最近在項目中剛好用到了TouchId指紋解鎖功能大咱，之前也沒有接觸過，立馬百度看看究竟是要如何使用轻专，發(fā)現(xiàn)其實也不是很復雜。
文章后面有封裝的工具方法察蹲，可以直接copy使用请垛。
下面開始跟大家分享一下：
一、使用要點：
（1）需要導入庫 LocalAuthentication.framework
（2）引入頭文件 #import <LocalAuthentication/LocalAuthentication.h>
（3）指紋解鎖只支持iOS 8及以上的版本
（4）如果指紋驗證多次錯誤會被鎖定洽议，只能通過輸入手機密碼來重新啟用宗收。iOS 9 提供了一個方法，可以直接調起密碼輸入界面亚兄。
（5）所有操作必須要回到主線程混稽，因為系統(tǒng)的驗證是在子線程。
（6）所有的錯誤處理是通過一個枚舉來判斷處理的审胚，具體作用看注釋
二匈勋、代碼要點
（1）這是判斷系統(tǒng)版本是否大于iOS 8
if (!(MQ_CURRENT_DEVICE_SYSTEM_VERSION >= 8.0)) {
result(NO, MQ_TOUCHID_ERROR_SYSTEM_NOT_SUPPORT);
return;
}
（2）判斷是否可用
// 返回bool值
[authenContext canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]
（3）下面的就是重要的點 :
指紋解鎖多次失敗以后，系統(tǒng)會鎖定TouchID硬件必須通過輸入手機密碼來解鎖膳叨，如果系統(tǒng)是iOS8的話洽洁，TouchID被鎖定以后只能通過重啟手機來重新開啟。
//系統(tǒng)提供的兩個驗證的枚舉
typedef NS_ENUM(NSInteger, LAPolicy)
{
LAPolicyDeviceOwnerAuthenticationWithBiometrics NS_ENUM_AVAILABLE(NA, 8_0) __WATCHOS_AVAILABLE(3.0) __TVOS_AVAILABLE(10.0) = kLAPolicyDeviceOwnerAuthenticationWithBiometrics,
LAPolicyDeviceOwnerAuthentication NS_ENUM_AVAILABLE(10_11, 9_0) = kLAPolicyDeviceOwnerAuthentication
} NS_ENUM_AVAILABLE(10_10, 8_0) __WATCHOS_AVAILABLE(3.0) __TVOS_AVAILABLE(10.0);
kLAPolicyDeviceOwnerAuthentication 這個值只有在iOS9.0及以后才可以使用菲嘴，利用這個值可以調出輸入密碼來解鎖TouchID的界面饿自。
[authenContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
localizedReason:TOUCHID_NOTICE_MESSAGE
reply:^(BOOL success, NSError * _Nullable error) {
if (success) {
//已經重新解鎖Touchid
}
}];
開始指紋解鎖代碼
[authenContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
localizedReason:TOUCHID_NOTICE_MESSAGE
reply:^(BOOL success, NSError * _Nullable error) {
if (success) {
// 解鎖成功
}
}];
（4）看看系統(tǒng)的錯誤枚舉
typedef NS_ENUM(NSInteger, LAError)
{
/// Authentication was not successful, because user failed to provide valid credentials.
LAErrorAuthenticationFailed = kLAErrorAuthenticationFailed,
/// Authentication was canceled by user (e.g. tapped Cancel button).
LAErrorUserCancel = kLAErrorUserCancel,
/// Authentication was canceled, because the user tapped the fallback button (Enter Password).
LAErrorUserFallback = kLAErrorUserFallback,
/// Authentication was canceled by system (e.g. another application went to foreground).
LAErrorSystemCancel = kLAErrorSystemCancel,
/// Authentication could not start, because passcode is not set on the device.
LAErrorPasscodeNotSet = kLAErrorPasscodeNotSet,
/// Authentication could not start, because Touch ID is not available on the device.
LAErrorTouchIDNotAvailable NS_ENUM_DEPRECATED(10_10, 10_13, 8_0, 11_0, "use LAErrorBiometryNotAvailable") = kLAErrorTouchIDNotAvailable,
/// Authentication could not start, because Touch ID has no enrolled fingers.
LAErrorTouchIDNotEnrolled NS_ENUM_DEPRECATED(10_10, 10_13, 8_0, 11_0, "use LAErrorBiometryNotEnrolled") = kLAErrorTouchIDNotEnrolled,
/// 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_DEPRECATED(10_11, 10_13, 9_0, 11_0, "use LAErrorBiometryLockout")
__WATCHOS_DEPRECATED(3.0, 4.0, "use LAErrorBiometryLockout") __TVOS_DEPRECATED(10.0, 11.0, "use LAErrorBiometryLockout") = 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,
/// Authentication could not start, because biometry is not available on the device.
