iOS 官方 Demo

https://developer.apple.com/library/ios/samplecode/KeychainTouchID/Introduction/Intro.html

https://segmentfault.com/a/1190000002516465

基础知识

支持系统和机型

iOS系统的指纹识别功能最低支持的机型为iPhone 5s，最低支持系统为iOS 8，虽然安装iOS 7系统的5s机型可以使用系统提供的指纹解锁功能，但由于API并未开放，所以理论上第三方软件不可使用。

依赖框架

LocalAuthentication.framework

#import <LocalAuthentication/LocalAuthentication.h>

注意事项

做iOS 8以下版本适配时，务必进行API验证，避免调用相关API引起崩溃。

使用类

LAContext 指纹验证操作对象

代码

- (void)authenticateUser {//初始化上下文对象LAContext* context = [[LAContext alloc] init];//错误对象NSError* error = nil;NSString* result = @"Authentication is needed to access your notes.";//首先使用canEvaluatePolicy 判断设备支持状态if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {//支持指纹验证[context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:result reply:^(BOOL success, NSError *error) {if (success) {//验证成功，主线程处理UI}else{NSLog(@"%@",error.localizedDescription);switch (error.code) {case LAErrorSystemCancel:{NSLog(@"Authentication was cancelled by the system");//切换到其他APP，系统取消验证Touch IDbreak;}case LAErrorUserCancel:{NSLog(@"Authentication was cancelled by the user");//用户取消验证Touch IDbreak;}case LAErrorUserFallback:{NSLog(@"User selected to enter custom password");[[NSOperationQueue mainQueue] addOperationWithBlock:^{//用户选择输入密码，切换主线程处理}];break;}default:{[[NSOperationQueue mainQueue] addOperationWithBlock:^{//其他情况，切换主线程处理 }];break;}}}}];}else{//不支持指纹识别，LOG出错误详情switch (error.code) {case LAErrorTouchIDNotEnrolled:{NSLog(@"TouchID is not enrolled");break;}case LAErrorPasscodeNotSet:{NSLog(@"A passcode has not been set");break;}default:{NSLog(@"TouchID not available");break;}}NSLog(@"%@",error.localizedDescription);} }

typedef NS_ENUM(NSInteger, LAError) {//授权失败LAErrorAuthenticationFailed = kLAErrorAuthenticationFailed,//用户取消Touch ID授权LAErrorUserCancel = kLAErrorUserCancel,//用户选择输入密码LAErrorUserFallback = kLAErrorUserFallback,//系统取消授权(例如其他APP切入)LAErrorSystemCancel = kLAErrorSystemCancel,//系统未设置密码LAErrorPasscodeNotSet = kLAErrorPasscodeNotSet,//设备Touch ID不可用，例如未打开LAErrorTouchIDNotAvailable = kLAErrorTouchIDNotAvailable,//设备Touch ID不可用，用户未录入LAErrorTouchIDNotEnrolled = kLAErrorTouchIDNotEnrolled, } NS_ENUM_AVAILABLE(10_10, 8_0);

操作流程

首先判断系统版本，iOS 8及以上版本执行-(void)authenticateUser方法，方法自动判断设备是否支持和开启Touch ID。

iOS 9

感谢秋儿指出iOS 9加入了三种新的错误类型。

/// Authentication was not successful, because there were too many failed Touch ID attempts and/// Touch ID is now locked. Passcode is required to unlock Touch ID, e.g. evaluating/// LAPolicyDeviceOwnerAuthenticationWithBiometrics will ask for passcode as a prerequisite.LAErrorTouchIDLockout NS_ENUM_AVAILABLE(10_11, 9_0) = kLAErrorTouchIDLockout,/// Authentication was canceled by application (e.g. invalidate was called while/// authentication was in progress).LAErrorAppCancel NS_ENUM_AVAILABLE(10_11, 9_0) = kLAErrorAppCancel,/// LAContext passed to this call has been previously invalidated.LAErrorInvalidContext NS_ENUM_AVAILABLE(10_11, 9_0) = kLAErrorInvalidContext

