我指的是 Apple 的 Swift 编程指南，以了解用 Swift 语言创建可变/不可变对象（数组、字典、集合、数据）。但我无法理解如何在 Swift 中创建不可变集合。

我希望看到 Swift 中 Objective-C 中的等价物

不可变数组

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

可变数组

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

不可变字典

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

可变字典

NSMutableDictionary *mDictionary = [[NSMutableDictionary alloc]initWithObjectsAndKeys:@"Value1", @"Key1", @"Value2", @"Key2", nil];
[mDictionary setObject:@"Value3" forKey:@"Key3"];

Arrays

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","Second","Third"]

创建可变数组

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

将对象追加到数组

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"]

将新对追加到字典中

dictionary["Item 3"] = "description"

More information on Apple Developer