iphone - 使用 UIActivityViewController 感到困惑

Question

你能帮我理解什么时候应该使用UIActivityViewController。我有一个按钮，用于共享有关我的应用程序的常见信息(例如带有链接和图像的“我喜欢这个应用程序”)。我的旧代码是:

NSMutableDictionary *params = [NSMutableDictionary dictionary];
[params setObject:picture forKey:@"picture"];
[params setObject:link forKey:@"link"];
[params setObject:@"I like MY app!" forKey:@"caption"];
[params setObject:@"I am now using MY iPhone app." forKey:@"description"];
[params setObject:linkToTheIcon forKey:@"icon"];
[params setObject:@"including link" forKey:@"type"];
[[FacebookConnection instance] feedLink:params andDelegate:self];

现在我想使用 UIActivityViewController 但我有点困惑如何将所有这些参数传递给它。或者我应该以其他方式做事？

添加:所以我明白我需要静默发布程序。您能否指导我使用 iOS 6 功能(例如使用内置 FB 帐户)完成静默发布过程。目前我不明白如何检查设备上是否存在FB帐户，如果不存在如何提示创建它？ ACAccount存储类中有一个方法 - requestAccessToAccountsWithType:options:completion: 来访问帐户。但如果帐户不存在，则会返回错误。非常感谢。

Answer 1

在您的情况下，很明显您不应该使用 UIActivityViewController 因为您想在 Facebook 上发帖，而不是在 Twitter 或其他任何地方发帖，对吗？首先，您需要访问用户帐户。你这样做:

-(void)requestBasicPermissionsForFacebookAccount {
    ACAccountType * facebookAccountType = [self.accountStore accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierFacebook];
    NSArray * permissions = @[@"email"];
    NSDictionary * options = @{ACFacebookAppIdKey : kFacebookAppId, ACFacebookPermissionsKey : permissions, ACFacebookAudienceKey : ACFacebookAudienceEveryone};
    FacebookAccountManager * fbMgr = [[FacebookAccountManager alloc] init];
    [self.accountStore requestAccessToAccountsWithType:facebookAccountType options:options completion:^(BOOL granted, NSError *error) {
        if (granted) {
            NSArray * accounts = [self.accountStore accountsWithAccountType:facebookAccountType];
            fbMgr.account = [accounts lastObject];
            fbMgr.isBasicPermissionsGranted = YES;
            [self.accountManagers addObject:fbMgr];
            NSLog(@"granted!");
        }
        else {
            fbMgr.account = nil;
            fbMgr.isBasicPermissionsGranted = NO;
            switch ([error code]) {
                case 1:
                    [self showErrorAlertWithMessage:@"Unknown error occured, try again later!"];
                    break;
                case 3:
                    [self showErrorAlertWithMessage:@"Authentication failed, try again later!"];
                     break;
                case 6:
                    [self showErrorAlertWithMessage:@"Facebook account does not exists. Please create it in Settings and come back!"];
                     break;
                 case 7:
                    [self showErrorAlertWithMessage:@"Permission request failed. You won't be able to share information to Facebook"];
                     break;
                default:
                    break;
            }
            NSLog(@"error is: %@", error);
        }
    }];
}

如果帐户不存在，您应该提示用户在设置中创建它，然后尝试再次获取基本权限。