//设置导航标题
self.title = @"首页";
//设置导航控制条颜色
self.navigationController.navigationBar.tintColor = [UIColor grayColor];
//设置为左边按钮
[[self navigationItem] setLeftBarButtonItem:backButton];
//将当前视图推出栈,程序将进入上一视图
[self.navigationController popViewControllerAnimated:YES];
//直接进入根视图
[self.navigationController popToRootViewControllerAnimated:YES];