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• (void)viewDidLoad {
  [super viewDidLoad];
  UINavigationBar *nav = [[UINavigationBar alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 70)];

  [nav setBackgroundImage:[UIImage imageNamed:@”NavBack.png”] forBarMetrics:UIBarMetricsDefault];

  UINavigationItem *navigationItem = [[UINavigationItem alloc]initWithTitle:@”DEMO”];

  [nav setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
  [UIColor whiteColor], UITextAttributeTextColor,

                                                               nil]];
  

// UIImage *image = [[UIImage imageNamed:@”返回箭头”]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
UIBarButtonItem *leftBtn = [[UIBarButtonItem alloc]initWithImage:[[UIImage imageNamed:@”返回箭头”]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal ] style:UIBarButtonItemStylePlain target:self action:@selector(leftBtnAction)];
navigationItem.leftBarButtonItem = leftBtn;

[nav pushNavigationItem:navigationItem animated:NO];

[self.view addSubview:nav];

}