苹果的UIActivityViewController

Question

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NSString *postText = @"My Text";
    NSArray *activityItems = @[postText];
    UIActivityViewController *activityController =
    [[UIActivityViewController alloc]
     initWithActivityItems:activityItems applicationActivities:nil];
    activityController.excludedActivityTypes = www.xsxs.net[NSArray arrayWithObjects:UIActivityTypePrint, UIActivityTypeCopyToPasteboard, UIActivityTypeAssignToContact, UIActivityTypeSaveToCameraRoll, nil];
    [self presentViewController:activityController
                       animated:YES completion:nil];
是什么意思呢

Answer 1

应用中用到 UIActivityViewController 

Answer 2

代码没问题，但是我觉得，是否把alertmessage的判断放到done = success里，是不是代码更优化些