//导入类库 import LocalAuthentication

func touchID() {

//创建上下文

let context = LAContext()

var error : NSError?

//判断设备是否支持指纹识别

if context.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &error)

{

//开始指纹识别

context.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, localizedReason: "请用指纹解锁", reply: { (success, error) in

if success {

debugPrint("successful")

//do what you want

}else

{

if let error = error as NSError?

{

switch error.code {

case LAError.appCancel.rawValue:

debugPrint("Authentication was cancelled by application")

case LAError.authenticationFailed.rawValue:

debugPrint("The user failed to provide valid credentials")

case LAError.invalidContext.rawValue:

debugPrint("The context is invalid")

case LAError.passcodeNotSet.rawValue:

debugPrint("Passcode is not set on the device")

case LAError.systemCancel.rawValue:

debugPrint("Authentication was cancelled by the system")

case LAError.touchIDLockout.rawValue:

debugPrint("Too many failed attempts.")

case LAError.touchIDNotAvailable.rawValue:

debugPrint("TouchID is not available on the device")

case LAError.userCancel.rawValue:

debugPrint("The user did cancel")

case LAError.userFallback.rawValue:

debugPrint("The user chose to use the fallback")

default:

debugPrint( "Did not find error code on LAError object")

}

}

}

})

}else

{

debugPrint("no support")

}

}