UIActivityViewController一个集装箱内查看(UIActivityViewCon

我用一个容器视图内UIActivityViewController。我想通过电子邮件，Twitter和Facebook分享一些文字。而最后两部作品完美我有电子邮件问题。问题是，作曲家观点不无论是取消该事件也不由要发送解聘！当ActivityView出现我得到以下信息：

Launch Services: Registering unknown app identifier com.apple.mobilemail failed 
Launch Services: Unable to find app identifier com.apple.mobilemail

这就奇怪了，因为真的是有与应用程序标识没有问题，我可以分享与电子邮件文本，在其他视图控制器使用ActivityViewController（不用时容器视图）。我的代码，如下：

- (void)openBtnTouched {
    NSString *alertTitleString = [[[GlobalVariables sharedInstance].alertsArray objectAtIndex:self.selectedIndex]objectForKey:@"alertTitle"];
    NSString *alertMsgString = [[[GlobalVariables sharedInstance].alertsArray objectAtIndex:self.selectedIndex]objectForKey:@"alertMessage"];

    UIActivityViewController *activity;

    activity = [[UIActivityViewController alloc] initWithActivityItems:@[alertTitleString,alertMsgString] applicationActivities:nil];

    activity.excludedActivityTypes = @[
                                       UIActivityTypeMessage,
                                       UIActivityTypePostToWeibo,
                                       UIActivityTypeSaveToCameraRoll,
                                       UIActivityTypeAssignToContact,UIActivityTypeCopyToPasteboard];

    activity.completionHandler = ^(NSString *activityType, BOOL completed){
        NSLog(@"Activity Type selected: %@", activityType);
        if (completed) {
            NSLog(@"Selected activity was performed.");
        } else {
            if (activityType == NULL) {
                NSLog(@"User dismissed the view controller without making a selection.");
            } else {
                NSLog(@"Activity was not performed.");
            }
        }
    };
    [self presentViewController:activity animated:YES completion:NULL];
}

我不知道您的应用程序是否适用于iPhone，iPad的，或两者兼而有之，但苹果是非常具体的关于如何显示UIActivityViewController 。从他们的文档：