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Swift下调用Touch ID实现指纹识别
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例如以下代码是实现调用5S以上设备指纹识别的代码,依照官网给出的代码,会出现识别成功后非常久才运行成功后调用的代码,逛了非常久的。才知道要将其放入主线程实现才干够。
详细代码例如以下。
1、引入类 import LocalAuthentication
//调用指纹识别函数 func loginWithTouchID() { if((UIDevice.currentDevice().systemVersionasNSString).floatValue >= 8.0) { // 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 = "弹出指纹识别框时提示用户的字符串" // 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?) -> Voidin dispatch_async(dispatch_get_main_queue(), { () -> Voidin //放到主线程运行。这里特别重要 if success { //调用成功后你想做的事情 } 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) } }) }) } else { // If the security policy cannot be evaluated then show a short message depending on the error. switch error!.code { caseLAError.TouchIDNotEnrolled.rawValue: println("您还没有保存TouchID指纹") caseLAError.PasscodeNotSet.rawValue: println("您还没有设置密码") default: // The LAError.TouchIDNotAvailable case. println("TouchID不可用") } // 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. } } }
Swift下调用Touch ID实现指纹识别