详解IOS11新特性之larget title的实现

//必须要设置navigationBar的prefersLargeTitles属性为YES才能够显示出大标题
self.navigationController.navigationBar.prefersLargeTitles = YES;

//样式是navigationItem的枚举 有三种
typedef NS_ENUM(NSInteger, UINavigationItemLargeTitleDisplayMode) { 
/// 自动模式依赖上一个 item 的特性
UINavigationItemLargeTitleDisplayModeAutomatic,
/// 针对当前 item 总是启用大标题特性
UINavigationItemLargeTitleDisplayModeAlways,
/// Never 
UINavigationItemLargeTitleDisplayModeNever,
}
self.navigationController.navigationItem.largeTitleDisplayMode = UINavigationItemLargeTitleDisplayModeAlways;
 //为大标题添加富文本属性
 [self.navigationController.navigationBar setLargeTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor redColor],NSForegroundColorAttributeName,[UIFont systemFontOfSize:20.f],NSFontAttributeName,nil]];