[self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage = [UIImage new];
self.navigationController.navigationBar.translucent = YES;
[self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor blackColor],NSFontAttributeName:[UIFont systemFontOfSize:19.0]}]; // 字体设置
self.navigationController.navigationBar.tintColor = ColorGreen;
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"nav_masterBackButton"] style:UIBarButtonItemStylePlain target:self action:@selector(popSelfVC)];
原文：http://www.cnblogs.com/Milo-CTO/p/4415114.html