主要代碼如下

#import <LocalAuthentication/LocalAuthentication.h>//引入頭文件


- (void)yanzheng
{
    LAContext *lac = [[LAContext alloc] init];
    BOOL isSupport = [lac canEvaluatePolicy:kLAPolicyDeviceOwnerAuthenticationWithBiometrics error:NULL];
    lac.localizedFallbackTitle = NSLocalizedString(@"請輸入密碼", nil);
    if (isSupport) {
        [lac evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"請輸入您的Touch ID" reply:^(BOOL success, NSError * _Nullable error) {
            if (success) {
                dispatch_async(dispatch_get_main_queue(), ^{
                    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"驗證通過" delegate:self cancelButtonTitle:@"好" otherButtonTitles:nil, nil];
                    [alert show];
                });
            }else if([error.userInfo[@"NSLocalizedDescription"] isEqualToString:@"Canceled by user."]){
                dispatch_async(dispatch_get_main_queue(), ^{
                    return ;
                });
            }else{
                dispatch_async(dispatch_get_main_queue(), ^{
                   [self alertViewWithEnterPassword:YES];
                });
            }
        }];
    }else{
        NSLog(@"當前機型不支持");
    }
}

上面這段代碼是進行驗證的關(guān)鍵代碼和判斷，其中包括驗證成功，驗證失敗，和取消驗證。
如果驗證失敗，可以彈出一個輸入密碼的提示框，代碼如下:

- (void)alertViewWithEnterPassword:(BOOL)isTrue
{
    UIAlertController *alert;
    if (isTrue) {
        alert = [UIAlertController alertControllerWithTitle:@"請輸入密碼" message:@"請輸入您的支付密碼" preferredStyle:UIAlertControllerStyleAlert];
    }else{
        alert = [UIAlertController alertControllerWithTitle:@"密碼錯誤" message:@"請輸入您的支付密碼" preferredStyle:UIAlertControllerStyleAlert];
    }
    [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        textField.secureTextEntry = YES;
    }];
    UIAlertAction *backAction = [UIAlertAction actionWithTitle:@"返回指紋驗證" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        [self yanzheng];
    }];
    
    UIAlertAction *confirmAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        if ([alert.textFields.firstObject.text isEqualToString:@"123"]) {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"驗證通過" delegate:self cancelButtonTitle:@"好" otherButtonTitles:nil, nil];
            [alert show];
        }else{
            [self alertViewWithEnterPassword:NO];
        }
    }];
    [alert addAction:backAction];
    [alert addAction:confirmAction];
    [self presentViewController:alert animated:YES completion:nil];
}