以支付宝为例!

[self.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];

[self.navigationBar setShadowImage:[[UIImage alloc] init]];

以上两句话一起,可以将系统的导航栏设置为透明的颜色.如下图-1,相比较常见的系统导航栏,不见了64的那部分内容!---以方便实现支付宝那种偏黑的效果.

图-1

//设置bar的tintColor  

[self.navigationBar setBarTintColor:[UIColor colorWithHex:0x3a3a3a]];

self.navigationBar.translucent = NO;

实现效果如图-2,  其导航栏的背景色类似于黑色.

图-2

//设置所有使用这个导航控制器的vc标题都是白色的  具体内容在navigationController对应的rootViewController中设置

[self.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor whiteColor]}];

//修改bar的tintColor  也就是各个item的颜色  如返回等.

[self.navigationBar setTintColor:[UIColor whiteColor]];

具体实现效果如图-3.

图-3

************关于是否显示TarBar的方法.

// push控制器的时候调用

- (void)pushViewController:(UIViewController*)viewController animated:(BOOL)animated

{

if (self.viewControllers.count > 0) {

// 只要push控制器 就要隐藏tabbar

viewController.hidesBottomBarWhenPushed = YES;

}

[super pushViewController:viewController animated:animated];

}

苹果API文档,关于UIviewController 和UINavigationController的关系,提供一点思路

@interface UIViewController (UINavigationControllerItem)

@property(nonatomic,readonly,strong) UINavigationItem *navigationItem; // Created on-demand so that a view controller may customize its navigation appearance.

@property(nonatomic) BOOL hidesBottomBarWhenPushed __TVOS_PROHIBITED; // If YES, then when this view controller is pushed into a controller hierarchy with a bottom bar (like a tab bar), the bottom bar will slide out. Default is NO.

@property(nullable, nonatomic,readonly,strong) UINavigationController *navigationController; // If this view controller has been pushed onto a navigation controller, return it.

@end