Objective-C 中有一些文字字典或数组语法吗

Objective-C 是一种面向对象的编程语言，它是基于 C 语言的扩展，并添加了一些面向对象的特性。在 Objective-C 中，我们可以使用文字字典和数组来存储和操作数据。这些数据结构提供了便捷的方法来组织和访问数据，使得编写代码更加简洁和高效。

objective-c
NSDictionary *person = @{
    @"name": @"John",
    @"age": @25,
    @"gender": @"male"
};

objective-c
NSString *name = person[@"name"];
NSInteger age = [person[@"age"] integerValue];
NSString *gender = person[@"gender"];

objective-c
NSArray *fruits = @[@"apple", @"banana", @"orange"];

objective-c
NSString *firstFruit = fruits[0];
NSString *secondFruit = fruits[1];
NSString *lastFruit = [fruits lastObject];

objective-c
// 创建一个文字字典
NSDictionary *person = @{
    @"name": @"John",
    @"age": @25,
    @"gender": @"male"
};
// 访问文字字典中的值
NSString *name = person[@"name"];
NSInteger age = [person[@"age"] integerValue];
NSString *gender = person[@"gender"];
// 创建一个数组
NSArray *fruits = @[@"apple", @"banana", @"orange"];
// 访问数组中的元素
NSString *firstFruit = fruits[0];
NSString *secondFruit = fruits[1];
NSString *lastFruit = [fruits lastObject];
// 修改文字字典和数组中的值
NSMutableDictionary *mutablePerson = [person mutableCopy];
mutablePerson[@"age"] = @26;
NSMutableArray *mutableFruits = [fruits mutableCopy];
[mutableFruits addObject:@"grape"];
// 输出结果
NSLog(@"Name: %@", name);
NSLog(@"Age: %ld", age);
NSLog(@"Gender: %@", gender);
NSLog(@"First fruit: %@", firstFruit);
NSLog(@"Second fruit: %@", secondFruit);
NSLog(@"Last fruit: %@", lastFruit);
NSLog(@"Modified age: %@", mutablePerson[@"age"]);
NSLog(@"Modified fruits: %@", mutableFruits);