURLConnection(request: request, delegate: self)
}
func connection(connection: NSURLConnection, didFailWithError error: NSError){
if delegate != nil {
if delegate!.respondsToSelector(Selector("didRecivedLoginInfo")){
delegate!.didRecivedError!()
}
}
}
func connection(connection: NSURLConnection, didReceiveResponse response: NSURLResponse){
webData = NSData()
}
func connection(connection: NSURLConnection, didReceiveData data: NSData){
webData! = data
}
func connectionDidFinishLoading(connection: NSURLConnection){
let responseString = NSString(data: webData!, encoding: NSUTF8StringEncoding)
print("responseString \(responseString!)")
processUserTypes ()
}
func processUserTypes ()->[LoginModel]
{
model = LoginModel()
// Process JSON
do {
let result = try NSJSONSerialization.JSONObjectWithData(webData!, options: NSJSONReadingOptions.MutableContainers)as? NSDictionary
var Login = LoginModel()
let status = result?.objectForKey("Status") as? String
let msg = result?.objectForKey("En") as? String
let employeename=result?.objectForKey("DisplayName")as? String
print("STATUS IN PARSER IS \(status!)")
if status == "s"
{
print(status!)
Login.name = employeename
Login.status = status
Login.message = msg
alertView = UIAlertView()
alertView!.title = "Login successful"
alertView!.message = "Welcome \(employeename!)"
alertView!.delegate = self
alertView!.addButtonWithTitle("OK")
alertView!.show()
MainLogin.append(Login)
print("count in login is \(MainLogin.count)")
if delegate != nil
{
delegate!.didReceivedLoginInfo(MainLogin)
}
}
else
{
Login.message = msg
alertView = UIAlertView()
alertView!.title = "Login failed"
alertView!.message = msg!
alertView!.delegate = self
alertView!.addButtonWithTitle("OK")
alertView!.show()
MainLogin.append(Login)
print("this is the main login\(MainLogin)")
}
}
catch {
if delegate != nil {
if delegate!.respondsToSelector(Selector("didRecivedLoginInfo")){
delegate!.didRecivedError!()
}
}
}
return MainLogin
}
}
任何人都可以帮我这个吗？ 感谢
答案 0 :(得分：0)
您在didReceivedLoginInfo内拨打processUserTypes，connectionDidFinishLoading在buttonAction内调用。 getLoginInfo调用connectionDidFinishLoading执行异步请求，该请求将在完成后回拨getLoginInfo。
此connectionDidFinishLoading会在请求发出之前返回很长时间，并且会收到一个响应并且会调用dispatch_async(dispatch_get_main_queue()){
//here
}
。
=＆GT;调用getLogininfo
后，你无法做任何事情=＆GT;
按钮方法
表示didReceiveLoginInfo。
你可以做进一步的逻辑，甚至是ui那里的东西（你必须包装影响ui的逻辑
import UIKit
class ProfileCreator: UIViewController, UIPickerViewDelegate, UITextFieldDelegate, UIPickerViewDataSource {
var output: Int = 0
var output2: Int = 0
// -------------------------------------------------------------------------------------- //
// DOB Selector From Text Field Start 1 //
@IBOutlet weak var DOBSelectorTextField: UITextField!
func textFieldDidBeginEditing(textField: UITextField) {
let datepicker = UIDatePicker()
textField.inputView = datepicker
datepicker.datePickerMode = UIDatePickerMode.Date
datepicker.addTarget(self, action: "datepickerchanged:", forControlEvents: .ValueChanged)
}
func textFieldShouldReturn(textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
func datepickerchanged(sender: UIDatePicker) {
let formatter = NSDateFormatter()
formatter.dateFormat = "dd MMMM yyyy"
DOBSelectorTextField.text = formatter.stringFromDate(sender.date)
}
// DOB Selector From Text Field End 1 //
// -------------------------------------------------------------------------------------- //
// Gender Selector From Text Field Start 1 //
@IBOutlet weak var GenderSelectorTextField: UITextField!
var GenderSelectorData = ["Male", "Female"]
var GenderSelectorPicker = UIPickerView()
// Gender Selector From Text Field End 1 //
// -------------------------------------------------------------------------------------- //
// Height Whole Number Text Field Start 1 //
@IBOutlet weak var HeightWholeNumberTextField: UITextField!
// Height Whole Number Text Field Start 1 //
// -------------------------------------------------------------------------------------- //
// Height Whole Number Unit Selector Text Field Start 1 //
@IBOutlet weak var HeightWholeNumberUnitSelectorTextField: UITextField!
var HeightWholeNumberUnitSelectorData = ["m", "ft"]
var HeightWholeNumberUnitSelectorPicker = UIPickerView()
// Height Whole Number Unit Selector Text Field Start 1 //
// -------------------------------------------------------------------------------------- //
// Height Decimal Number Text Field Start 1 //
@IBOutlet weak var HeightDecimalTextField: UITextField!
