摘要： // Playground - noun: a place where people can playimport UIKitvar str = "Hello, playground"// color与=号之间必须有个空格let colors =[ "Air Force Blue":(red:... 阅读全文

摘要： // Playground - noun: a place where people can playimport UIKitvar str = "Hello, playground"// swift的集合类型只有数组和字典// 数组中只能存储相同类型的数据(可以是基本类型,也可以是类对象)// 申... 阅读全文