iam在加载时尝试将我的按钮从登录更改为登录，但如果出现错误密码的UI警报，则想要返回默认状态“登录”
isChecked = !isChecked
if isChecked {
sender.setTitle("login", for: .normal)
} else {
sender.setTitle("logging", for: .normal)
这是完整的代码，我把警报放在else语句中 但是添加断点仍然无法正常工作
import UIKit
import SwiftECP
import XCGLogger
class ViewController: UIViewController {
var isChecked = true
@IBOutlet var UsernameField: UITextField!
@IBOutlet var passwordField: UITextField!
@IBOutlet var login: UIButton!
var file1 = "file.txt"
override func viewDidLoad() {
super.viewDidLoad()
login.layer.cornerRadius = login.frame.height / 2
var img = UIImage(named: "1.jpg")
view.layer.contents = img?.cgImage
}
@IBAction func _Login(_ sender: UIButton) {
let isFirstNameValid = checker(textField:UsernameField)
let ispasswordValid = checker(textField:passwordField)
isChecked = !isChecked
if isChecked {
sender.setTitle("login", for: .normal)
} else {
sender.setTitle("logging", for: .normal)
}
print ("text field \(isFirstNameValid)")
if isFirstNameValid && ispasswordValid == true {
gotourl()
DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
let readf = self.readFromDocumentsFile(fileName:self.file1)
let sizefile = self.filesize(fileName:self.file1)
if sizefile == true{
self.performSegue(withIdentifier: "gotowelcome", sender: self)
}
else
{
let alert = UIAlertController(title: "Login error", message: "Wrong Username or password.", preferredStyle: UIAlertControllerStyle.alert)
// add an action (button)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.destructive, handler: { action in
self.login.setTitle("Login", for: .normal)
self.UsernameField.text=""
self.passwordField.text=""
}))
// show the alert
self.present(alert, animated: true, completion: nil)
}
print("Here is the size of file \(sizefile)")
// change 2 to desired number of seconds
// Your code with delay
}
}
else {
let alert1 = UIAlertController(title: "Login error", message: "Please enter your username and password", preferredStyle: UIAlertControllerStyle.alert)
// add an action (button)
alert1.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
self.present(alert1, animated: true, completion: nil)
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func gotourl(){
let username1: String = UsernameField.text!
let password1: String = passwordField.text!
let protectedURL = URL(
string: "https://itsapps.odu.edu/auth/getInfo.php"
)!
let logger = XCGLogger()
logger.setup(level: .debug)
ECPLogin(
protectedURL: protectedURL,
username: username1,
password: password1,
logger: logger
).start { event in
switch event {
case let .value( body) :
// If the request was successful, the protected resource will
// be available in 'body'. Make sure to implement a mechanism to
// detect authorization timeouts.
print("Response body: \(body)")
//this is the file. we will write to and read from it
let text = "\(body)" //just a text
self.writeToDocumentsFile(fileName:self.file1,value:text)
// The Shibboleth auth cookie is now stored in the sharedHTTPCookieStorage.
// Attach this cookie to subsequent requests to protected resources.
// You can access the cookie with the following code:
if let cookies = HTTPCookieStorage.shared.cookies {
let shibCookie = cookies.filter { (cookie: HTTPCookie) in
cookie.name.range(of: "shibsession") != nil
}[0]
print(shibCookie)
}
case let .failed(error):
// This is an AnyError that wraps the error thrown.
// This can help diagnose problems with your SP, your IdP, or even this library :)
switch error.cause {
case let ecpError as ECPError:
// Error with ECP
// User-friendly error message
print(ecpError.userMessage)
// Technical/debug error message
print(ecpError.description)
case let alamofireRACError as AlamofireRACError:
// Error with the networking layer
print(alamofireRACError.description)
default:
print("Unknown error!")
print(error)
}
default:
break
}
}
}
func filesize(fileName:String) -> Bool {
let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString
let path = documentsPath.appendingPathComponent(fileName)
let attributes = try! FileManager.default.attributesOfItem(atPath:path)
let fileSize = attributes[.size] as! NSNumber
if fileSize != 0 {
return true
}
else{
return false
}
}
func checker(textField: UITextField) -> Bool {
guard (!textField.text!.isEmpty) else {
return false
}
return true
}
func writeToDocumentsFile(fileName:String,value:String) {
let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString
let path = documentsPath.appendingPathComponent(fileName)
do{
try value.write(toFile: path, atomically: true, encoding: String.Encoding.utf8)
}catch{
}
}
func readFromDocumentsFile(fileName:String) -> String {
let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString
let path = documentsPath.appendingPathComponent(fileName)
let checkValidation = FileManager.default
var file:String
if checkValidation.fileExists(atPath: path) {
do{
try file = NSString(contentsOfFile: path, encoding: String.Encoding.utf8.rawValue) as String
print ("Here is what is in file \(file)")
}catch{
file = ""
}
} else {
file = ""
}
return file
}
}
}
在我的代码的另一部分
let alert = UIAlertController(title: "Login error", message: "Wrong Username or password.", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.destructive, handler: { action in
self.UsernameField.text=""
self.passwordField.text=""
sender.setTitle("login", for: .normal)
}))
但仍然无法正常工作？
答案 0 :(得分：0)
我认为发生这种情况是因为你失去了对按钮的引用，并且必须在弹出窗口出现时再次加载，或者出现像这样的时髦。
由于有两种状态，只有一个简单的解决方案是使按钮的默认文本为＆＃34; login＆＃34;当你想改变它时，不要在关闭时这样做，因为它是一个弱的出口。
答案 1 :(得分：0)
你有提示吗？添加
后，上面的代码对我有用 self.present(alert, animated: true, completion: nil)
完整代码：
@IBAction func loginFailedButtonTapped(_ sender: UIButton) {
let alert = UIAlertController(title: "Login error", message: "Wrong Username or password.", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.destructive, handler: { action in
self.usernameField.text=""
self.passwordField.text=""
print("foo")
sender.setTitle("login", for: .normal)
}))
self.present(alert, animated: true, completion: nil)
}
更新
It looks like the issue is there in the following lines:
let sizefile = self.filesize(fileName:self.file1)
if sizefile == true{
self.performSegue(withIdentifier: "gotowelcome", sender: self)
}
else
{
let alert = UIAlertController(title: "Login error", message: "Wrong Username or password.", preferredStyle: UIAlertControllerStyle.alert)
// add an action (button)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.destructive, handler: { action in
self.login.setTitle("Login", for: .normal)
self.UsernameField.text=""
self.passwordField.text=""
}))
如果我设置let sizefile = false //self.filesize(fileName:self.file1)
代码确实转到了其他地方，警报按要求运行。
警报控制器没有问题，似乎func filesize(fileName:String)总是返回true，因此它永远不会进入其他条件。你需要修复这个功能。