浅析IOS开发TouchID指纹解锁功能

#import <LocalAuthentication/LocalAuthentication.h>

- (BOOL)canEvaluatePolicy:(LAPolicy)policy error:(NSError * __autoreleasing *)error __attribute__((swift_error(none)));

- (void)evaluatePolicy:(LAPolicy)policy  localizedReason:(NSString *)localizedReason     reply:(void(^)(BOOL success, NSError * __nullable error))reply;

 //创建LAContext LAContext *context = [LAContext new];  //这个属性是设置指纹输入失败之后的弹出框的选项 context.localizedFallbackTitle = @"没有忘记密码";

NSError *error = nil; if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {  NSLog(@"支持指纹识别");  [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"指纹解锁" reply:^(BOOL success, NSError * _Nullable error) {   if (success) {    NSLog(@"验证成功 刷新主界面");   }else{    NSLog(@"%@",error.localizedDescription);    switch (error.code) {     case LAErrorSystemCancel:     {      NSLog(@"系统取消授权，如其他APP切入");      break;     }     case LAErrorUserCancel:     {      NSLog(@"用户取消验证Touch ID");      break;     }     case LAErrorAuthenticationFailed:     {      NSLog(@"授权失败");      break;     }     case LAErrorPasscodeNotSet:     {      NSLog(@"系统未设置密码");      break;     }     case LAErrorTouchIDNotAvailable:     {      NSLog(@"设备Touch ID不可用，例如未打开");      break;     }     case LAErrorTouchIDNotEnrolled:     {      NSLog(@"设备Touch ID不可用，用户未录入");      break;     }     case LAErrorUserFallback:     {      [[NSOperationQueue mainQueue] addOperationWithBlock:^{       NSLog(@"用户选择输入密码，切换主线程处理");      }];      break;     }     default:     {      [[NSOperationQueue mainQueue] addOperationWithBlock:^{       NSLog(@"其他情况，切换主线程处理");      }];      break;     }    }   }  }]; }else{  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); }