 
 	private var button: NBButton?
 
+	@available(*, unavailable, message="")
 	@IBOutlet weak var loadingImageView: UIImageView! {
 		didSet {
-			loadingImageView.hidden = true
-		}
-	}
+//			loadingImageView.hidden = true
+		}
+	}
+	@available(*, unavailable, message="")
 	@IBOutlet weak var promptLabel: UILabel! {
 		didSet {
-			promptLabel.hidden = false
+//			promptLabel.hidden = false
 		}
 	}
 
 	// MARK: Stored Properties
+
+
 
 	/// a flag indicates if is loading more
 	var isLoadingMore: Bool = false

					(superview as! UIScrollView).contentInset = originalInset
					}, completion: { (finished) -> Void in
						self.isLoadingMore = false
						self.promptLabel.hidden = false
						self.loadingImageView.stopAnimating()
						self.loadingImageView.hidden = true
						self.loadingImageView.animationImages = nil
				})
			}
		}

			let contentOffset = (superview as! UITableView).contentOffset
			self.alpha = (contentOffset.y + (superview as! UIScrollView).height - (superview as! UIScrollView).contentSize.height - alphaAnimationOffset) / self.height
			if self.alpha < 1.0 {
//				self.promptLabel.text = "上拉加载"
			} else {
//				self.promptLabel.text = "松开加载"
			}
			break
		case &UIScrollViewContentSizeContext:
