iOS_使用LAContext实现TouchID(指纹识别)的使用

在iPhone5s问世后，苹果的后续移动设备相继添加了指纹功能，从实际使用中还是相当方便的，比如快捷支付、快捷登录等应用场景，系统也提供给了我们相关的操作框架：LocalAuthentication，使用LAContext对象即可完成指纹识别，由于指纹识别时遇到的情况也比较多，所以我做了相应的封装，代码具体如下：

LM_TouchID.h 内容：

//
//  LM_TouchID.h
//  TouchID
//
//  Created by CoderDoctorLee on 16/6/16.
//  Copyright © 2016年 CoderDoctorLee. All rights reserved.
//

#import <UIKit/UIKit.h>
#import <LocalAuthentication/LocalAuthentication.h>

@protocol LM_TouchID_Delegate <NSObject>
//必须实现的两个代理方法:
@required
/**
*  @author CoderDoctorLee, 16-06-16 22:06:06
*
*  验证成功
*/
- (void)LM_TouchID_AuthorizeSuccess;
/**
*  @author CoderDoctorLee, 16-06-16 22:06:41
*
*  验证失败
*/
- (void)LM_TouchID_AuthorizeFailure;

//选择实现的代理方法:
@optional

/**
*  @author CoderDoctorLee, 16-06-16 22:06:12
*
*  取消了验证（点击了取消）
*/
- (void)LM_TouchID_AuthorizeUserCancel;

/**
*  @author CoderDoctorLee, 16-06-16 22:06:58
*
*  在TouchID对话框点击输入密码按钮
*/
- (void)LM_TouchID_AuthorizeUserFallBack;

/**
*  @author CoderDoctorLee, 16-06-16 22:06:58
*
*   在验证的TouchID的过程中被系统取消 例如突然来电话、按了Home键、锁屏...
*/
- (void)LM_TouchID_AuthorizeSystemCancel;

/**
*  @author CoderDoctorLee, 16-06-16 22:06:18
*
*  无法使用TouchID,设备没有设置密码
*/
- (void)LM_TouchID_AuthorizePasswordNotSet;

/**
*  @author CoderDoctorLee, 16-06-16 22:06:15
*
*  没有录入TouchID,无法使用
*/
- (void)LM_TouchID_AuthorizeTouchIDNotSet;

/**
*  @author CoderDoctorLee, 16-06-16 22:06:19
*
*  该设备的TouchID无效
*/
- (void)LM_TouchID_AuthorizeTouchIDNotAvailable;

/**
*  @author CoderDoctorLee, 16-06-16 22:06:17
*
*  多次连续使用Touch ID失败，Touch ID被锁，需要用户输入密码解锁
*/
- (void)LM_TouchID_AuthorizeTouchIDNotLockOut;

/**
*  @author CoderDoctorLee, 16-06-16 22:06:47
*
*  当前软件被挂起取消了授权(如突然来了电话,应用进入前台)
*/
- (void)LM_TouchID_AuthorizeTouchIDAppCancel;

/**
*  @author CoderDoctorLee, 16-06-16 22:06:45
*
*  当前软件被挂起取消了授权 (授权过程中,LAContext对象被释)
*/
- (void)LM_TouchID_AuthorizeTouchIDInvalidContext;

/**
*  @author CoderDoctorLee, 16-06-16 22:06:29
*
*  当前设备不支持指纹识别
*/
- (void)LM_TouchID_AuthorizeNotSupport;
@end

@interface LM_TouchID : LAContext
@property (nonatomic, assign) id<LM_TouchID_Delegate> delegate;
/**
*  @author CoderDoctorLee, 16-06-16 22:06:51
*
*  发起指纹验证：
*/
- (void)startLM_TouchID_WithMessage:(NSString *)message FallBackTitle:(NSString *)fallBackTitle Delegate:(id<LM_TouchID_Delegate>)delegate;
@end

LM_TouchID.m 内容：

//
//  LM_TouchID.m
//  TouchID
//
//  Created by CoderDoctorLee on 16/6/16.
//  Copyright © 2016年 CoderDoctorLee. All rights reserved.
//

#import "LM_TouchID.h"

@implementation LM_TouchID
- (void)startLM_TouchID_WithMessage:(NSString *)message FallBackTitle:(NSString *)fallBackTitle Delegate:(id<LM_TouchID_Delegate>)delegate
{
LAContext *context = [[LAContext alloc] init];
context.localizedFallbackTitle = fallBackTitle;

