在viewDidLoad函數里寫上
//自定義導航欄顏色
[self.navigationController.navigationBar setBarTintColor:[UIColor colorWithRed:50/255.0 green:147/255.0 blue:209/255.0 alpha:1]];
//自定義導航欄背景圖片
[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"bg_banner10.png"] forBarMetrics:UIBarMetricsDefault];
//修改導航欄標題字體大小和顏色
[self.navigationController.navigationBar setTitleTextAttributes:@{
NSFontAttributeName:[UIFont systemFontOfSize:19],
NSForegroundColorAttributeName:[UIColor whiteColor]
}];
