ios - 错误 "No known class method for selector ' 可以发送推文'

Question

我正在尝试设置推文按钮。我的所有代码似乎都在工作，除了它给我错误“选择器‘canSendTweet’没有已知的类方法”有什么建议吗？

- (IBAction)tweetTapped:(id)sender
{
//Check if the device can send tweets
if ([SLComposeViewController canSendTweet])
{
    //Create tweet sheet and set initial text
   SLComposeViewController *tweetSheet =
    [[SLComposeViewController alloc] init];
    [tweetSheet setInitialText:@"this is a tweet from my app"];
    [tweetSheet addURL:[NSURL URLWithString:@"http://www.iosdeveloperguide.com"]];

    //show tweet sheet
    [self presentViewController:tweetSheet animated:YES completion:nil];
}
else
{
    //Device can not tweet. Show error Notification.
    UIAlertView *alertview = [[UIAlertView alloc]
                              initWithTitle:@"Unable to Tweet"
                              message:@"Please ensure that you have at least one Twitter account setup and have internet connectivity"
                              delegate:self
                              cancelButtonTitle:@"OK"
                              otherButtonTitles:nil];
    [alertview show];

}

}


 @end

Answer 1

SLComposeViewController 类没有名为canSendTweet 的类方法。快速浏览一下引用文档(您应该这样做)，您会发现您想要的是:

if ([SLComposeViewController isAvailableForServiceType:SLServiceTypeTwitter]) {
    // can send a tweet
}