 }
 
 extension Drop {
-    private class func window() -> UIWindow {
-        return UIApplication.sharedApplication().keyWindow!
-    }
-    
     private class func statusBarHeight() -> CGFloat {
         return UIApplication.sharedApplication().statusBarFrame.size.height
     }

    }
    
    public class func upAll() {
        for view in Drop.window().subviews {
            if let drop = view as? Drop {
                drop.up()
            }

            item: drop,
            attribute: .Top,
            relatedBy: .Equal,
            toItem: window,
            attribute: .Top,
            multiplier: 1.0,
            constant: -drop.heightConstraint.constant
        )
        
        window.addConstraints(sideConstraints)
        window.addConstraint(drop.topConstraint)
        drop.setup(status, state: state, blur: blur)
        drop.updateHeight()
        
