iphone - 如何判断ios用户是否登录了twitter？

Question

我想确定用户是否登录了 twitter，所以我可以提示他们发布推文，但前提是他们设置了 ios 和 twitter。另外，有没有办法用默认推文设置推特屏幕？

Answer 1

对于 iOS 5.x，您可以使用以下命令检查用户是否已登录 twitter：

[TWTweetComposeViewController canSendTweet]

至于显示带有默认消息的推文屏幕，您可以执行以下操作：

TWTweetComposeViewController *tweetSheet = [[TWTweetComposeViewController alloc] init];
[tweetSheet setInitialText:defaultMsg];
[self presentModalViewController:tweetSheet animated:YES];

您可以参考本教程了解更多信息。

编辑：对于iOS 6.0及以上，使用：

// requires "Social.framework"
[SLComposeViewController isAvailableForServiceType:SLServiceTypeTwitter]

因此，一个示例用法可能是：

if([SLComposeViewController isAvailableForServiceType:SLServiceTypeTwitter])
    {
        SLComposeViewController *controller = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeTwitter];

        SLComposeViewControllerCompletionHandler myBlock = ^(SLComposeViewControllerResult result){
            [controller dismissViewControllerAnimated:YES completion:Nil];
        };
        controller.completionHandler = myBlock;
        [controller setInitialText:@"#myHashTag"];
        [controller addImage:myImage];
        [self presentViewController:controller animated:YES completion:Nil];
    }
    else
    { /* Show error alert, etc*/ }

进一步阅读

Answer 2

正如我在评论中所说，如果您使用的是 IOS 5 或更高版本，只需添加Twitter.framework到您的项目中即可

#import <Twitter/Twitter.h>

//post tweets
- (IBAction)postTapped:(id)sender{

    if ([TWTweetComposeViewController canSendTweet])
    {
        TWTweetComposeViewController *tweetSheet = [[TWTweetComposeViewController alloc] init];
        [tweetSheet setInitialText:@" #hashtag"];


        [self presentModalViewController:tweetSheet animated:YES];
    }
    else
    {

        TWTweetComposeViewController *viewController = [[TWTweetComposeViewController alloc] init];

        //hide the tweet screen
        viewController.view.hidden = YES;

        //fire tweetComposeView to show "No Twitter Accounts" alert view on iOS5.1
        viewController.completionHandler = ^(TWTweetComposeViewControllerResult result) {
            if (result == TWTweetComposeViewControllerResultCancelled) {
                [self dismissModalViewControllerAnimated:NO];
            }
        };
        [self presentModalViewController:viewController animated:NO];

        //hide the keyboard
        [viewController.view endEditing:YES];
    }


}