无法阻止用户取消 Touch ID

Question

显示 Touch ID 警报时，还有一个 "Cancel" 按钮。我宁愿不允许用户取消，因为他们被禁止继续。 1.有没有办法去掉"Cancel"按钮。 2.如果需要"Cancel"按钮，如何强制用户重新使用指纹进行认证？如果 authenticate() 被第二次调用，Touch ID API 只会让他们进入。没有替代密码，我不想再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

您需要将失败调用分派到主队列上的 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

Can't prevent user from cancelling Touch ID

ios

swift

touch-id