首先引入类名：
#import <LocalAuthentication/LocalAuthentication.h>
其次：
LAContext * authenticationContext = [[LAContextalloc] init];
NSError* error = [[NSErroralloc]init];
BOOL isTouchIdAvailable = [authenticationContext canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error];
if(isTouchIdAvailable ) {
NSLog(@"认证策略成功");
//可以进行指纹识别认证，在Home键录入指纹比对
[authenticationContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometricslocalizedReason:@"需要验证您的指纹来确认您的身份信息" reply:^(BOOL success, NSError *error) {
if(success) {
NSLog(@"恭喜，您通过了Touch ID指纹验证!");
}else{
NSLog(@"抱歉，您未通过了Touch ID指纹验证!");
}
}];
}else{
NSLog(@"认证策略失败,error === %@",error);
}
