ios - Open camera roll on an exact photo -

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I am developing a camera application where I would like to do some things that already exist in the stock app. My problem is copying the small square (in portrait mode) in the bottom left corner, where the microphone thumbnail is shown where the user has taken the picture yet; Then, when the user taps on it, to open the photo app, on the last photo saved in the camera roll.

I can load a thumbnail of the latest photos in the camera roll with the Alzacet Library - access it with I [UIImage imageWithCGImage: [Threads thumbnail]] - but even here I can not open the photo app even though I have its alassette URL. I am trying to do this with: 

  [[UIApplication shared application] openURL: result.defaultRepresentation.url];   
 But nothing happens.  
 With an extra UIView, I can display it internally in my app, but I think it's simple and ... official photo app!  
 Can anyone help me? Thank you in advance!   
 
 
 You may want to use UIImagePickerController, as here:  < / Div>

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