NSError *error = nil;
self.delegate = delegate;
//判断代理人是否为空
if (self.delegate != nil) {
if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {
//使用context对象对识别的情况进行评估
[context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:message reply:^(BOOL success, NSError * _Nullable error) {
//识别成功:
if (success) {
if ([self.delegate respondsToSelector:@selector(LM_TouchID_AuthorizeSuccess)]) {
//必须回到主线程执行,否则在更新UI时会出错！以下相同
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self.delegate LM_TouchID_AuthorizeSuccess];
}];
}
}
//识别失败（对应代理方法的每种情况,不实现对应方法就没有反应）
else if (error)
{
switch (error.code) {
case LAErrorAuthenticationFailed:{
if ([self.delegate respondsToSelector:@selector(LM_TouchID_AuthorizeFailure)]) {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self.delegate LM_TouchID_AuthorizeFailure];
}];
}
break;
}
case LAErrorUserCancel:{
if ([self.delegate respondsToSelector:@selector(LM_TouchID_AuthorizeUserCancel)]) {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self.delegate LM_TouchID_AuthorizeUserCancel];
}];
}
break;
}
case LAErrorUserFallback:{
if ([self.delegate respondsToSelector:@selector(LM_TouchID_AuthorizeUserFallBack)]) {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self.delegate LM_TouchID_AuthorizeUserFallBack];
}];
}
break;
}
case LAErrorSystemCancel:{
if ([self.delegate respondsToSelector:@selector(LM_TouchID_AuthorizeSystemCancel)]) {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self.delegate LM_TouchID_AuthorizeSystemCancel];
}];
}
break;
}
case LAErrorTouchIDNotEnrolled:
{
if ([self.delegate respondsToSelector:@selector(LM_TouchID_AuthorizeTouchIDNotSet)]) {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self.delegate LM_TouchID_AuthorizeTouchIDNotSet];
}];
}
break;
}
case LAErrorPasscodeNotSet:{
if ([self.delegate respondsToSelector:@selector(LM_TouchID_AuthorizePasswordNotSet)]) {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self.delegate LM_TouchID_AuthorizePasswordNotSet];
}];
}
break;
}
case LAErrorTouchIDNotAvailable:{
if ([self.delegate respondsToSelector:@selector(LM_TouchID_AuthorizeTouchIDNotAvailable)]) {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self.delegate LM_TouchID_AuthorizeTouchIDNotAvailable];
}];
}
break;
}
case LAErrorTouchIDLockout:{
if ([self.delegate respondsToSelector:@selector(LM_TouchID_AuthorizeTouchIDNotLockOut)]) {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self.delegate LM_TouchID_AuthorizeTouchIDNotLockOut];
}];
}
break;
}
case LAErrorAppCancel:{
if ([self.delegate respondsToSelector:@selector(LM_TouchID_AuthorizeTouchIDAppCancel)]) {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self.delegate LM_TouchID_AuthorizeTouchIDAppCancel];
}];
}
break;
}
case LAErrorInvalidContext:{
if ([self.delegate respondsToSelector:@selector(LM_TouchID_AuthorizeTouchIDInvalidContext)]) {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self.delegate LM_TouchID_AuthorizeTouchIDInvalidContext];
}];
}
break;
}
default:
break;
}
}
}];
}
}
//设备不支持指纹识别
else
{
if ([self.delegate respondsToSelector:@selector(LM_TouchID_AuthorizeNotSupport)]) {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self.delegate LM_TouchID_AuthorizeNotSupport];
}];
}
}
}
@end

在ViewController里使用示例：

//
//  ViewController.m
//  TouchID
//
//  Created by CoderDoctorLee on 16/6/17.
//  Copyright © 2016年 CoderDoctorLee. All rights reserved.
//

#import "ViewController.h"
#import "LM_TouchID.h"
@interface ViewController ()<LM_TouchID_Delegate>
@property(nonatomic, strong)UILabel *label;
@property(nonatomic, strong)LM_TouchID *touchID;
@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
//用来显示验证信息
self.label = [[UILabel alloc] initWithFrame:CGRectMake(100, 100, 175, 50)];
_label.backgroundColor = [UIColor blueColor];
_label.textColor = [UIColor whiteColor];
[self.view addSubview:_label];

self.touchID = [[LM_TouchID alloc] init];
//开始验证：
[_touchID startLM_TouchID_WithMessage:@"请验证指纹转账100万" FallBackTitle:@"输入密码" Delegate:self];
}
- (void)LM_TouchID_AuthorizeSuccess
{
_label.text = @"验证成功";
}
- (void)LM_TouchID_AuthorizeFailure
{
_label.text = @"验证失败";
}
- (void)LM_TouchID_AuthorizeNotSupport
{
_label.text = @"设备不支持";
}
- (void)LM_TouchID_AuthorizeUserCancel
{
_label.text = @"用户取消了验证";
}
//其他代理方法就不一一实现了，大家可以自行测验
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end