/* 配置navigation bar外观开始 */
self.navigationBar.translucent = YES;
self.navigationBar.titleTextAttributes =
[NSDictionary dictionaryWithObject:[UIColor whiteColor]
forKey:NSForegroundColorAttributeName];
self.navigationBar.tintColor = [UIColor whiteColor]; // 文字颜色
self.navigationBar.barTintColor = // navigation bar颜色
[[UIColor alloc] initWithRed:17/255.0 green:169/255.0 blue:172/255.0 alpha:0.5];
/* 配置navigation bar外观结束 */