A string is a series of characters, such as “hello, world” or “albatross”. Swift strings are represented by the String t

栈和队列是在程序设计中被广泛使用的的两种线性数据结构，它们的特点在于基本操作的特殊性，栈必须按“后进先出”的规则进行操作，而队列必须按“先进先出”的规则进行操作。和线性表相比，它们的插入和删除操作受更多的约束和限制，故又称限定性的线性表结

Basic OperatorsAn operator is a special symbol or phrase that you use to check, change, or combine values.Swift supports

可变字典中setValue:forKey和setObject:forKey的区别在开发过程中，使用字典的频率也是非常高的，也经常会遇到一个类似-[__NSPlaceholderDictionary initWithObjects:forKe

UIStackView

AttributesThere are two kinds of attributes in Swift—those that apply to declarations and those that apply to types. An

MethodsMethods are functions that are associated with a particular type. Classes, structures, and enumerations can all d

参考文档：设置不同section中cell的圆角UITableView对每一组（section）设置圆角Swift - 实现tableView中section分组圆角效果2（含有分区头、尾的情况 自定义collectionLayout横向排

Properties associate values with a particular class, structure, or enumeration.Stored properties store constant and vari

Comparing Structures and ClassesStructures and classes in Swift have many things in common. Both can: Define properties