NSDictionary使用小结（字典）

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1. #import <Foundation/Foundation.h>  
2.   
3.   
4. int main(int argc, const char * argv[])  
5. {  
6.   
7.     @autoreleasepool {  
8.   
9.         //创建字典  
10.         NSDictionary *dic1 = [NSDictionary dictionaryWithObject:@"value" forKey:@"key"];  
11.         NSLog(@"dic1 :%@", dic1);  
12.           
13.           
14.         //创建多个字典  
15.         NSDictionary *dic2 = [NSDictionary dictionaryWithObjectsAndKeys:  
16.                               @"value1", @"key1",  
17.                               @"value2", @"key2",  
18.                               @"value3", @"key3",  
19.                               @"value4", @"key4",  
20.                               nil];  
21.         NSLog(@"dic2 :%@", dic2);  
22.           
23.           
24.         //根据现有的字典创建字典  
25.         NSDictionary *dic3 = [NSDictionary dictionaryWithDictionary:dic2];  
26.         NSLog(@"dic3 :%@", dic3);  
27.           
28.           
29.         //根据key获取value  
30.         NSLog(@"key3 value :%@", [dic3 objectForKey:@"key3"]);  
31.           
32.         //获取字典数量  
33.         NSLog(@"dic count :%d", dic3.count);  
34.           
35.         //所有的键集合  
36.         NSArray *keys = [dic3 allKeys];  
37.         NSLog(@"keys :%@", keys);  
38.           
39.         //所有值集合  
40.         NSArray *values = [dic3 allValues];  
41.         NSLog(@"values :%@", values);  
42.           
43.           
44.           
45.         NSMutableDictionary *mutableDic = [[NSMutableDictionary alloc] initWithObjectsAndKeys:  
46.                                            @"mvalue1", @"mkey1",  
47.                                            @"mvalue2", @"mkey2", nil];  
48.         //添加现有的字典数据  
49.         [mutableDic addEntriesFromDictionary:dic3];  
50.         NSLog(@"mutableDic :%@",mutableDic);  
51.           
52.         //添加新的键值对象  
53.         [mutableDic setValue:@"set1" forKey:@"setKey1"];  
54.         NSLog(@"set value for key :%@",mutableDic);  
55.           
56.         //以新的字典数据覆盖旧的字典数据  
57.         [mutableDic setDictionary:dic2];  
58.         NSLog(@" set dictionary :%@",mutableDic);  
59.           
60.         //根据key删除value  
61.         [mutableDic removeObjectForKey:@"key1"];  
62.         NSLog(@"removeForkey :%@",mutableDic);  
63.           
64.         //快速遍历  
65.         for(id key in mutableDic) {  
66.             NSLog(@"key :%@  value :%@", key, [mutableDic objectForKey:key]);  
67.         }  
68.           
69.         //枚举遍历  
70.         NSEnumerator *enumerator = [mutableDic keyEnumerator];  
71.         id key = [enumerator nextObject];  
72.         while (key) {  
73.             NSLog(@"enumerator :%@", [mutableDic objectForKey:key]);  
74.             key = [enumerator nextObject];  
75.         }  
76.           
77.           
78.         //根据key数组删除元素  
79.         [mutableDic removeObjectsForKeys:keys];  
80.         NSLog(@"removeObjectsForKeys :%@",mutableDic);  
81.           
82.         [mutableDic removeAllObjects];  
83.         //删除所有元素  
84.         NSLog(@"remove all :%@", mutableDic);  
85.     }  
86.     return 0;  
87. }  

NSDictionary使用小结（字典）

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原文地址：http://www.cnblogs.com/as5346/p/4475353.html