ios下载指纹验证（苹果appstore指纹验证）

指纹验证这个功能现在在一些app中经常常见，常常与数字解锁，手势解锁联合起来使用。前几天接到说实现一个指纹验证的功能，捣鼓了挺久，然后今天，我就简单的介绍下指纹验证，会做个简单的demo实现一下基本的功能。

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。实现起来呢，其实还是很简单的，下面我们就用纯代码方式实现一个简单的demo1。

第一部分：调用原生服务实现指纹验证

这部分了解个大概就可以了

第一步：添加localauthentication.framework库

ios下载指纹验证（苹果appstore指纹验证）

第二步：在appdelegate.m中添加代码
这个不说其实大家也都知道的吧。

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 #import "appdelegate.h" #import "viewcontroller.h" @interface appdelegate () @end @implementation appdelegate - (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions { //appdelegate _window = [[uiwindow alloc]initwithframe:[uiscreen mainscreen].bounds]; _window.backgroundcolor = [uicolor whitecolor]; [_window makekeyandvisible]; viewcontroller *vc = [[viewcontroller alloc]init]; uinavigationcontroller *na = [[uinavigationcontroller alloc]initwithrootviewcontroller:vc]; _window.rootviewcontroller = na; return yes; }

第三步
引入头文件

#import <localauthentication/localauthentication.h>

第四步：实现指纹验证

这一步就是很重要的地方了，在- (void)viewdidload中写入验证实现的代码，这里只有两步，因为lacontext在官方文档中只有两个方法:

1 2 3 4 5 -canevaluatepolicy:error: //-(bool)canevaluatepolicy:(lapolicy)policy error:(nserror * __autoreleasing *)error __attribute__((swift_error(none))); -evaluatepolicy:localizedreason:reply: //- (void)evaluatepolicy:(lapolicy)policy localizedreason:(nsstring *)localizedreason reply:(void(^)(bool success, nserror * __nullable error))reply;

一个是判断设备是否支持touchid，一个是进行验证返回不同的结果，之前在网上经常可以一些文章中写了，指纹验证的第一步都是先判断设备的系统版本等等，现在似乎都不需要了，只要调用该方法就可以了。全部的代码如下：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 - (void)viewdidload { [super viewdidload]; self.title = @"touchidsimpledemoone"; lacontext *context = [[lacontext alloc]init]; nserror *error; nsstring *result = @"需要你身份验证呢"; if ([context canevaluatepolicy:lapolicydeviceownerauthenticationwithbiometrics error:&error]) { [context evaluatepolicy:lapolicydeviceownerauthenticationwithbiometrics localizedreason:result reply:^(bool success, nserror *error) { if (success) { //验证成功，主线程处理ui //这个地方呢就是写一些验证成功之后需要做些什么事情的代码。 nslog(@"验证成功"); } else { //以下是一些验证失败的原因啥的 nslog(@"%@",error.localizeddescription); switch (error.code) { case laerrorsystemcancel: { nslog(@"切换到其他app，系统取消验证touch id"); //切换到其他app，系统取消验证touch id break; } case laerrorusercancel: { nslog(@"用户取消验证touch id"); //用户取消验证touch id break; } case laerroruserfallback: { nslog(@"用户选择输入密码"); [[nsoperationqueue mainqueue] addoperationwithblock:^{ //用户选择其他验证方式，切换主线程处理 }]; break; } default: { nslog(@"laerrorauthenticationfailed，授权失败"); //授权失败 [[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(@"设备touch id不可用，用户未录入"); break; } case laerrorpasscodenotset: { nslog(@"系统未设置密码"); break; } case laerrortouchidnotavailable: { nslog(@"设备touch id不可用，例如未打开"); break; } default: { nslog(@"系统未设置密码"); break; } } nslog(@"%@",error.localizeddescription); } }

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 //指纹验证返回值 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 = klaerrortouchidnotavailable, /// authentication could not start, because touch id has no enrolled fingers. laerrortouchidnotenrolled = 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_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 } ns_enum_available(10_10, 8_0);

以上呢，就是一个简单的demo了，可能有些小问题，到时候需要的话可以自调整。这里附上这个demo的guithub链接看这里看这里，链接在这呢。

第二部分：利用现有的第三方组件实现

这个部分可以好好学习一下。

在这里呢，我要推荐一个别人写的一个第三方的组件，就是[wjtouchid](https://github.com/hu670014125/wjtouchid);这个控件的话，在这个链接上其实已经有写出怎么用了，其实不需要我再都说什么，但是我还是要说下吧。

调用时只需要一两行代码调用，但是回调函数还是需要写不少东西的。

1:复制文件进去

ios下载指纹验证（苹果appstore指纹验证）

2:引入头文件

#import "wjtouchid.h"

3:遵守协议

@interface viewcontroller ()<wjtouchiddelegate>

4: 创建对象

@property (nonatomic, strong) wjtouchid *touchid;

5:调用

1 2 3 4 5 6 7 - (void)viewdidload { [super viewdidload]; //初始化 wjtouchid *touchid = [[wjtouchid alloc]init]; [touchid startwjtouchidwithmessage:wjnotice(@"自定义信息", @"the custom message") fallbacktitle:wjnotice(@"", @"fallback title") delegate:self]; self.touchid = touchid; }

6:实现回调函数

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 @required //touchid验证成功 - (void)wjtouchidauthorizesuccess; //touchid验证失败 - (void)wjtouchidauthorizefailure; @optional //当前设备不支持指纹识别 - (void)wjtouchidisnotsupport; //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)wjtouchidauthorizeerrorappcancel; //取消touchid验证 (用户点击了取消) - (void)wjtouchidauthorizeerrorusercancel; //在touchid对话框中点击输入密码按钮 - (void)wjtouchidauthorizeerroruserfallback; //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)wjtouchidauthorizeerrorsystemcancel; //无法启用touchid,设备没有设置密码 - (void)wjtouchidauthorizeerrorpasscodenotset; //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)wjtouchidauthorizeerrortouchidlockout; //当前软件被挂起取消了授权 (授权过程中,lacontext对象被释) - (void)wjtouchidauthorizeerrorinvalidcontext; //设备没有录入touchid,无法启用touchid - (void)wjtouchidauthorizeerrortouchidnotenrolled; //该设备的touchid无效 - (void)wjtouchidauthorizeerrortouchidnotavailable;