#import <LocalAuthentication/LocalAuthentication.h>

//iOS8.0后才支持指纹识别接口if ([UIDevice currentDevice].systemVersion.floatValue < 8.0) {return;}

- (void)evaluateAuthenticate
{//创建LAContextLAContext* context = [[LAContext alloc] init];NSError* error = nil;NSString* result = @"请验证已有指纹";//首先使用canEvaluatePolicy 判断设备支持状态if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {//支持指纹验证[context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:result reply:^(BOOL success, NSError *error) {if (success) {//验证成功，主线程处理UI
            }else{NSLog(@"%@",error.localizedDescription);switch (error.code) {case LAErrorSystemCancel:{//系统取消授权，如其他APP切入break;}case LAErrorUserCancel:{//用户取消验证Touch IDbreak;}case LAErrorAuthenticationFailed:{//授权失败break;}case LAErrorPasscodeNotSet:{//系统未设置密码break;}case LAErrorTouchIDNotAvailable:{//设备Touch ID不可用，例如未打开break;}case LAErrorTouchIDNotEnrolled:{//设备Touch ID不可用，用户未录入break;}case LAErrorUserFallback:{[[NSOperationQueue mainQueue] addOperationWithBlock:^{//用户选择输入密码，切换主线程处理
                            }];break;}default:{[[NSOperationQueue mainQueue] addOperationWithBlock:^{//其他情况，切换主线程处理
                        }];break;}}}}];}else{//不支持指纹识别，LOG出错误详情NSLog(@"不支持指纹识别");switch (error.code) {case LAErrorTouchIDNotEnrolled:{NSLog(@"TouchID is not enrolled");break;}case LAErrorPasscodeNotSet:{NSLog(@"A passcode has not been set");break;}default:{NSLog(@"TouchID not available");break;}}NSLog(@"%@",error.localizedDescription);}
}