版本记录

前言

LocalAuthentication是用来实现iOS中的指纹识别的，自从iPhone5s加入TouchID后，LocalAuthentication也越来越受到关注。接下来我们就一起看一下这个框架的使用。

Overview

首先看一下该框架的基本信息

LocalAuthentication，通过密码或生物识别技术请求用户的身份验证，比较典型的就是TouchID。

LocalAuthentication框架提供了用于从具有指定安全策略的用户请求认证的工具。

例如，要请求用户仅使用Face ID或Touch ID进行认证，您可以使用如下代码：

OC版本

LAContext *myContext = [[LAContext alloc] init];
NSError *authError = nil;
NSString *myLocalizedReasonString = <#String explaining why app needs authentication#>;
 
if ([myContext canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&authError]) {
    [myContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
                  localizedReason:myLocalizedReasonString
                            reply:^(BOOL success, NSError *error) {
            if (success) {
                // User authenticated successfully, take appropriate action
            } else {
                // User did not authenticate successfully, look at error and take appropriate action
            }
        }];
} else {
    // Could not evaluate policy; look at authError and present an appropriate message to user
}

Swift版本

let myContext = LAContext()
let myLocalizedReasonString = <#String explaining why app needs authentication#>
 
var authError: NSError?
if #available(iOS 8.0, macOS 10.12.1, *) {
    if myContext.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &authError) {
        myContext.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, localizedReason: myLocalizedReasonString) { success, evaluateError in
            if success {
                // User authenticated successfully, take appropriate action
            } else {
                // User did not authenticate successfully, look at error and take appropriate action
            }
        }
    } else {
        // Could not evaluate policy; look at authError and present an appropriate message to user
    }
} else {
    // Fallback on earlier versions
}

下面我们看一个该框架的详细结构。

Topics

1. Classes

• LAContext
  • 一个LAContext对象表示一个认证上下文。 LAContext类提供了一个编程接口，用于评估认证策略和访问控制，管理凭证和使认证上下文失效。

2. Reference

• LocalAuthentication Enumerations

• LocalAuthentication Constants

后记

本篇已结束，后面更精彩~~~~