1----数组----
1:数组简介
(1):OC中的数组能够存放任意类型的数据AnyObject
(2):数组在内存中存放是有序的，所以对一个集合中存放的数据进行排序使用的就是数组
(3):不可变NSArray继承与可变数组NSMutableArray
2:不可变数组方法
//1.数组的创建
let arr1: NSArray = NSArray.init(objects: 10,"hello",1.234)
print(arr1)
let arr2: NSArray = [1,2,3,4,5,7,8]
print(arr2)
//将数组所有内容全部赋给另一数组 （表格、集合视图中）
let arr3 = NSArray.init(array: arr2)
print(arr3)
let arr4 = NSArray.init(objects: arr3,100,"HELLO")
print(arr4)
print(arr4.count)
//2.遍历数组
for i in 0..<arr4.count {
print(arr4[i])
}
for i in arr4 {
print(i)
}
//3.通过元素内容 获取对应的索引
if arr4.containsObject(100) {
print(arr4.indexOfObject(100))
}
//4.获取数组中第一个元素和最后一个元素
print(arr4.firstObject)
print(arr4.lastObject)
//5.将数组中的元素用指定的字符串进行拼接
//拼接的结果是一个字符串
let arr_1: NSArray = ["中国","🇨🇳","China",75]
let str_1 = arr_1.componentsJoinedByString("-")
print(str_1)
//6.将字符串按照指定的字符串进行分割 --- 分割的结果是一个数组
var str_path: NSString = "http://www.baidu.com:1234/s?wd=ios&rsv_sug4=82&inputT=802"
var array: NSArray = str_path.componentsSeparatedByString("//")
let lastStr: NSString = array.lastObject as! NSString
var lastArr: NSArray = lastStr.componentsSeparatedByString(":")
print(lastArr.firstObject!)
//7.isKindOfClass判断某个元素是否属于某个类
class Cat {
func wash() -> Void {
print("喵星人正在洗脸")
}
}
let tom = Cat.init()
var array_2: NSArray = [1,"hello",tom]
for i in array_2 {
if i.isKindOfClass(Cat) {
(i as! Cat).wash()
}
}
3.可变数组方法
//1.定义可变数组对象
var mutableArr1 = NSMutableArray.init(capacity: 0)
var mutableArr2 = NSMutableArray.init(array: [1,2,3,4,5,6,78])
var mutableArr3: NSMutableArray = [1,"hello","1611"]
//2.添加
//追加
mutableArr1.addObject("123")
mutableArr1.addObject([1,2,3,4,5,6,7,8,9])
mutableArr1.addObject("123")
print(mutableArr1)
//插入
mutableArr1.insertObject("QianFeng", atIndex: 0)
print(mutableArr1)
//3.删除
mutableArr1.removeLastObject()
//删除指定元素 如果存在多个就一起删除
if mutableArr1.containsObject("123") {
mutableArr1.removeObject("123")
print(mutableArr1)
}
//删除指定索引处的元素
//mutableArr1.removeObjectAtIndex(0)
//删除一定范围内的元素
mutableArr1.removeObjectsInRange(NSRange.init(location: 0, length: 1))
mutableArr1.removeAllObjects()
//4.修改
mutableArr2.replaceObjectAtIndex(0, withObject: ["one","two","three"])
print(mutableArr2)
//5.交换数组中元素的显示位置
mutableArr2.exchangeObjectAtIndex(0, withObjectAtIndex: 2)
print(mutableArr2)
2----字典------
1.字典简介
(1):OC中字典也是由多个键值对组成
(2):字典用于查找，key值是唯一的，不能重复
(3):字典在内存中存放是无序的
(4):OC中字典分为两种：可变字典NSMutableDictionary和不可变字典NSDictionary.可变字典是不可变字典的子类 所以可变字典能使用不可变字典的所有方法
(5):OC字典能存放任意类型的数据 通常键是字符串 值是任意类型
2.不可变字典方法
//1.创建字典
var dic1: NSDictionary = ["1":"one","2":"two","3":"three"]
var dic2 = NSDictionary.init(objects: [1,2,3,3], forKeys: ["one","two","three","four"])
var dic3 = NSDictionary.init(dictionary: dic1)
//2.字典的遍历
for (key,_) in dic1 {
let keystr = key as! String
print(keystr,dic1[keystr]!)
}
//3.获取字典中键值对个数
print(dic1.count)
//4.获取字典的所有键和所有值
print(dic1.allKeys)
print(dic1.allValues)
//5.通过值获取所有的键
print(dic2.allKeysForObject(3))
3:可变字典方法
let mutableDic1 = NSMutableDictionary.init(capacity: 0)
let mutableDic2 = NSMutableDictionary.init(dictionary: dic1)
//1.添加
mutableDic1.setObject("盗墓笔记", forKey: "movie")
mutableDic1.setObject("乔布斯传", forKey: "book")
//字典或者数组中存在中文直接调用字典或者数组对象 中文是要以UTF8格式转码
func printDic(mutableDic1: NSMutableDictionary) {
for (key,_) in mutableDic1 {
let keystr = key as! String
print(keystr,mutableDic1[keystr]!)
}
}
//2.修改
mutableDic1.setObject("美人鱼", forKey: "movie")
printDic(mutableDic1)
//3.删除
mutableDic1.removeObjectForKey("movie")
printDic(mutableDic1)
mutableDic1.removeAllObjects()
printDic(mutableDic1)
