     }
 
     private var buttonPosition: QMUINavigationButtonPosition = .none
-
-    private func renderButtonStyle() {
-    }
 }
 
 /**

        fatalError("init(coder:) has not been implemented")
    }

    private func didInitialized() {
        // TODO: -
    }
}

/**
 *  用于 `QMUIGhostButton.cornerRadius` 属性，当 `cornerRadius` 为 `QMUIGhostButtonCornerRadiusAdjustsBounds` 时，`QMUIGhostButton` 会在高度变化时自动调整 `cornerRadius`，使其始终保持为高度的 1/2。
 */
public let QMUIGhostButtonCornerRadiusAdjustsBounds = -1

/**
 *  “幽灵”按钮，也即背景透明、带圆角边框的按钮

            if valueDifference {
                self.updateImageRenderingModeIfNeeded()
            }
        }
    }
    
    /**
     *  等价于 adjustsTitleTintColorAutomatically = YES & adjustsImageTintColorAutomatically = YES & tintColor = xxx
     *  @note 一般只使用这个属性的 setter，而 getter 永远返回 self.tintColor
     *  @warning 不支持传 nil
     */
    @IBInspectable var tintColorAdjustsTitleAndImage: UIColor {
        set {
            tintColor = tintColorAdjustsTitleAndImage
            adjustsTitleTintColorAutomatically = true
            adjustsImageTintColorAutomatically = true
        }
        
        get {
            return tintColor
        }
    }

