设置导航栏和TabBar标题的文字格式

//TabBar样式

[navi.tabBarItem setTitleTextAttributes:@{NSFontAttributeName:[UIFont boldSystemFontOfSize:13],NSForegroundColorAttributeName:[UIColor colorWithRed:64/255.0 green:101/255.0 blue:169/255.0 alpha:1]} forState:UIControlStateNormal];

//更改导航标题字体大小与颜色要在第一级页面设置 如下
// 设置导航默认标题的颜色及字体大小
self.navigationController.navigationBar.titleTextAttributes = @{UITextAttributeTextColor: [UIColor whiteColor], UITextAttributeFont:[UIFont boldSystemFontOfSize:18]};