数组
var GPLarr = [1,2,3];
var emptyArr = [String]();//声明一个空数组,字符串类型
emptyArr.append("11111");
var emptyArr2 = [Int]();//int类型
emptyArr2.append(1);
GPLarr.insert(4, at: 3);//指定位置添加元素
print("GPLarr==============\(GPLarr)");
GPLarr[0] = 3;
print("GPLarr==============\(GPLarr)");
> Swift会自动将已确定的数字类型Int和Float转换为NSNumber。这样的转换允许你基于其中一种类型创建一个NSNumber：
let n = 1;
//直接插入数组
GPLarr.insert(n, at: 4);
print("GPLarr==============\(GPLarr)");
print("GPLarr.count===========\(GPLarr.count)");
if GPLarr.isEmpty {
}
else
{
print("不为空");
}
**for循环数组**
for i in GPLarr {
print("i============\(i)");
}
**通过enumerate函数同时遍历数组的所有索引与数据**
for (index,value) in GPLarr.enumerated() {
print("index=======\(index),value===========\(value)");
}
字典
//var dicName:[key类型 : 值类型]
var GplempDic = [String:String]();
var GPLDic = ["key1":"value1","key2":"value2"];
print("\(GPLDic.values)");//字典的key
print("\(GPLDic.keys)");//字典的value
for (key,value) in GPLDic {
print("\(key):\(value)");
}
结构体
struct student
{
var ID = 1;
var NUM : Int = 1;
var name : String = "小明";
}
var student2 = student(ID: 3, NUM: 4, name: "许许多多");
student2.ID = 5;
枚举
enum compasspoint
{
case North
case Sourth
case East
case West
}