LAErrorBiometryNotAvailable NS_ENUM_AVAILABLE(10_13, 11_0) __WATCHOS_AVAILABLE(4.0) __TVOS_AVAILABLE(11.0) = kLAErrorBiometryNotAvailable,
/// Authentication could not start, because biometry has no enrolled identities.
LAErrorBiometryNotEnrolled NS_ENUM_AVAILABLE(10_13, 11_0) __WATCHOS_AVAILABLE(4.0) __TVOS_AVAILABLE(11.0) = kLAErrorBiometryNotEnrolled,
/// Authentication was not successful, because there were too many failed biometry attempts and
/// biometry is now locked. Passcode is required to unlock biometry, e.g. evaluating
/// LAPolicyDeviceOwnerAuthenticationWithBiometrics will ask for passcode as a prerequisite.
LAErrorBiometryLockout NS_ENUM_AVAILABLE(10_13, 11_0) __WATCHOS_AVAILABLE(4.0) __TVOS_AVAILABLE(11.0) = kLAErrorBiometryLockout,
/// Authentication failed, because it would require showing UI which has been forbidden
/// by using interactionNotAllowed property.
LAErrorNotInteractive API_AVAILABLE(macos(10.10), ios(8.0), watchos(3.0), tvos(10.0)) = kLAErrorNotInteractive,
} NS_ENUM_AVAILABLE(10_10, 8_0) __WATCHOS_AVAILABLE(3.0) __TVOS_AVAILABLE(10.0);
三、這是我封裝的工具類
（1）MQTouchID.h文件
//
// MQTouchID.h
// Test
//
// Created by PasserMontanus on 2018/3/21.
// Copyright ? 2018年 lgl. All rights reserved.
//
#import <Foundation/Foundation.h>
typedef NS_ENUM(NSInteger, MQ_TOUCHID_ERROR) {
// 系統(tǒng)不支持 要大于 8.0
MQ_TOUCHID_ERROR_SYSTEM_NOT_SUPPORT = 0,
// 驗證成功
MQ_TOUCHID_ERROR_SUCCESS = 1,
// 系統(tǒng)取消授權龄坪，如其他APP切入
MQ_TOUCHID_ERROR_SYSTEM_CANCEL = -4,
// 用戶取消驗證Touch ID
MQ_TOUCHID_ERROR_USER_CANCEL = -2,
// 用戶選擇輸入密碼
MQ_TOUCHID_ERROR_USER_FALLBACK = -3,
//授權失敗
MQ_TOUCHID_ERROR_FAILED = -1,
//系統(tǒng)未設置密碼 這個密碼在用戶指紋多次驗證失敗的時候要用他來重新激活
MQ_TOUCHID_ERROR_PASSCODE_NOT_SET = -5,
//設備Touch ID不可用昭雌，例如未打開
MQ_TOUCHID_ERROR_NOT_AVAILABLE = -6,
//設備Touch ID不可用，用戶沒有錄入指紋
MQ_TOUCHID_ERROR_NOT_ENROLLED = -7,
//身份驗證失敗健田，因為它需要顯示已被禁止的UI
MQ_TOUCHID_ERROR_NOT_INTERACTIVE = -1004,
// 設備Touch ID被鎖定烛卧，輸入錯誤的次數(shù)過多 這個時候需要密碼來重新激活
MQ_TOUCHID_ERROR_LOCKOUT = -8 ,
//應用程序已取消身份驗證
MQ_TOUCHID_ERROR_APP_CANCEL = -9,
// 傳遞給此調用的LAContext先前已失效。
MQ_TOUCHID_ERROR_INVALID_CONTEXT = -10
};
typedef void(^MQTouchIDResult)(BOOL isSuccess, MQ_TOUCHID_ERROR error_code);
@interface MQTouchID : NSObject
/**
開始驗證 TouchID 指紋解鎖 （需要導入 LocalAuthentication.framework）
注意: 結果回調以后的操作都需要回到主線程 這個驗證是在子線程里面執(zhí)行的
*/
+ (void)validateTouchID:(MQTouchIDResult)result;
@end
（2）MQTouchID.m文件
//
// MQTouchID.m
// Test
//
// Created by PasserMontanus on 2018/3/21.
// Copyright ? 2018年 lgl. All rights reserved.
