``/**< 返回item颜色 */``

``[self.navigationController.navigationBarsetTintColor:[UIColorwhiteColor]];``

``/**< 导航栏背景 */``

``[self.navigationController.navigationBarsetBackgroundImage:[UIImageimageNamed:@"navigationImage.png"]forBarMetrics:UIBarMetricsDefault];``

``/**< 导航栏透明度 */``

``[self.navigationController.navigationBar.barStyle=UIBarStyleBlackTranslucent;[self.navigationController.navigationBarsetBackgroundImage:[UIImageimageNamed:@"o+x"] forBarMetrics:UIBarMetricsCompact];``

``/** < 不加会有横线*/``

``[self.navigationController.navigationBarsetValue:@(0)forKeyPath:@"backgroundView.alpha"]; self.navigationController.navigationBar.barStyle=UIBarStyleBlackTranslucent;``

``/**< 修改字体颜色及字体大小 */``

``[self.navigationController.navigationBar.titleTextAttributes=@{NSForegroundColorAttributeName:[UIColorwhiteColor],NSFontAttributeName:[UIFontboldSystemFontOfSize:17]};``

``// 设置导航栏透明``

``- (void)viewWillAppear:(BOOL)animated``

``{``

``    [super viewWillAppear:animated];``

``    [self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];``

``    [self.navigationController.navigationBar setShadowImage:[UIImage new]];``

``}``

``- (void)viewWillDisappear:(BOOL)animated``

``{``

``    [super viewWillDisappear:animated];``

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

``    [self.navigationController.navigationBar setShadowImage:nil];``

``}``