知识片段---导航栏设置背景

//字体颜色    

    [self.navigationController.navigationBar

setTitleTextAttributes:

    

  @{NSFontAttributeName:[UIFont

systemFontOfSize:19],

   

   
NSForegroundColorAttributeName:[UIColor
redColor]}];

//背景图片

    [self.navigationController.navigationBar
setBackgroundImage:[UIImage
imageNamed:titleImg]
forBarMetrics:UIBarMetricsDefault];

//背景颜色

self.navigationController.navigationBar.barTintColor
＝ [UIColor blueColor];