iOS NSDictionary 字典

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1.         //创建字典  
2.         NSDictionary *dic1 = [NSDictionary dictionaryWithObject:@"value" forKey:@"key"];  
3.         NSLog(@"dic1 :%@", dic1);  
4.         对于不可变NSDictionary *dic1 ＝@{@"value":@"key",@"value1":@"key1"};
5.           
6.         //创建多个字典  
7.         NSDictionary *dic2 = [NSDictionary dictionaryWithObjectsAndKeys:  
8.                               @"value1", @"key1",  
9.                               @"value2", @"key2",  
10.                               @"value3", @"key3",  
11.                               @"value4", @"key4",  
12.                               nil];  
13.         NSLog(@"dic2 :%@", dic2);  
14.           
15.           
16.         //根据现有的字典创建字典  
17.         NSDictionary *dic3 = [NSDictionary dictionaryWithDictionary:dic2];  
18.         NSLog(@"dic3 :%@", dic3);  
19.           
20.           
21.         //根据key获取value  
22.         NSLog(@"key3 value :%@", [dic3 objectForKey:@"key3"]);  
23.           
24.         //获取字典数量  
25.         NSLog(@"dic count :%d", dic3.count);  
26.           
27.         //所有的键集合  
28.         NSArray *keys = [dic3 allKeys];  
29.         NSLog(@"keys :%@", keys);  
30.           
31.         //所有值集合  
32.         NSArray *values = [dic3 allValues];  
33.         NSLog(@"values :%@", values);  
34.           
35.           
36.           
37.         NSMutableDictionary *mutableDic = [[NSMutableDictionary alloc] initWithObjectsAndKeys:  
38.                                            @"mvalue1", @"mkey1",  
39.                                            @"mvalue2", @"mkey2", nil];  
40.         //添加现有的字典数据  
41.         [mutableDic addEntriesFromDictionary:dic3];  
42.         NSLog(@"mutableDic :%@",mutableDic);  
43.           
44.         //添加新的键值对象  
45.         [mutableDic setValue:@"set1" forKey:@"setKey1"];  
46.         NSLog(@"set value for key :%@",mutableDic);  
47.           
48.         //以新的字典数据覆盖旧的字典数据  
49.         [mutableDic setDictionary:dic2];  
50.         NSLog(@" set dictionary :%@",mutableDic);  
51.           
52.         //根据key删除value  
53.         [mutableDic removeObjectForKey:@"key1"];  
54.         NSLog(@"removeForkey :%@",mutableDic);  
55.           
56.         //快速遍历  
57.         for(id key in mutableDic) {  
58.             NSLog(@"key :%@  value :%@", key, [mutableDic objectForKey:key]);  
59.         }  
60.           
61.         //枚举遍历  
62.         NSEnumerator *enumerator = [mutableDic keyEnumerator];  
63.         id key = [enumerator nextObject];  
64.         while (key) {  
65.             NSLog(@"enumerator :%@", [mutableDic objectForKey:key]);  
66.             key = [enumerator nextObject];  
67.         }  
68.           
69.           
70.         //根据key数组删除元素  
71.         [mutableDic removeObjectsForKeys:keys];  
72.         NSLog(@"removeObjectsForKeys :%@",mutableDic);  
73.           
74.         [mutableDic removeAllObjects];  
75.         //删除所有元素  
76.         NSLog(@"remove all :%@", mutableDic);  
77.     }  
78.     return 0;  
79. }

iOS NSDictionary 字典

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原文地址：http://www.cnblogs.com/xiezefeng/p/4347157.html