ios-Facebook 登录委托方法不起作用

Posted 2023-03-11

【中文标题】ios-Facebook 登录委托方法不起作用

【英文标题】：ios-Facebook login delegate method isn't working

【发布时间】：2015-06-07 16:54:40

【问题描述】：

目标是在用户登录后跳转到另一个ViewController，但在用户取消授权时保持原来的页面。我尝试使用委托方法但不起作用。我认为我可能不完全理解委托在 Facebook SDK 中的工作原理。我正确设置了 appDelegate，因为 Facebook 按钮工作正常。非常感谢您的帮助，因为我已经为此苦苦挣扎了很长时间！ :)

---

//  MainViewController.h
#import  <UIKit/UIKit.h>
#import "AnotherViewController.h"
#import <FBSDKCoreKit/FBSDKCoreKit.h>
#import <FBSDKLoginKit/FBSDKLoginKit.h>

@interface MainViewController : UIViewController <FBSDKLoginButtonDelegate>

@property (weak, nonatomic) IBOutlet id<FBSDKLoginButtonDelegate> delegate;
@property (weak, nonatomic) IBOutlet FBSDKLoginButton *FBButton;


@end

---

//MainViewController.m

#import "MainViewController.h"

@interface MainViewController () <FBSDKLoginButtonDelegate>

@end

@implementation MainViewController

- (void)viewDidLoad 
    [super viewDidLoad];

    //set the delegate to self in order for the delegate protocol methods to be notified
    FBSDKLoginButton *loginBtn = [[FBSDKLoginButton alloc] init];
    loginBtn.delegate = self;

 if ([FBSDKAccessToken currentAccessToken]) 
        // User is logged in, do work such as go to next view controller.
        UIViewController *secondCV = [[UIStoryboard storyboardWithName:@"Main" bundle:NULL]instantiateViewControllerWithIdentifier:@"AnotherViewController"];

        [self presentViewController:secondCV animated:YES completion:nil];
    


- (void)didReceiveMemoryWarning 
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.


- (void)loginButton:(FBSDKLoginButton *)loginButton didCompleteWithResult:(FBSDKLoginManagerLoginResult *)result error:(NSError *)error
    if(!error)
        NSLog(@"You've Logged in");
        NSLog(@"%@", result);

       //I want to go to anotherViewController after they log in
        AnotherViewController *secondVC = [[AnotherViewController alloc] init];
        [self presentViewController: secondVC animated:YES completion: nil];

    


-(void)loginButtonDidLogOut:(FBSDKLoginButton *)loginButton

【问题讨论】：

它询问电子邮件，朋友和个人资料的信息，它变得更好。它仍然返回到 MainViewController 页面......我希望它跳转到 AnotherViewController。谢谢你仍然大卫:)

【参考方案1】：

我现在找到了问题所在。因为我在我的 .m 文件中声明了另一个新的 FBButton，并且我将它（在本例中为 loginBtn）设置为委托。相反，我应该设置我在 .h 文件中声明的 FBButton

self.FBButton.delegate = self; 

这解决了问题。希望这能有所帮助。