Question

我试图在用户通过Facebook登录我的应用程序后保存用户名和用户电子邮件。我已经设置了一个segue来将信息从登录视图控制器传递到视图控制器，我计划将用户字符串和其他一些字符串保存到我的sqlite数据库中。当我在目标视图控制器中运行我的应用程序并尝试将所有数据插入sqlite时，我抛出一个错误，说userName和userEmail是nil字符串，所以我的数据没有被保存。我已经正确设置了segue;合成，添加属性。但在我看来问题可能是我如何检索数据。非常感谢帮助！提前谢谢！

-(void)prepareForSegue:(UIStoryboardSegue *)segue user:(id<FBGraphUser>)user sender:(id)sender{
    if([segue.identifier isEqualToString:@"loginInfo"]) {
        NSString *name = user.name;
        NSString *email = [user objectForKey:@"email"];
        ViewController *vc = (ViewController *)[segue destinationViewController];
        vc.userName = name;
        vc.userEmail = email;
        NSLog(@"user data is being prepared to segue");
    }
}

Answer 1

您使用过 - （void）prepareForSegue：（UIStoryboardSegue *）segue用户：（id）用户发件人：（id）发件人

在UIViewController类中没有用于segue展开的方法。而不是那个使用 -

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if([segue.identifier isEqualToString:@"loginInfo"]) {
        NSString *name = user.name;
        NSString *email = [user objectForKey:@"email"];
        ViewController *vc = (ViewController *)[segue destinationViewController];
        vc.userName = name;
        vc.userEmail = email;
        NSLog(@"user data %@, email %@",name,email);
     }
}

获取实现facebook委托所需的用户信息。

- (void)meRequestResult:(id)result WithError:(NSError *)error
{
    NSLog(@"result %@",result );

    if ([result isKindOfClass:[NSDictionary class]])
    {
        NSDictionary *dictionary;
        if([result objectForKey:@"data"])
            dictionary = (NSDictionary *)[(NSArray *)[result objectForKey:@"data"] objectAtIndex:0];
        else
            dictionary = (NSDictionary *)result;


        email = [dictionary valueForKey:@"email"];
        fName = [dictionary valueForKey:@"first_name"];
        lName = [dictionary valueForKey:@"last_name"];

     }
}

如何将Facebook用户信息发送到另一个视图控制器？

1 个答案: