Question

我对fb mobile api有一个奇怪的问题。我正在使用最新的git版本。

在我的应用中，用户可以在应用启动时登录Facebook。如果用户没有有效会话（例如，未登录，使用用户默认值中加载的FBCredentials进行检查），则会调用facebook授权代码。用户登录，然后返回我的应用程序（新令牌+用户默认保存的时间）。在那之后，我打电话给一个简单/我的请求。我从facebook上获取数据，一切都很好。

但是现在接下来是：用户关闭应用程序（仍然登录）。用户重新打开应用程序。我的应用程序检查用户是否具有有效会话（再次使用用户默认值中加载的FBCredentials进行检查），并返回YES（这就是我所期望的）。但是这一次，登录/启动应用程序后立即调用api会返回任何内容！所有进一步的api调用都没有返回。

如果用户在应用程序中注销（[facebook logout：self];）然后再次登录，则api调用正在运行。因此，我假设我的代码无法在应用启动时使用加载凭据。

继承我的控制器，负责fb连接。

//
//  FacebookController.h
//

#import <Foundation/Foundation.h>

#import "FBConnect.h"

@interface FacebookController : NSObject <FBRequestDelegate, FBSessionDelegate> {
    Facebook *facebook;
    NSArray *permissions;

}

@property(nonatomic, retain) Facebook *facebook;

+ (FacebookController *)instance;
- (void)loginToFacebook;
- (void)loggedIn;
- (void)logoutOfFacebook;

@end

实施：

//
//  FacebookController.m
//

#import "FacebookController.h"
#import "MyAppAppDelegate.h"

static NSString* FBAppId = @"...";

@interface FacebookController()

    - (void)loadFBCredentials;
    - (void)saveFBCredentials;

@end


@implementation FacebookController

@synthesize facebook;

+ (FacebookController *)instance {
    static FacebookController *instance = nil;
    if (!instance) {
        instance = [[FacebookController alloc] init];
    }
    return instance;
}

- (id)init {
    self = [super init];
    if (!facebook) {
        facebook = [[Facebook alloc] initWithAppId:FBAppId];
        [self loadFBCredentials];
    }
    return self;
}

// Show the authorization dialog.
- (void)loginToFacebook {
    if (![facebook isSessionValid]) {
        [facebook authorize:permissions delegate:self];
    } else {
        [self loggedIn];
    }
}

// Show the authorization dialog.
- (void)logoutOfFacebook {
    [facebook logout:self];
}

- (void)loggedIn {
    // Api call.
    [facebook requestWithGraphPath:@"/me" andDelegate:self];
}

// Called when the user has logged in successfully.
- (void)fbDidLogin {
    // Save Credentials.
    [self saveFBCredentials];
    [self loggedIn];
}

- (void)request:(FBRequest *)request didReceiveResponse:(NSURLResponse *)response {

}

- (void)request:(FBRequest *)request didFailWithError:(NSError *)error {

}

- (void)request:(FBRequest *)request didLoad:(id)result {
    NSLog(@"Got request");
    if ([result isKindOfClass:[NSDictionary class]]) {
        NSLog(@"count : %d ", [result count]);
        NSArray* resultArray = [result allObjects];

        NSLog(@"count : %d ", [result count]);
        result = [resultArray objectAtIndex:0];
    }
}

// Called when the request logout has succeeded.
- (void)fbDidLogout {   
    [self saveFBCredentials];

    [(MyAppAppDelegate *)[UIApplication sharedApplication].delegate showModalLoginView:YES]; 
}

- (void)loadFBCredentials {
    NSLog(@"Loading.");
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    if ([defaults objectForKey:@"FBAccessTokenKey"] 
        && [defaults objectForKey:@"FBExpirationDateKey"]) {
        facebook.accessToken = [defaults objectForKey:@"FBAccessTokenKey"];
        facebook.expirationDate = (NSDate *) [defaults objectForKey:@"FBExpirationDateKey"];
    }
}

- (void)saveFBCredentials {
    NSLog(@"Saving.");
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setObject:[facebook accessToken] forKey:@"FBAccessTokenKey"];
    [defaults setObject:[facebook expirationDate] forKey:@"FBExpirationDateKey"];
    [defaults synchronize];
}

- (void)dealloc {
    [facebook release];
    [super dealloc];
}

@end

Answer 1

请求offline_access权限并使用生成的访问令牌密钥以避免会话无效的情况。

Facebook iOS Api调用在relogin上失败，但isSessionValid为YES

1 个答案: