如何在MessageComposer中粘贴Image

Question

我已将图像作为数据复制到UIPasteboard，我需要将此图像自动粘贴到Message Compose，而无需用户交互。怎么做？

NSData *imageData = UIImagePNGRepresentation(image1);
UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
[pasteboard setData:imageData forPasteboardType:@"public.png"];