标签：swift   ios   

字符串类型

countElements()计算字符串长度。

比较字符串相等， ==。

字符串判空。isEmpty

字符串转换成int。toInt()

可选类型

int?

!

nil

数组类型

shoppingList.insert("abc",atIndex:0)

shoppingList.append("abc","bac")

shoppingList.removeAtIndex(0) //返回删除值

shoppingList.count//数组长度

for item in shoppingList {

    println(item)

}

for(index, value) in enumerate(shoppingList) {

    ....

}

字典类型

airports["LHR"] = "London"

airports.removeValueForKey()

airports.count

for(airportCode, airportName) in airports{

}

for(airportCode in airports.keys {

}

for(airportName in airports.values {

}

let airportCodes  = Array(airports.keys)

IOS8 开发之Swift - 自学之路(第三天)

标签：swift   ios   

原文地址：http://blog.csdn.net/jason_wang1989/article/details/43701117