[Solved] How to programmatically enter a password inside a password protected PDF file?

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I found the answer I was looking for on this apple site.
Here is how I managed to get it work:

  1. first you transform the filepath string into NSURL(and make CFURL of that) like this: 

    let path : NSString = filepath as NSString        
let thePath = path.stringByExpandingTildeInPath   
let url = NSURL.fileURLWithPath(thePath)   
let CFUrl = url as CFURL

  2. You import CoreGraphics and CoreFoundation and then make a document like this:

    var document : CGPDFDocumentRef = CGPDFDocumentCreateWithURL(CFUrl)

  3. Now you can use the CoreGraphics methods to check if it is unlocked or not and to enter a password like this:

    if CGPDFDocumentIsUnlocked(document) {
    //true if there is NO password   
}    
if CGPDFDocumentUnlockWithPassword(document, "password here") {      
    //returns true if the password is correct   
}

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solved How to programmatically enter a password inside a password protected PDF file?