ios – 设置TouchID“输入密码”后备以开始编辑UITextField

概述我在我的应用程序中设置了touchID并正常工作. 但是,我想更改“输入密码”的功能. 创建我的身份验证时,我遵循以下教程：http://www.appcoda.com/touch-id-api-ios8/ 但是,他们使用alertView作为“输入密码”选项. 我想解雇touchID alertview并让我的passwordTextField成为第一个响应者. 当然我试过了： self.pas 我在我的应用程序中设置了touchID并正常工作.

但是,我想更改“输入密码”的功能.

创建我的身份验证时,我遵循以下教程：http://www.appcoda.com/touch-id-api-ios8/

但是,他们使用alertVIEw作为“输入密码”选项.

我想解雇touchID alertvIEw并让我的passwordTextFIEld成为第一个响应者.

当然我试过了：

self.passwordTextFIEld.becomeFirstResponder()

但这会导致错误：

2015-04-09 10:48:42.309 Formula Stocks[3933:964941] *** Assertion failure in voID _UIPerformResizeOfTextVIEwForTextContainer(NSLayoutManager *,UIVIEw<NSTextContainerVIEw> *,NSTextContainer *,NSUInteger)(),/SourceCache/UIFoundation/UIFoundation-371.13/UIFoundation/TextSystem/NSLayoutManager_Private.m:15472015-04-09 10:48:42.312 Formula Stocks[3933:964941] <nsxpcconnection: 0x1701061e0> connection to service named com.apple.CoreAuthentication.daemon: Warning: Exception caught during deCoding of received reply to message 'evaluatePolicy:options:reply:',dropPing incoming message and calling failure block.Exception: Only run on the main thread!

这是我的身份验证功能：

func requestFingerprintAuthentication() {    // Get the local authentication context.    let context = LAContext()    // Declare a NSError variable.    var error: NSError?    // Set the reason string that will appear on the authentication alert.    var reasonString = "Sign In."    // Check if the device can evaluate the policy.    if context.canEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics,error: &error) {        [context .evaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics,localizedReason: reasonString,reply: { (success: Bool,evalPolicyError: NSError?) -> VoID in            if success {                NSOperationQueue.mainQueue().addOperationWithBlock({ () -> VoID in                    println("successfull signin with touchID")                    self.emailTextFIEld.text = emailID as! String                    self.passwordTextFIEld.text = passwordID as! String                    self.signIn(self.signInbutton)                })            }            else{                // If authentication Failed then show a message to the console with a short description.                // In case that the error is a user fallback,then show the password alert vIEw.                println(evalPolicyError?.localizedDescription)                switch evalPolicyError!.code {                case LAError.SystemCancel.rawValue:                    println("Authentication was cancelled by the system")                case LAError.UserCancel.rawValue:                    println("Authentication was cancelled by the user")                case LAError.UserFallback.rawValue:                    println("User selected to enter custom password")                    self.passwordTextFIEld.becomeFirstResponder()                default:                    println("Authentication Failed")                    self.passwordTextFIEld.becomeFirstResponder()                }            }        })]    }    else{        // If the security policy cannot be evaluated then show a short message depending on the error.        switch error!.code{        case LAError.touchIDNotEnrolled.rawValue:            println("touchID is not enrolled")        case LAError.PasscodeNotSet.rawValue:            println("A passcode has not been set")        default:            // The LAError.touchIDNotAvailable case.            println("touchID not available")        }        // Optionally the error description can be displayed on the console.        println(error?.localizedDescription)        // Show the custom alert vIEw to allow users to enter the password.        //self.showPassworDalert()        self.passwordTextFIEld.becomeFirstResponder()    }}

它会打印出来

Optional("Fallback authentication mechanism selected.")User selected to enter custom password

所以我知道它正在调用正确的.case

任何帮助它选择我的UITextFIEld将不胜感激！

解决方法 您需要在主线程上放置becomeFirstResponder. iOS要求所有UI *** 作都在主线程上.在使用闭包时(Objective-C中的块),您经常会在主线程上意外地关闭UI.你得到的常见错误是UI“冻结”了几秒钟.这是你需要时不在主线程上的经典案例.

您的情况略有不同,但控制台中的日志给出了答案：“例外：仅在主线程上运行！”

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