1. 只有電池欄顏色變化 而且 沒有導航欄那條橫線

 UIView *statusBarView = [[UIView alloc] initWithFrame:CGRectMake(0, -20, kScreenWidth, 20)];
    
        statusBarView.backgroundColor = kBackgroundColor;
    
        [self.navigationController.navigationBar addSubview:statusBarView];

    
        [self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
        //消除陰影
        self.navigationController.navigationBar.shadowImage = [UIImage new];

2. 導航欄字體大小和顏色

 [self.navigationController.navigationBar setTitleTextAttributes:
     
     @{NSFontAttributeName:[UIFont systemFontOfSize:15],
       
       NSForegroundColorAttributeName:[UIColor whiteColor]}];

設置狀態(tài)欄和導航欄是一致的顏色

self.navigationController.navigationBar.barTintColor = kBackgroundColor;

self.navigationController.navigationBar.translucent = NO;

設置透明的導航欄

 - (void)viewWillAppear:(BOOL)animated {

    [super viewWillAppear:animated];

    UIImage *image = [[UIImage alloc] init];

    //設置導航欄背景圖片為一個空的image，這樣就透明了

    [self.navigationController.navigationBar setBackgroundImage:image forBarMetrics:UIBarMetricsDefault];

    //去掉透明后導航欄下邊的黑邊

    [self.navigationController.navigationBar setShadowImage:image];

    self.navigationController.navigationBar.barStyle = UIBarStyleBlack;

    self.navigationController.navigationBar.translucent = YES;

}


 - (void)viewWillDisappear:(BOOL)animated {

    [super viewWillDisappear:animated];

    [self.navigationController.navigationBar setBackgroundImage:nil forBarMetrics:UIBarMetricsDefault];

    [self.navigationController.navigationBar setShadowImage:nil];

    self.navigationController.navigationBar.barStyle = UIBarStyleDefault;

    self.navigationController.navigationBar.translucent = NO;

}