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：
提示：指纹识别必须用真机测试
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
网友评论
[context evaluatePolicy:LAPolicyDeviceOwnerAuthentication
localizedReason:@"请验证已有指纹"
reply:^(BOOL success, NSError * _Nullable error) {
if (success) {
if ([context evaluatedPolicyDomainState] != nil) {
NSLog(@"指纹验证成功");
}else{
NSLog(@"TOUCH ID 解锁成功"); //系统密码输入成功
}
} else {
NSLog(@"指纹验证失败：\n\n%@", error.userInfo[NSLocalizedDescriptionKey]);
}
}];