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1. info.plist中添加权限申请

<key>NSFaceIDUsageDescription</key>
<string>APP would like to use Face ID</string>
<key>NSBiometricUsageDescription</key>
<string>APP would like to use Touch ID</string>

2. 添加库

Build Phases → Link Binary With Libraries → LocalAuthentication.framework

3. 实现代码

#import <LocalAuthentication/LocalAuthentication.h>// 检查是否支持认证
-(BOOL) isSupportBiometricCheck {LAContext *context = [[LAContext alloc] init];NSError *error = nil;// 检查设备是否支持生物识别认证if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthentication error:&error]) {return true;} else {return false;}
}// 认证
// title：标题 eg.生物识别登录
// subTitle：副标题 eg.使用生物识别凭证登录
// negativeText：取消文本 eg.取消
- (void)biometricCheck:(CallSN)cbSn title:(NSString *)titlesubTitle:(NSString *)subTitlenegativeButton:(NSString *)negativeText {LAContext *context = [[LAContext alloc] init];NSString *localizedReason = [NSString stringWithFormat:@"%@\\n%@", title, subTitle];[context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationlocalizedReason:localizedReasonreply:^(BOOL success, NSError * _Nullable error) {dispatch_async(dispatch_get_main_queue(), ^{if (success) {NSLog(@"认证成功");} else {NSLog(@"认证失败，原因:%@", error.description);}});}];
}

目前来看LAPolicyDeviceOwnerAuthentication优于LAPolicyDeviceOwnerAuthenticationWithBiometrics，因为LAPolicyDeviceOwnerAuthenticationWithBiometrics在验证失败时，需要重新输入一次锁屏密码或者调用LAPolicyDeviceOwnerAuthentication输入密码才可以再次被正常调用。否则直接返回生物特征已锁定，而引起认证失败。