ios - 解析匿名用户不会持久存在并导致 session 错误

Question

我当前正在使用Parse的Anonymous用户，使用逻辑，如果未检测到didFinishLaunchingWithOptions，则创建一个匿名用户:

if ([PFUser currentUser]){
        NSLog(@"there is a current user");   
} else {
        [PFUser enableAutomaticUser];
        PFACL *defaultACL = [PFACL ACL];
        [PFACL setDefaultACL:defaultACL withAccessForCurrentUser:YES];
        NSLog(@"make an Automatic user");
        [[PFUser currentUser] saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error){
            if (error){
                NSLog(@"Error: %@", error);
            }
        }];
}

但是，我遇到一个问题，即当我重新启动应用程序时，有时会匿名用户 重新创建，否则当我尝试将数据保存到同一匿名用户时它将提供 session 错误。我应该执行其他检查吗？谢谢!

Answer 1

这是我的解决方法，而不是使用“解析匿名用户”。它基于设备的identifierForVendor，它对于特定安装在特定设备上是唯一的。这意味着在正常情况下，用户仅安装一次您的应用程序，然后再对其进行更新，则该字符串将持续存在。但是，如果您要在测试设备上进行多次调试和安装/删除操作，则这不是最佳解决方案。

密码字段下面有一些非常骇人听闻的东西，您不应该在正式版应用中这样做。希望这可以帮助。

if (![PFUser currentUser]){
        NSString *uuid = [[UIDevice currentDevice] identifierForVendor].UUIDString;

        PFQuery *userQuery = [PFUser query];
        [userQuery whereKey:@"username" equalTo:uuid];
        [userQuery findObjectsInBackgroundWithBlock:^(NSArray * _Nullable objects, NSError * _Nullable error) {
            if (error){
                NSLog(@"Error: %@", error);
            } else {
                if (objects.count == 0){

                    //Make new user
                    PFUser *newUser = [PFUser user];
                    newUser.username = uuid;
                    newUser.password = @"123456";

                    NSString *deviceType = [UIDeviceHardware platformString];
                    if (deviceType){
                        [newUser setObject:deviceType forKey:@"deviceName"];
                    }

                    [newUser signUpInBackgroundWithBlock:^(BOOL succeeded, NSError * _Nullable error) {
                        if (error){
                            NSLog(@"Error: %@", error);
                        } else {
                            NSLog(@"New user signed up: %@", newUser.username);
                            NSLog(@"done");
                        }
                    }];
                } else {

                    NSString *newUUID = [NSString stringWithFormat:@"%@-%@", uuid, [self generate4Alphanumeric]];
                    PFUser *newUser = [PFUser user];
                    newUser.username = newUUID;
                    newUser.password = @"123456";

                    NSString *deviceType = [UIDeviceHardware platformString];
                    if (deviceType){
                        [newUser setObject:deviceType forKey:@"deviceName"];
                    }

                    [newUser signUpInBackgroundWithBlock:^(BOOL succeeded, NSError * _Nullable error) {
                        if (error){
                            NSLog(@"Error: %@", error);
                        } else {
                            NSLog(@"Modified user signed up: %@", newUser.username);
                            NSLog(@"done");
                        }
                    }];

                }
            }
        }];

    } else {
        NSLog(@"currentUser: %@", [PFUser currentUser].username);
    }