//
#import "MQTouchID.h"
#import <LocalAuthentication/LocalAuthentication.h>
#define MQ_CURRENT_DEVICE_SYSTEM_VERSION ([[UIDevice currentDevice]systemVersion].doubleValue)
static NSString * TOUCHID_NOTICE_MESSAGE = @"通過Home鍵驗證已有的手機指紋";
static NSString * TOUCHID_NOTICE_RESTART_MESSAGE = @"重新開啟TouchID功能";
@implementation MQTouchID
+ (void)validateTouchID:(MQTouchIDResult)result {
if (!(MQ_CURRENT_DEVICE_SYSTEM_VERSION >= 8.0)) {
result(NO, MQ_TOUCHID_ERROR_SYSTEM_NOT_SUPPORT);
return;
}
LAContext *authenContext = [[LAContext alloc]init];
NSError* error = nil;
if ([authenContext canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) { // 可用
[self startValidateTouchID:authenContext result:result];
} else { // 不可用
MQ_TOUCHID_ERROR erroCode = [self errorCode:error.code];
[self processingTouchIdError:authenContext erroCode:erroCode result:result];
}
}
+ (void)startValidateTouchID:(LAContext *)authenContext result:(MQTouchIDResult)result {
[authenContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
localizedReason:TOUCHID_NOTICE_MESSAGE
reply:^(BOOL success, NSError * _Nullable error) {
if (success) {
result(YES,MQ_TOUCHID_ERROR_SUCCESS);
} else {
MQ_TOUCHID_ERROR erroCode = [self errorCode:error.code];
[self processingTouchIdError:authenContext erroCode:erroCode result:result];
}
}];
}
+ (void)processingTouchIdError:(LAContext *)authenContext
erroCode:(MQ_TOUCHID_ERROR)erroCode
result:(MQTouchIDResult)result {
if (@available(iOS 9.0, *)) {
if (erroCode == MQ_TOUCHID_ERROR_LOCKOUT) {
[authenContext evaluatePolicy:LAPolicyDeviceOwnerAuthentication
localizedReason:TOUCHID_NOTICE_RESTART_MESSAGE
reply:^(BOOL success, NSError * _Nullable error) {
if (success) {
[self validateTouchID:result];
} else {
result(NO, MQ_TOUCHID_ERROR_USER_CANCEL);
}
}];
} else {
result(NO, erroCode);
}
} else {
result(NO, erroCode);
}
}
+ (MQ_TOUCHID_ERROR)errorCode:(NSInteger )errorCode {
switch (errorCode) {
case LAErrorSystemCancel:{ // 系統(tǒng)取消授權妓局，如其他APP切入
return MQ_TOUCHID_ERROR_SYSTEM_CANCEL;
break;
}
case LAErrorUserCancel:{ // 用戶取消驗證Touch ID
return MQ_TOUCHID_ERROR_USER_CANCEL;
break;
}
case LAErrorUserFallback:{ // 用戶選擇輸入密碼
return MQ_TOUCHID_ERROR_USER_FALLBACK;
break;
}
case LAErrorAuthenticationFailed:{ // //授權失敗
return MQ_TOUCHID_ERROR_FAILED;
break;
}
case LAErrorPasscodeNotSet: { //系統(tǒng)未設置密碼 這個密碼在用戶指紋多次驗證失敗的時候要用他來重新激活
return MQ_TOUCHID_ERROR_PASSCODE_NOT_SET;
break;
}
case LAErrorTouchIDNotAvailable: { //設備Touch ID不可用唱星，例如未打開
return MQ_TOUCHID_ERROR_NOT_AVAILABLE;
break;
}
case LAErrorTouchIDNotEnrolled: { //設備Touch ID不可用雳旅，用戶沒有錄入指紋
return MQ_TOUCHID_ERROR_NOT_ENROLLED;
break;
}
case LAErrorNotInteractive: { // 身份驗證失敗，因為它需要顯示已被禁止的UI
return MQ_TOUCHID_ERROR_NOT_INTERACTIVE;
break;
}
default:{
if (@available(iOS 9.0, *)) {
if (errorCode == LAErrorTouchIDLockout) { // 設備Touch ID被鎖定间聊，輸入錯誤的次數(shù)過多 這個時候需要密碼來重新激活
return MQ_TOUCHID_ERROR_LOCKOUT;
break;
} else {
if (errorCode == LAErrorInvalidContext) {
return MQ_TOUCHID_ERROR_INVALID_CONTEXT;
break;
} else if (errorCode == LAErrorAppCancel) {
return MQ_TOUCHID_ERROR_APP_CANCEL;
break;
} else {
return MQ_TOUCHID_ERROR_FAILED;
break;
}
}
} else {
return MQ_TOUCHID_ERROR_FAILED;
break;
}
}
}
}
@end
四攒盈、最后結語
（1）最后的結果回調以后的操作一定要在主線程，系統(tǒng)驗證在子線程進行
（2）以上就是我的一點小總結哎榴，歡迎大家指正型豁。
