在Swift中的ios – 不可变/可变集合

我指的是Apple的Swift编程指南，用于了解Swift语言中Mutable / immutable对象(Array，Dictionary，Sets，Data)的创建。但我不知道如何在Swift中创建一个不可变的集合。

我想在Objective-C中查看Swift中的以下内容

不可变数组

NSArray *imArray = [[NSArray alloc]initWithObjects:@"First",@"Second",@"Third",nil];

可变阵列

NSMutableArray *mArray = [[NSMutableArray alloc]initWithObjects:@"First",nil];
[mArray addobject:@"Fourth"];

不变字典

NSDictionary *imDictionary = [[NSDictionary alloc] initWithObjectsAndKeys:@"Value1",@"Key1",@"Value2",@"Key2",nil];

可变字典

NSMutableDictionary *mDictionary = [[NSMutableDictionary alloc]initWithObjectsAndKeys:@"Value1",nil];
[mDictionary setobject:@"Value3" forKey:@"Key3"];

数组

创建不可变数组

第一种方式：

let array = NSArray(array: ["First","Second","Third"])

第二种方式：

let array = ["First","Third"]

创建可变数组

var array = ["First","Third"]

将对象附加到数组

array.append("Forth")

词典

创建不可变字典

let dictionary = ["Item 1": "description","Item 2": "description"]

创建可变字典

var dictionary = ["Item 1": "description","Item 2": "description"]

将新对附加到字典

dictionary["Item 3"] = "description"

_{More information on Apple Developer}