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例如以下代碼是實現調用5S以上設備指紋識別的代碼，依照官網給出的代碼，會出現識別成功後非常久才運行成功後調用的代碼，逛了非常久的。才知道要將其放入主線程實現才幹夠。

詳細代碼例如以下。

1、引入類 import LocalAuthentication

//調用指紋識別函數
    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 = "彈出指紋識別框時提示用戶的字符串"
            // 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 //放到主線程運行。這裏特別重要
                        if success
                        {
                         	//調用成功後你想做的事情   
                        }
                        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("您還沒有保存TouchID指紋")
                caseLAError.PasscodeNotSet.rawValue:
                    println("您還沒有設置密碼")
                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下調用Touch ID實現指紋識別