UIActivityViewController

    //UIImage *imageToShare = [UIImage imageNamed:@"iosshare.jpg"];
    //NSURL *urlToShare = [NSURL URLWithString:@"http://blog.csdn.net/hitwhylz"];
    NSString *textToShare = self.textView.text;
    NSArray *activityItems = @[textToShare];
    UIActivityViewController *activity = [[UIActivityViewController alloc] initWithActivityItems:activityItems applicationActivities:nil];

    activity.excludedActivityTypes = @[UIActivityTypeAirDrop];//要忽略的内容

    /* //ipad使用
     UIPopoverPresentationController *popover = activity.popoverPresentationController;
    if (popover) {
        popover.sourceView = self.activityButton;
        popover.permittedArrowDirections = UIPopoverArrowDirectionUp;
    }
     */

    [self presentViewController:activity animated:YES completion:nil];