1
//
初始化一个空字典
2
//
NSDictionary *dictionary = [[NSDictionary alloc] init];
3
//
初始化一个空典
4
//
NSDictionary *dictionary1 = [NSDictionary dictionary];
5
//
初始化的同时 添加一对键值
6
//
NSDictionary *dictionary2 = [NSDictionary dictionaryWithObject:@"value" forKey:@"key"];
7
//
初始化的同时添加多对键值
8
//
前面是值 可以是任意类型
9
//
后面是key 必须是字符串
10 NSDictionary *dictionary3 = [NSDictionary dictionaryWithObjectsAndKeys:
@"
object
",
@"
key
",
@"
object1
",
@"
key1
",
@"
object2
",
@"
key2
",nil];
11
//
字典的新方法
12
//
前面是key 后面是值 与之前的方法的键值相反
13 NSDictionary *dictionary4 = @{
@"
key
":
@"
值
",
@"
key1
":
@"
值1
"};
14 NSLog(
@"
%@
",dictionary3);
15 NSLog(
@"
%@
",dictionary4);
16
17
//
objectForKey ：通过key曲字典里面的值
18 NSLog(
@"
%@
",[dictionary4 objectForKey:
@"
key
"]);
19
//
第二种取值方式
20 NSLog(
@"
%@
",dictionary4[
@"
key1
"]);
21
22
23
//
1用字典 表达出自己的考试分数 语文 25 数学 1000 英语 3
24
25 NSDictionary *scrose = [NSDictionary dictionaryWithObjectsAndKeys:
@"
25
",
@"
chinese
",
@"
1000
",
@"
math
",
@"
3
",
@"
English
", nil];
26 [scrose objectForKey:
@"
chinese
" ];
27 [scrose objectForKey:
@"
math
"];
28 [scrose objectForKey:
@"
English
"];
29 NSLog(
@"
%@ %@ %@
",[scrose objectForKey:
@"
chinese
" ],[scrose objectForKey:
@"
math
"],[scrose objectForKey:
@"
English
"]);
30 NSDictionary *year = [NSDictionary dictionaryWithObjectsAndKeys:
@"
发芽
",
@"
春
",
@"
开花
",
@"
夏
",
@"
结果
",
@"
秋
",
@"
凋谢
",
@"
冬
",
@"
发芽1
",
@"
春1
",
@"
开花1
",
@"
夏1
",
@"
结果1
",
@"
秋1
",
@"
凋谢1
",
@"
冬1
", nil];
31
//
输出一个key对应的值
32 NSLog(
@"
%@
",[year objectForKey:year.allKeys[
0]]);
33
//
遍历所有的键值
34
//
allKeys是所有 key的一个数组
35
//
count得到数字内有多少个元素
36
for(NSString *key
in year.allKeys){
37 NSLog(
@"
%@ %@
",key,[year objectForKey:key]);
38 }
39
40
41 NSLog(
@"
%@ %@ %@ %@
",[year objectForKey:
@"
春
"],[year objectForKey:
@"
夏
"],[year objectForKey:
@"
秋
"],[year objectForKey:
@"
冬
"]);
42
执行结果：
转载于:https://www.cnblogs.com/fshmjl/p/4581930.html
