Swift下調用Touch ID實現指紋識別

標籤：

如下代碼是實現調用5S以上裝置指紋識別的代碼，按照官網給出的代碼，會出現識別成功後很久才執行成功後調用的代碼，逛了很久的，才知道要將其放入主線程實現才可以。具體代碼如下。

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使用者的字串"            // 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 //放到主線程執行，這裡特別重要                        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("您還沒有儲存TouchID指紋")                caseLAError.PasscodeNotSet.rawValue:                    println("您還沒有設定密碼")                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.            }        }    }



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Swift下調用Touch ID實現指紋識別