这里是数组的使用
-
创建一个指定类型以及指定默认值和数组大小的数组，一个是字面量的，一个是NSArray的
var someInts = [Int](repeating: 0, count: 3)//创建一个指定类型以及指定默认值和数组大小的数组 //print(someInts)//0 0 0 someInts[0] = 1; //print(someInts)//1 0 0 someInts.append(2); //print(someInts)//1 0 0 2 //print(someInts+[3])//1 0 0 2 3 someInts.insert(10, at: 0) //print(someInts)//10, 1, 0, 0, 2 someInts.remove(at: 0) //print(someInts)//1, 0, 0, 2 //someInts.removeLast()删除第一个 //someInts.removeLast()//删除最后一个 someInts.removeAll()//删除全部 print(someInts)//
var arr1: NSArray = ["1","2","3","4","5"];//创建一个数据
print(arr1[0]);//1 输出打印某一个值
print(arr1.object(at: 0));//1 和上面是等价的
var arr2: NSArray = NSArray.init(array: arr1)
print(arr2);//1 2 3 4 5
var arr3: NSArray = NSArray.init(object: "2");
print("arr3:(arr3)")//2
var arr4: NSArray = NSArray.init(objects: "2","3");
print("arr4:(arr4)")// 2 3
- 可变数组的使用
var arr1: NSArray = ["1","2","3","4","5"];
var arr2: NSMutableArray = NSMutableArray.init();
arr2.addObjects(from: arr1 as! [Any]);//把arr1中所有的obj添加到arr2
print(arr2);//1 2 3 4 5
arr2.add("6")//添加一个对象
print(arr2);//1 2 3 4 5 6
arr2.insert("0", at: 0);//在指定的地方插入一个对象
print(arr2);//0 1 2 3 4 5 6
arr2.remove("0");//删除指定的对象
print(arr2);//1 2 3 4 5 6
arr2.removeLastObject();//删除最后一个对象
print(arr2);//1 2 3 4 5
arr2.removeObject(at: 1);//删除指定索引的对象
print(arr2);//1 3 4 5
arr2.replaceObject(at: 2, with: "10")//覆盖指定索引的对象
print(arr2);//1 3 10 5
arr2.removeAllObjects();//清空数组
- 数组的遍历的两种方式
for obj in arr1 {//数据遍历
print(obj);// 1 2 3 4 5
}
for (index,item) in arr1.enumerated()
{
print("index:(index) obj:(item)",terminator: " ");
//输出结果 index:0 obj:1 index:1 obj:2 index:2 obj:3 index:3 obj:4 index:4 obj:5
}
字典的使用
-
创建一个指定key类型和value类型的字典
//var someDict = [KeyType: ValueType]()//创建一个指定key类型和value类型的字典
var dic1 = [String:String]();
dic1["1"] = "one"
dic1["2"] = "Two"
dic1["3"] = "Three"
// print(dic1);//["2": "Two", "1": "one", "3": "Three"]
// print(dic1["1"]);//Optional("one") 访问指定key的值
var dic2:[Int:String] = [1:"One", 2:"Two", 3:"Three"]
print(dic2);//[3: "Three", 1: "One", 2: "Two"]
dic2.updateValue("first", forKey: 1);//修改指定key的值
print(dic2);//[3: "Three", 1: "first", 2: "Two"]
dic2.removeValue(forKey: 1);//移除指定key的值
print(dic2);//[3: "Three", 2: "Two"]
- NSDictionary的使用
var dic1: NSDictionary = NSDictionary.init(objects: ["1","2","3"], forKeys: ["one" as NSCopying,"two" as NSCopying,"three" as NSCopying]);
print(dic1);
{
one = 1;
three = 3;
two = 2;
}
print(dic1.object(forKey: "one"))//Optional(1)
print(dic1.allKeys);//[one, two, three]
-
NSMutableDictionary的使用
var dic1: NSDictionary = NSDictionary.init(objects: ["1","2","3"], forKeys: ["one" as NSCopying,"two" as NSCopying,"three" as NSCopying]);
var dic2: NSMutableDictionary = NSMutableDictionary.init(dictionary: dic1);
print(dic2);
dic2.setObject("4", forKey: "four" as NSCopying);//新增
print(dic2);
dic2.removeObject(forKey: "four");//删除
print(dic2)
dic2.setObject("11", forKey: "one" as NSCopying)//修改
print(dic2);
dic2["one"] = "12"//修改
print(dic2);
dic2.removeAllObjects();//删除全部
print(dic2);
- 字典的遍历
for (key, value) in dic2 {
print("字典 key (key) - 字典 value (value)")
}
for (key, value) in dic2.enumerated() {
print("字典 key (key) - 字典 (key, value) 对 (value)")
}
- print的基础使用
for x in 0...10{
print("(x) ", terminator: "*")//terminator是指链接符号
}
print()
print(1.0, 2.0, 3.0, 4.0, 5.0, separator: "*")//separator设置连接符号