// Height Decimal Number Text Field End 1 //
// -------------------------------------------------------------------------------------- //
// Height Decimal Number Unit Selector Text Field Start 1 //
@IBOutlet weak var HeightDecimalNumberUnitSelectorTextField: UITextField!
var HeightDecimalNumberUnitSelectorData = ["cm", "inch"]
var HeightDecimalNumberUnitSelectorPicker = UIPickerView()
// Height Decimal Number Unit Selector Text Field End 1 //
// -------------------------------------------------------------------------------------- //
// Current Weight Whole Number Text Field Start 1 //
@IBOutlet weak var CurrentWeightWholeNumberTextField: UITextField!
// Current Weight Whole Number Text Field Start 1 //
// -------------------------------------------------------------------------------------- //
// Current Weight Whole Number Unit Selector Text Field Start 1 //
@IBOutlet weak var CurrentWeightWholeNumberUnitSelectorTextField: UITextField!
var CurrentWeightWholeNumberUnitSelectorData = ["kg", "lb"]
var CurrentWeightWholeNumberUnitSelectorPicker = UIPickerView()
// Current Weight Whole Number Unit Selector Text Field Start 1 //
// -------------------------------------------------------------------------------------- //
// Current Weight Decimal Number Text Field Start 1 //
@IBOutlet weak var CurrentWeightDecimalNumberTextField: UITextField!
// Current Weight Decimal Number Text Field End 1 //
// -------------------------------------------------------------------------------------- //
// Current Weight Decimal Number Unit Selector Text Field Start 1 //
@IBOutlet weak var CurrentWeightDecimalNumberUnitSelectorTextField: UITextField!
var CurrentWeightDecimalNumberUnitSelectorData = ["g", "oz"]
var CurrentWeightDecimalNumberUnitSelectorPicker = UIPickerView()
// Current Weight Decimal Number Unit Selector Text Field End 1 //
// -------------------------------------------------------------------------------------- //
// Current Fitness Goal Selector Text Field Start 1 //
@IBOutlet weak var CurrentFitnessGoalSelectorTextField: UITextField!
var CurrentFitnessGoalSelectorData = ["Lose Fat", "Gain Muscle", "Maintain Physique"]
var CurrentFitnessGoalSelectorPicker = UIPickerView()
// Current Fitness Goal Selector Text Field End 1 //
// -------------------------------------------------------------------------------------- //
// Weekly Activity Level Text Field Start 1 //
@IBOutlet weak var WeeklyActivityLevelTextField: UITextField!
var WeeklyActivityLevelTextFieldData = ["I am sedentary (little or no exercise)", "I am lightly active (light exercise/sports 1-3 days per week)", "I am moderately active (moderate exercise/sports 3-5 days per week)", "I am very active (hard exercise/sports 6-7 days a week)", "I am extra active (very hard exercise/sports & physical job or 2 x training"]
var WeeklyActivityLevelSelectorPicker = UIPickerView()
// Weekly Activity Level Text Field End 1 //
// Close keyboard start //
func closekeyboard() {
self.view.endEditing(true)
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
closekeyboard()
}
// Close keyboard end //
// -------------------------------------------------------------------------------------- //
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
// -------------------------------------------------------------------------------------- //
// DOB Selector From Text Field Start 2 //
DOBSelectorTextField.delegate = self
// DOB Selector From Text Field End 2 //
// -------------------------------------------------------------------------------------- //
// Gender Selector From Text Field Start 2 //
GenderSelectorPicker.delegate = self
GenderSelectorPicker.dataSource = self
GenderSelectorTextField.inputView = GenderSelectorPicker
// Gender Selector From Text Field End 2 //
// -------------------------------------------------------------------------------------- //
// Height Whole Number Unit Selector Text Field Start 2 //
HeightWholeNumberUnitSelectorPicker.delegate = self
HeightWholeNumberUnitSelectorPicker.dataSource = self
HeightWholeNumberUnitSelectorTextField.inputView = HeightWholeNumberUnitSelectorPicker
// Height Whole Number Unit Selector Text Field End 2 //
// -------------------------------------------------------------------------------------- //
// Height Decimal Unit Selector Text Field Start 2 //
HeightDecimalNumberUnitSelectorPicker.delegate = self
HeightDecimalNumberUnitSelectorPicker.dataSource = self
HeightDecimalNumberUnitSelectorTextField.inputView = HeightDecimalNumberUnitSelectorPicker
// Height Decimal Unit Selector Text Field End 2 //
// -------------------------------------------------------------------------------------- //
// Current Weight Whole Number Unit Selector Text Field Start 2 //
CurrentWeightWholeNumberUnitSelectorPicker.delegate = self
