问题
I notice that Mobile Safari's Twitter and Facebook share adds a screenshot of the current page without actually sharing it, eg:
Im trying to duplicate this via SLComposeViewController, however calling the addImage: actually adds the UIImage to the tweet/facebook album (as expected).
Is there a way to just display the screenshot of the page without adding the image ?
Edit: Looks like SLComposeViewController conforms to UIAppearanceContainer however the UI_APPEARANCE_SELECTOR is not documented.
回答1:
Safari is previewing the screenshot to the website because it has it loaded and ready in on the screen, when you addURL: on the SLComposeViewController it doesn't resolve that URL and grab a preview.
Also when you addImage: that's exactly what it's doing, it's adding an image to your post, this isn't what you want, you just want to have a visual and not a safari logo/icon in place of the attachment indicating a link.
I can only say there is a private method on the SLComposeViewController class which is how Safari is adding a preview image for URLs added...
You should always get this in your app when sharing a URL:
That sucks, you should add a feature request (http://bugreport.apple.com) so that you can add your own preview here, maybe Apple will make that public in future iOS releases.
来源：https://stackoverflow.com/questions/13239957/slcomposeviewcontroller-with-screenshot-but-not-image-attachment