UIImage *shareImage = [UIImage imageNamed:@"myImage.png"];

        // Init array
        NSMutableArray *items = [NSMutableArray new];
        [items addObject:@""];
        [items addObject:shareImage];

        // Add image to paste board
        UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
        pasteboard.persistent = YES;
        pasteboard.image = shareImage;

        UIActivityViewController *activityVC = [[UIActivityViewController alloc]initWithActivityItems:items applicationActivities:nil];

        //This is an array of excluded activities to appear on the UIActivityViewController
        activityVC.excludedActivityTypes = @[UIActivityTypePostToWeibo,UIActivityTypePrint,UIActivityTypeCopyToPasteboard,UIActivityTypeAssignToContact,UIActivityTypeSaveToCameraRoll];

        [self presentViewController:activityVC animated:TRUE completion:nil];

一切正常但无法将shareImage粘贴到iMessage.我不知道为什么？
谢谢您帮忙！