PresentViewController from custom TableCell in xib

TableViewCell is a view, you can not present on views instead UIViewController can handle it. You should transfer the control from your cell to your controller that holds tableview and creates custom cell for it.

Try like this:

Custom Cell .h Class:

@protocol changePictureProtocol <NSObject>
-(void)loadNewScreen:(UIViewController *)controller;
@end

@property (nonatomic, retain) id<changePictureProtocol> delegate;

Then Synthesize it in.m.

Add this in m file:

-(IBAction)changePicture:(id)sender
{
    // ..... blah blah
    [self.delegate loadNewScreen:picker];
}

The viewcontroller that loads this cell:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
   // create cell here

   cell.delegate = self;
}

-(void)loadNewScreen:(UIViewController *)controller;
{
  [self presentViewController:controller animated:YES completion:nil];
}

Its a psuedocode to give you an idea.

EDIT:

Swift equivalent:

CustomTableViewCell.swift code:

protocol ChangePictureProtocol : NSObjectProtocol { 
    func loadNewScreen(controller: UIViewController) -> Void;  
}

class CustomTableViewCell: UITableViewCell {

    // Rest of the class stuff

    weak var delegate: ChangePictureProtocol?

    @IBAction func changePicture(sender: AnyObject)->Void
    {
        var pickerVC = UIImagePickerController();
        if((delegate?.respondsToSelector("loadNewScreen:")) != nil)
        {
           delegate?.loadNewScreen(pickerVC);
        }  
    }
}

ViewController.swift code:

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
    var cell = tableView.dequeueReusableCellWithIdentifier("cellIdentifier") as CustomTableViewCell!

    cell.delegate = self;

    return cell;
}

func loadNewScreen(controller: UIViewController) {
    self.presentViewController(controller, animated: true) { () -> Void in

    };
}