javaoraspx

添加上面代码可以解决 但是要注意,如果该VC没有load,但是已添加到 nav 中 则需要判断 `backgroundImageBlock` 等block是否已赋值; ``` - (UIImage *)navigationBarBackgroundImage { if(self.navigationAnimator.backgroundImageBlock){ return self.navigationAnimator.backgroundImageBlock(self.navigationAnimator, self.navigationAnimator.progress); } return NavBarBackgroundImage; } ```