OC语言实现指纹识别

- (void) anthTouchID:(NSString *) describe complete:(void(^)(NSString *backStr)) complete
{
//检查操作系统是否达到指纹识别要求
if([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0){

//检查Touch ID是否可用
LAContext *anthContext = [[LAContext alloc]init];
NSError *error = [[NSError alloc]init];

BOOL touchIDAvailable = [anthContext canEvaluatePolicy:kLAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error];

if (touchIDAvailable) {

//指纹识别可用，获取验证结果
[anthContext evaluatePolicy:kLAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:describe reply:^(BOOL success, NSError * _Nullable error) {

//加入主线程中执行
dispatch_async(dispatch_get_main_queue(), ^{
if (success) {

//验证通过
if (complete) {
complete(@"success");
}

} else {

//验证失败
if (complete) {
complete(error.localizedDescription);
}
}
});
}];

} else {

//指纹识别不可用
if (complete) {
complete(error.localizedDescription);
}
}

} else {

//设备操作系统版本过低
if (complete) {
complete(@"Device system version too low.");
}
}
}

[self anthTouchID:@"指纹识别的测试调用" complete:^(NSString *backStr) {
NSLog(@"输出:%@",backStr);
}];