iOS-更改UINavigationBar样式+更改返回ButtonItem文字

iOS7之后. 默认的返回按钮字体颜色是蓝色的, 显示内如是父VC(上一级界面)的title
如果要做修改, 可以通过下面的办法:

1. 修改字体颜色

(1) 在plist里面, 加上View controller-based status bar appearance, 并且设置为NO

(2) 在需要修改的那个界面. 加入如下代码(加在viewDIdLoad即可)

self.navigationController.navigationBar.barStyle = UIStatusBarStyleDefault;  
[self.navigationController.navigationBar setTintColor:[UIColor greenColor]];  

或:

//Nav样式
    application.statusBarStyle = UIStatusBarStyleLightContent;
    [UINavigationBar appearance].barTintColor =[UIColor colorWithRed:24/255.0 green:30/255.0 blue:43/255.0 alpha:1.0];
    [UINavigationBar appearance].tintColor = [UIColor whiteColor];
    NSDictionary *NavTextAttribute = @{
                                       //字体颜色
                                       NSForegroundColorAttributeName:[UIColor whiteColor],
                                       //字体大小
                                       NSFontAttributeName:[UIFont boldSystemFontOfSize:18]};
    [UINavigationBar appearance].titleTextAttributes = NavTextAttribute;

2.更改UINavgation的navigationItem返回ButtonItem文字

UIBarButtonItem *backItem = [[UIBarButtonItem alloc] init];
backItem.title = @"返回";
self.navigationItem.backBarButtonItem = backItem;