其中，LAErrorTouchIDLockout是在8.0中也会出现的情况，但并未归为单独的错误类型，这个错误出现，源自用户多次连续使用Touch ID失败，Touch ID被锁，需要用户输入密码解锁，这个错误的交互LocalAuthentication.framework已经封装好了，不需要开发者关心。

LAErrorAppCancel和LAErrorSystemCancel相似，都是当前软件被挂起取消了授权，但是前者是用户不能控制的挂起，例如突然来了电话，电话应用进入前台，APP被挂起。后者是用户自己切到了别的应用，例如按home键挂起。

LAErrorInvalidContext很好理解，就是授权过程中,LAContext对象被释放掉了，造成的授权失败。

//
//  ViewController.m
//  test_ touch_ID_01
//
//  Created by admin on 2/15/16.
//  Copyright © 2016 jeffasd. All rights reserved.
//#import "ViewController.h"#import <LocalAuthentication/LocalAuthentication.h>@interface ViewController ()@property(nonatomic, strong) UIButton *authority;
@property(nonatomic, strong) UIButton *entryButton;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];_authority = [UIButton buttonWithType:UIButtonTypeCustom];_authority.frame = CGRectMake(100, 100, 200, 50);_authority.backgroundColor = [UIColor cyanColor];[_authority setTitle:@"是否支持" forState:UIControlStateNormal];[_authority addTarget:self action:@selector(canEvaluatePolicy) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:_authority];}#pragma mark - evaluatePolicy
- (void)canEvaluatePolicy{LAContext *context = [LAContext new];__block NSString *message;NSError *error;BOOL success;success = [context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error];if (success) {message = [NSString stringWithFormat:@"Touch ID is available"];}else{message = [NSString stringWithFormat:@"Touch ID is not available"];NSLog(@"%@", message);switch (error.code) {case LAErrorTouchIDNotEnrolled:NSLog(@"TouchID is not enrolled");break;case LAErrorPasscodeNotSet:NSLog(@"A passcode has not been set");break;default:NSLog(@"TouchID not available");break;}NSLog(@"localized %@",error.localizedDescription);}NSLog(@"%@", message);
}- (IBAction)entryButton:(UIButton *)sender {LAContext *context = [LAContext new];__block NSString *message;// Set text for the localized fallback button.
//    context.localizedFallbackTitle = @"Enter Password 111";
//    context.localizedFallbackTitle = @"111";
//    context.localizedFallbackTitle = @"";//show the authentication UI with our reason string[context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"Unlock access to locked feature" reply:^(BOOL success, NSError * _Nullable authenticationError) {if (success) {//验证成功，主线程处理UImessage = @"evaluatePolicy : success";}else{message = [NSString stringWithFormat:@"evaluatePolicy %@", authenticationError.localizedDescription];NSLog(@"%@", message);NSLog(@"%@",authenticationError.localizedDescription);switch (authenticationError.code) {case LAErrorSystemCancel:{NSLog(@"Authentication was cancelled by the system");//切换到其他APP，系统取消验证Touch IDbreak;}case LAErrorUserCancel:{NSLog(@"Authentication was cancelled by the user");//用户取消验证Touch IDbreak;}case LAErrorUserFallback:{NSLog(@"User selected to enter custom password");[[NSOperationQueue mainQueue] addOperationWithBlock:^{//用户选择输入密码，切换主线程处理UIView *view = [UIView new];view.frame = self.view.bounds;view.backgroundColor = [UIColor yellowColor];[self.view addSubview:view];}];break;}case LAErrorAuthenticationFailed:{NSLog(@"User kLAErrorAuthenticationFailed");[[NSOperationQueue mainQueue] addOperationWithBlock:^{//用户选择输入密码，切换主线程处理}];break;}default:{[[NSOperationQueue mainQueue] addOperationWithBlock:^{//其他情况，切换主线程处理}];break;}}}NSLog(@"%@", message);}];
}- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated.
}@end

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