IOS 指纹识别两种方式详解及实例

#import <localauthentication/localauthentication.h>

lacontext *lacontext = [[lacontext alloc]init];
  // 判断设备是否支持指纹识别
  bool issupport = [lacontext canevaluatepolicy:lapolicydeviceownerauthenticationwithbiometrics error:null];
  if(!issupport)
  {
    nslog(@"不支持！");
    return;
  }
  [lacontext evaluatepolicy:lapolicydeviceownerauthenticationwithbiometrics localizedreason:@"请按下手印" reply:^(bool success, nserror *error) {
    if(success)
    {
      nslog(@"成功后，处理接下来的逻辑");
    }
  }];

if ([uidevice currentdevice].systemversion.floatvalue < 8.0) {
    nslog(@"不支持");
    return;
  }

  lacontext *ctx = [[lacontext alloc] init];
  // 判断设备是否支持指纹识别
  if ([ctx canevaluatepolicy:lapolicydeviceownerauthenticationwithbiometrics error:null]) {
    nslog(@"支持");
    // 输入指纹，异步
    // 提示：指纹识别只是判断当前用户是否是手机的主人！程序原本的逻辑不会受到任何的干扰！
    [ctx evaluatepolicy:lapolicydeviceownerauthenticationwithbiometrics localizedreason:@"指纹登录" reply:^(bool success, nserror *error) {
      if (success) {
        // 登录成功
        // todo
        nslog(@"登陆成功");
      }
    }];
  } else {
    nslog(@"不支持");
  }