三 swift中数组与字典

import UIKit

//数组的声明
var arr1:Array<String>= ["a","b"];
var arr2:[String] = ["c", "d"];
var arr3 = [1,2];
var arr4:[NSObject] = [1, "2"];
//数组的访问
println("arr1=\(arr1)");//arr1=[a,b]

arr2.append("e");//增加
arr2.count;//元素个数
arr2.isEmpty;//是否为空
arr2 += ["f"];//连接两个数组,数组的类型必须一致

arr3[0];//通过下标访问，超出范围会报错
arr2.removeLast();//删除最后一个元素
arr2.removeAtIndex(2);//删除下表为2的元素

//字典的声明
var dic1:Dictionary<String, String> = ["a":"1", "b":"2"];
var dic2 = ["c":3,"d":"4"];
var dic3 = [3:"a",4:"b"];

dic1.count;//数据项数
dic1.description;//
dic1.indexForKey("a");

for (key, value) in dic1{
    println("key = \(key) , value = \(value)");
}