CurrentWeightWholeNumberUnitSelectorPicker.dataSource = self
CurrentWeightWholeNumberUnitSelectorTextField.inputView = CurrentWeightWholeNumberUnitSelectorPicker
// Current Weight Whole Number Unit Selector Text Field End 2 //
// -------------------------------------------------------------------------------------- //
// Current Weight Decimal Unit Selector Text Field Start 2 //
CurrentWeightDecimalNumberUnitSelectorPicker.delegate = self
CurrentWeightDecimalNumberUnitSelectorPicker.dataSource = self
CurrentWeightDecimalNumberUnitSelectorTextField.inputView = CurrentWeightDecimalNumberUnitSelectorPicker
// Current Weight Decimal Unit Selector Text Field End 2 //
// -------------------------------------------------------------------------------------- //
// Current Fitness Goal Selector Text Field Start 2 //
CurrentFitnessGoalSelectorPicker.delegate = self
CurrentFitnessGoalSelectorPicker.dataSource = self
CurrentFitnessGoalSelectorTextField.inputView = CurrentFitnessGoalSelectorPicker
// Current Fitness Goal Selector Text Field End 2 //
// -------------------------------------------------------------------------------------- //
// Weekly Activity Level Selector Text Field Start 2 //
WeeklyActivityLevelSelectorPicker.delegate = self
WeeklyActivityLevelSelectorPicker.dataSource = self
WeeklyActivityLevelTextField.inputView = WeeklyActivityLevelSelectorPicker
// Weekly Activity Level Selector Text Field End 2 //
// -------------------------------------------------------------------------------------- //
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// -------------------------------------------------------------------------------------- //
// Selectors Start 1 //
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if pickerView == GenderSelectorPicker {
output = 1
} else if pickerView == HeightWholeNumberUnitSelectorPicker {
output = 2
} else if pickerView == HeightDecimalNumberUnitSelectorPicker {
output = 3
} else if pickerView == CurrentWeightWholeNumberUnitSelectorPicker {
output = 4
} else if pickerView == CurrentWeightDecimalNumberUnitSelectorPicker {
output = 5
} else if pickerView == CurrentFitnessGoalSelectorPicker { output = 6
} else if pickerView == WeeklyActivityLevelSelectorPicker {
output = 7
}
switch output{
case 1:
return GenderSelectorData.count
case 2:
return HeightWholeNumberUnitSelectorData.count
case 3:
return HeightDecimalNumberUnitSelectorData.count
case 4:
return CurrentWeightWholeNumberUnitSelectorData.count
case 5:
return CurrentWeightDecimalNumberUnitSelectorData.count
case 6:
return CurrentFitnessGoalSelectorData.count
case 7:
return WeeklyActivityLevelTextFieldData.count
default:
return 1
}
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if pickerView == GenderSelectorPicker {
output2 = 1
} else if pickerView == HeightWholeNumberUnitSelectorPicker {
output2 = 2
} else if pickerView == HeightDecimalNumberUnitSelectorPicker {
output2 = 3
} else if pickerView == CurrentWeightWholeNumberUnitSelectorPicker {
output2 = 4
} else if pickerView == CurrentWeightDecimalNumberUnitSelectorPicker {
output2 = 5
} else if pickerView == CurrentFitnessGoalSelectorPicker {
output2 = 6
} else if pickerView == WeeklyActivityLevelSelectorPicker {
output2 = 7
}
switch output2{
case 1:
return GenderSelectorData[row]
case 2:
return HeightWholeNumberUnitSelectorData[row]
case 3:
return HeightDecimalNumberUnitSelectorData[row]
case 4:
return CurrentWeightWholeNumberUnitSelectorData[row]
case 5:
return CurrentWeightDecimalNumberUnitSelectorData[row]
case 6:
return CurrentFitnessGoalSelectorData[row]
case 7:
return WeeklyActivityLevelTextFieldData[row]
default:
return ""
}
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent comonent: Int) {
if pickerView == GenderSelectorPicker {
GenderSelectorTextField.text = GenderSelectorData[row]
} else if pickerView == HeightWholeNumberUnitSelectorPicker {
HeightWholeNumberUnitSelectorTextField.text = HeightWholeNumberUnitSelectorData[row]
} else if pickerView == HeightDecimalNumberUnitSelectorPicker {
HeightDecimalNumberUnitSelectorTextField.text = HeightDecimalNumberUnitSelectorData[row]
} else if pickerView == CurrentWeightWholeNumberUnitSelectorPicker {
CurrentWeightWholeNumberUnitSelectorTextField.text = CurrentWeightWholeNumberUnitSelectorData[row]
} else if pickerView == CurrentWeightDecimalNumberUnitSelectorPicker {
CurrentWeightDecimalNumberUnitSelectorTextField.text = CurrentWeightDecimalNumberUnitSelectorData[row]
} else if pickerView == CurrentFitnessGoalSelectorPicker {
CurrentFitnessGoalSelectorTextField.text = CurrentFitnessGoalSelectorData[row]
} else if pickerView == WeeklyActivityLevelSelectorPicker {
WeeklyActivityLevelTextField.text = WeeklyActivityLevelTextFieldData[row]
}
}
}
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