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：

提示：指纹识别必须用真机测试

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LM_TouchID.h 内容：

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

#import 
#import 

@protocol LM_TouchID_Delegate 
//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 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)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)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 ()
@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