iOS navigationBar的一些知识点

1.更改状态栏颜色

以前的做法是

[[UIApplication sharedApplication] setStatusBarStyle: UIStatusBarStyleLightContent];

ios9之后的做法是在自定义的navigationController里面重写

-(UIStatusBarStyle)preferredStatusBarStyle{
    return UIStatusBarStyleLightContent;
}

2.更改背景图片

[self.navigationController.navigationBar setBackgroundImage:
     [UIImage imageNamed:@"NaviBack"] forBarMetrics:UIBarMetricsDefault];

3.更改title的颜色

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

4.更改返回箭头颜色

 self.navigationController.navigationBar.tintColor = [UIColor whiteColor];