[置顶] iOS中如何修改系统自带的导航栏的颜色

#define RGBACOLOR(r, g, b, a)   [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:(a)]

self.navigationController.navigationBar.barTintColor=RGBACOLOR(139, 208, 191, 1);