Facebook与SLComposeViewController共享：在没有互联网可用时阻止完成处理程序

问题描述：

我在我的应用程序（iOS6）中实现了Facebook共享，代码如下。

I have implemented Facebook sharing in my app (iOS6) and the code is as follows.

//完成处理程序

SLComposeViewControllerCompletionHandler __block completionHandler = ^(SLComposeViewControllerResult result) {
    UIAlertView *alert = nil;
    switch(result) {
        case SLComposeViewControllerResultCancelled: {
            alert = [UIAlertView alloc]initWithTitle:@"Cancelled" message:@"Your message wasn't shared" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            [alert show];
        }
        break;
        case SLComposeViewControllerResultDone: {
            alert = [UIAlertView alloc]initWithTitle:@"Posted" message:@"Your message was posted successfully" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            [alert show];
        }
        break;
    }
}

//发布到Facebook

// Posting to Facebook

if([SLComposeViewController isAvailableForServiceType:SLServiceTypeFacebook]) {
    SLComposeViewController *fbVC = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeFacebook];
    fbVC.completionHandler = completionHandler;
    [self presentViewController:fbVC animated:YES completion:nil];
}

我正在测试以下情况：

互联网可用，用户输入文字并按下帖子

互联网可用，用户输入文字并按下取消

互联网不可用，用户输入文字并按下帖子。

前两个工作正常。在第三种情况下，正如预期的那样，我得到提醒

First two works as they should. In the third situation, as expected, I get alert

"Cannot Post to Facebook" - The post cannot be sent because connection to Facebook failed.

但是在我提交给我的警报视图中按下再试一次或取消按钮后，我获取已发布警报（完成处理程序类型SLComposeViewControllerResultDone被执行）。

But after I press either Try Again or Cancel button in the alert view that was presented to me, I get "Posted" alert (the completion handler type SLComposeViewControllerResultDone gets executed).

如何防止这种情况？

答

编辑：$ b $嗯，解决第三种情况很简单。我添加了Apple提供的可访问性类（可下载此处。）只需要的代码如下：

Well, it was simple to fix the third situation. I added the reachability class provided by Apple (available for download here.) Only code that was required is as follows:

#import "Reachability.h"

- (BOOL)internetConnected {
    Reachability *reachability = [Reachability reachabilityForInternetConnection];
    NetworkStatus networkStatus = [reachability currentReachabilityStatus];
    return !(networkStatus == NotReachable || reachability.connectionRequired); //required for iOS 7 and above
}

... 
...

case SLComposeViewControllerResultDone: {
    if(self.internetConnected) {
        alert = [UIAlertView alloc]initWithTitle:@"Posted" message:@"Your message was posted successfully" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
    } else {
        alert = [UIAlertView alloc]initWithTitle:@"Failed" message:@"Your message was not posted, no internet was available" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
    }
break;

Facebook与SLComposeViewController共享：在没有互联网可用时阻止完成处理程序

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