Question

我有一个View Controller，可以从我的facebook帮助器中实现一些委托方法。当点击一些图标（如图标）时，我的应用程序切换到Facebook移动网络登录。之后，它切换回我的应用程序，但是，该应用程序需要更多的写入权限，因此Facebook移动网络（safari）再次切换。我按OK然后完成操作。但是，我的View Controller中的委托方法未被调用。我调试并且可以看到当时facebook动作发生，变量“delegate”为零。我的视图控制器有一些特别之处每次从背景返回时，它会呈现另一个视图控制器（用于赞助商屏幕）。显示持续时间约为3秒，然后赞助商屏幕消失。
如何调用委托方法？
在我看来控制器
[FacebookHelper sharedInstance].fbDelegate = self; [[FacebookHelper sharedInstance] likeCommentFacebook:!isLike withCommentID:message.messageID];
在我的facebook帮手：
` - （void）likeCommentFacebook：（BOOL）isLike withCommentID：（NSString *）commentID {

//- check if we are already processed by the loginCallback
if (_loginCallbackInvocation == nil) {
    //- create NSInvocation reference to this method
    NSInvocation * nsi = [WKTools invocationWithTarget:self selector:_cmd retainArguments:TRUE argumentAddresses:&isLike, &commentID];
    //- ensure user has been properly identified and process with authentication if required
    [self processLogin:nsi];
}

//- check if user session is valid
if ([[FBSession activeSession] isOpen]) {
    if (![self hasPermission:kPublishStream]) {
        NSArray *permissions = [NSArray arrayWithObjects: kPublishStream,nil];
        dispatch_async(dispatch_get_current_queue(), ^{
            [FBSession.activeSession requestNewPublishPermissions:permissions defaultAudience:FBSessionDefaultAudienceEveryone completionHandler:^(FBSession *session, NSError *error) {
                NSString *requestUrl = [NSString stringWithFormat:@"%@%@", commentID,FB_REQUEST_LIKE];
                NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"", MESSAGE_KEY, nil];
                //- send request
                if (isLike == YES) {
                    [self requestGraphAPI:requestUrl parameter:params httpMethod:POST_METHOD];
                } else {
                    [self requestGraphAPI:requestUrl parameter:params httpMethod:DELETE_METHOD];
                }
            }];
        });
    } else {
        NSString *requestUrl = [NSString stringWithFormat:@"%@%@", commentID,FB_REQUEST_LIKE];
        NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"", MESSAGE_KEY, nil];
        //- send request
        if (isLike == YES) {
            [self requestGraphAPI:requestUrl parameter:params httpMethod:POST_METHOD];
        } else {
            [self requestGraphAPI:requestUrl parameter:params httpMethod:DELETE_METHOD];
        }
    }
} else {
    if ([self isSessionCachedAndLoaded]) {
        [FBSession.activeSession openWithCompletionHandler:^(FBSession *session, FBSessionState status, NSError *error) {
            if (![self hasPermission:kPublishStream]) {
                [[NSUserDefaults standardUserDefaults] synchronize];
                NSArray *permissions = [NSArray arrayWithObjects: kPublishStream,nil];
                dispatch_async(dispatch_get_current_queue(), ^{
                    [FBSession.activeSession requestNewPublishPermissions:permissions defaultAudience:FBSessionDefaultAudienceEveryone completionHandler:^(FBSession *session, NSError *error) {
                        NSString *requestUrl = [NSString stringWithFormat:@"%@%@", commentID,FB_REQUEST_LIKE];
                        NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"", MESSAGE_KEY, nil];
                        DEBUGLog(@"like comment: %@",requestUrl);

                        //- send request
                        if (isLike == YES) {
                            [self requestGraphAPI:requestUrl parameter:params httpMethod:POST_METHOD];
                        } else {
                            [self requestGraphAPI:requestUrl parameter:params httpMethod:DELETE_METHOD];
                        }
                    }];
                });
            } else {
                NSString *requestUrl = [NSString stringWithFormat:@"%@%@", commentID,FB_REQUEST_LIKE];
                NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"", MESSAGE_KEY, nil];
                //- send request
                if (isLike == YES) {
                    [self requestGraphAPI:requestUrl parameter:params httpMethod:POST_METHOD];
                } else {
                    [self requestGraphAPI:requestUrl parameter:params httpMethod:DELETE_METHOD];
                }
            }
        }];
    }
}

}`

和回调方法

if (self.fbDelegate && [self.fbDelegate respondsToSelector:@selector(likeCommentDidSuccess:)]) { [self.fbDelegate performSelector:@selector(likeCommentDidSuccess:) withObject:dictionary]; }

Answer 1

是否已将delegate设置为self中的ViewController，并在yourViewController的.h文件中提及/实施了该代理，如下所示。

<强> yourViewController.h

@interface yourViewController : UIViewController<yourDelegate>

<强> yourViewController.m

[yourComponent setYourDelegate:self];

委托隐藏时未调用的方法

1 个答案: