如何快速制作密码确认器 3

Question

我有4个文本字段，其中2个是密码和确认密码。在进入登录屏幕之前，我需要检查它们是否相同或其中包含文本。这是我的代码：

func registerButtonTapped() {
    var a = false
    var b = false

    if passwordFieldR.text! == confirmFieldR.text! {
        a = true
    } else {
        nonMatchingPasswords.text = "Passwords Do Not Match"
    }

    if(passwordFieldR.text! == "" || confirmFieldR.text! == "") {
        nonMatchingPasswords.text = "Password Field is empty"
    } else {
        b = true    
    }

    if a == true && b == true {
        func registerButtonTwo(_ sender: Any) {
            self.performSegue(withIdentifier: "registertologin", sender: self)
        }
    }
}

应用程序崩溃并在控制台中向我显示以下错误消息：

2017-06-19 21:29:20.926579+1200 Altitude[1655:588172] [MC] System group container for systemgroup.com.apple.configurationprofiles path is /private/var/containers/Shared/SystemGroup/systemgroup.com.apple.configurationprofiles
2017-06-19 21:29:20.927965+1200 Altitude[1655:588172] [MC] Reading from public effective user settings.
2017-06-19 21:29:30.784007+1200 Altitude[1655:588172] -[Altitude.secondscreenviewcontroller registerButtonTwo:]: unrecognized selector sent to instance 0x100d085d0
2017-06-19 21:29:30.784671+1200 Altitude[1655:588172] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Altitude.secondscreenviewcontroller registerButtonTwo:]: unrecognized selector sent to instance 0x100d085d0'
*** First throw call stack:
(0x18add2fd8 0x189834538 0x18add9ef4 0x18add6f4c 0x18acd2d2c 0x190f370ec 0x190f3706c 0x190f215e0 0x190f36950 0x190f3646c 0x190f31804 0x190f02418 0x1916fbf64 0x1916f66c0 0x1916f6aec 0x18ad81424 0x18ad80d94 0x18ad7e9a0 0x18acaed94 0x18c718074 0x190f67130 0x1000e075c 0x189cbd59c)
libc++abi.dylib: terminating with uncaught exception of type NSException

发生了什么事以及如何解决这个问题？

Answer 1

我认为这对你有用（你可以将5个数字更改为任何你想要的密码字符的最少数字）

if  ((passwordFieldR.text?.characters.count)! > 5) {


 if passwordFieldR.text! == confirmFieldR.text! {


    print("registertologin")

 } else {

   print("Password Does Not Match Confirm Password")


 }

 } else {

  print("password Characters should be more Than 5")

  }

Answer 2

发生错误是因为目标/操作方法必须在类的顶层声明。

你可能是说

func registerButtonTapped() {

    var a = false
    var b = false

    if passwordFieldR.text! == confirmFieldR.text! {
        a = true
    } else {
        nonMatchingPasswords.text = "Passwords Do Not Match"
    }

    if(passwordFieldR.text! == "" || confirmFieldR.text! == "") {
        nonMatchingPasswords.text = "Password Field is empty"
    } else {
        b = true
    }

    if a == true && b == true {
       registerButtonTwo(self)
    }
}

func registerButtonTwo(_ sender: Any) {
     self.performSegue(withIdentifier: "registertologin", sender: self)
}

PS：

registerButtonTapped()

可以写得更高效

func registerButtonTapped() {

    guard let password = passwordFieldR.text, !password.isEmpty,
        let confirm = confirmFieldR.text, !confirm.isEmpty else {
            nonMatchingPasswords.text = "Password Field is empty"
            return
    }
    guard password == confirm else {
        nonMatchingPasswords.text = "Passwords Do Not Match"
        return
    }
    registerButtonTwo(self)

}

Answer 3

您似乎有一个来自故事板的悬空连接，您从代码中删除了该连接，但忘记在故事板中这样做。右键单击视图（可能是

login

按钮）并检查是否存在死连接。

Answer 4

更换

func registerButtonTwo(_ sender: Any) {
            self.performSegue(withIdentifier: "registertologin", sender: self)
        }

仅

self.performSegue(withIdentifier: "registertologin", sender: self)

Answer 5

验证密码并确认密码

func isValidPassword(passworld: String, confirmPassworld: String) -> Bool{
    if confirmPassworld.lowercased() == passworld.lowercased(){
        return true
    }
    return false
}