手机通信录的demo，里面包括了根据姓名首字母进行索引，表视图分组显示-Mobile communications recorded the demo, which includes indexing according to the first letter of the name, the table view displays groups

简单的Epub阅读器，实现了自动分页、目录索引、搜索等功能-Simple Epub reader, automatic paging, directory, index, search functions

主要是实现了城市下拉列表的拼音索引功能。-Mainly implements the pinyin index function of city drop-down list.