how do I remove the curtain opening effect with uiimagepickercontroller

when I do

[self presentModalViewController:picker animated:NO];

there would开发者_如何学Python be always a "8 pieces of blade opening and then the preview shows" kind of effect. my questions is how do i skip the balde opening part and jump right to the preview? is there a way to do that?

also can i hold/resume preview programmatically?

You'd need to "build your own" using Apple's AV Foundation framework.

It is entirely possible, but likely a lot more work than you want to do :) if you're just taking a picture. For an advanced photo/movie app, though, it's more flexible than UIImagePickerController.