NSDictionary
//
// main.m
// 06-NSDictionary
//
/*
集合
1.NSArray\NSMutableArray
* 有序
* 快速创建（不可变）：@[obj1, obj2, obj3]
* 快速访问元素：数组名[i]
2.NSSet\NSMutableSet
* 无序
3.NSDictionary\NSMutableDictionary
* 无序
* 快速创建（不可变）：@{key1 : value1, key2 : value2}
* 快速访问元素：字典名[key]
*/
#import <Foundation/Foundation.h>
void usemutabley()
{
NSMutableDictionary *dicCity = [NSMutableDictionary dictionary];
NSMutableArray *arrhot =[dicCity objectForKey:@"hot"];
NSMutableArray *arrother =[dicCity objectForKey:@"other"];
NSLog(@"city %@,",dicCity);
}
int main()
{
NSArray *persons = @[
@{@"name" : @"jack", @"qq" : @"432423423", @"books": @[@"5分钟突破iOS编程", @"5分钟突破android编程"]},
@{@"name" : @"rose", @"qq" : @"767567"},
@{@"name" : @"jim", @"qq" : @"423423"},
@{@"name" : @"jake", @"qq" : @"123123213"}
];
//
// NSDictionary *jim = persons[2];
//
NSString *bookName = persons[0][@"books"][1];
NSLog(@"%@", bookName);
//NSArray *array = persons[0][@"books"];
//NSLog(@"%@", array);
// 先取出1位置对应的字典
// 再取出字典中qq这个key对应的数据
//NSLog(@"%@", persons[1][@"qq"]);
// NSLog(@"%@", jim);
return 0;
}
void use4()
{
// 字典不允许有相同的key，但允许有相同的value（Object）
// 字典的无序的
NSDictionary *dict = @{
@"address" : @"北京",
@"name" : @"jack",
@"name2" : @"jack",
@"name3" : @"jack",
@"qq" : @"7657567765"};
// NSArray *keys = [dict allKeys];
//
// for (int i = 0; i<dict.count; i++)
// {
// NSString *key = keys[i];
// NSString *object = dict[key];
//
//
// NSLog(@"%@ = %@", key, object);
// }
[dict enumerateKeysAndObjectsUsingBlock:
^(id key, id obj, BOOL *stop) {
NSLog(@"%@ - %@", key, obj);
// *stop = YES;
}];
}
void use3()
{
NSMutableDictionary *dict = @{@"name" : @"jack"};
[dict setObject:@"rose" forKey:@"name"];
}
void use2()
{
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
// 添加键值对
[dict setObject:@"jack" forKey:@"name"];
[dict setObject:@"北京" forKey:@"address"];
[dict setObject:@"rose" forKey:@"name"];
// 移除键值对
// [dict removeObjectForKey:<#(id)#>];
NSString *str = dict[@"name"];
//NSLog(@"%@", str);
NSLog(@"%@", dict);
//NSLog(@"%@", @[@"jack", @"rose"]);
}
void use()
{
/*
字典：
key ----> value
索引 ----> 文字内容
里面存储的东西都是键值对
*/
// NSDictionary *dict = [NSDictionary dictionaryWithObject:@"jack" forKey:@"name"];
// NSArray *keys = @[@"name", @"address"];
// NSArray *objects = @[@"jack", @"北京"];
// NSDictionary *dict = [NSDictionary dictionaryWithObjects:objects forKeys:keys];
/*
NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:
@"jack", @"name",
@"北京", @"address",
@"32423434", @"qq", nil];*/
NSDictionary *dict = @{@"name" : @"jack", @"address" : @"北京"};
// id obj = [dict objectForKey:@"name"];
id obj = dict[@"name"];
NSLog(@"%@", obj);
// 返回的是键值对的个数
NSLog(@"%ld", dict.count);
}
