Question

当显示Touch ID警报时，还有一个“取消”按钮。我宁愿不允许用户取消，因为他们被禁止继续下去。 1.有没有办法删除“取消”按钮。 2.如果需要“取消”按钮，如何强制用户使用指纹重新进行身份验证？如果第二次调用authenticate（），Touch ID API就会允许它们进入。没有替代密码，我不想为它编写另一个视图控制器。

func authenticate() {
    let myContext:LAContext = LAContext()
    let authError:NSErrorPointer = nil
    if (myContext.canEvaluatePolicy(.DeviceOwnerAuthenticationWithBiometrics, error: authError)) {
        myContext.evaluatePolicy(.DeviceOwnerAuthenticationWithBiometrics, localizedReason: "Press fingerprint", reply: { (success:Bool, error:NSError?) -> Void in
            if success == true {
                log.debug("SUCCESSFUL AUTHENTICATION")
                dispatch_async(dispatch_get_main_queue(), { () -> Void in
                    self.performSegueWithIdentifier("showUI", sender: self)
                })
            }
            else {
                log.debug("FAILED AUTHENTICATION")

                self.authenticate()
            }
        })
    }

}

Answer 1

您需要将失败调用发送到主队列上的self.authenticate;

func authenticate() {
    let myContext:LAContext = LAContext()
    let authError:NSErrorPointer = nil
    if (myContext.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: authError)) {
        myContext.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, localizedReason: "Press fingerprint", reply: { (success:Bool, error:NSError?) -> Void in
            if success {
                log.debug("SUCCESSFUL AUTHENTICATION")
                DispatchQueue.main.async { 
                    self.performSegueWithIdentifier("showUI", sender: self)
                }
            }
            else {
                log.debug("FAILED AUTHENTICATION")
                DispatchQueue.main.async {
                    self.authenticate()
                }
            }
        })
    }
}

无法阻止用户取消Touch ID

1 个答案: