Foundation之NSDictionary

一、NSDictionary的使用

 1 int main(int argc, const char * argv[])
 2 {
 3 
 4     @autoreleasepool {
 5         
 6         // 创建方式一
 7         NSDictionary *dict1 = [NSDictionary dictionaryWithObjectsAndKeys:
 8                                @"value1", @"key1",
 9                                @"value2", @"key2", nil];
10         NSLog(@"%@", dict1);
11         // 创建方式二
12         NSDictionary *dict2 = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:@"value1", @"value2", nil] forKeys:[NSArray arrayWithObjects:@"key1", @"key2", nil]];
13         NSLog(@"%@", dict2);
14         
15         // 获取键值对个数
16         NSLog(@"%zi", [dict2 count]);
17         // 根据key获取value
18         NSLog(@"%@", [dict2 objectForKey:@"key1"]);
19         
20         // 遍历所有key
21         for (id key in dict2) {
22             NSLog(@"%@", [dict2 objectForKey:key]);
23         }
24         
25     
26     }
27     return 0;
28 }

posted on 2013-04-30 04:18 蓝易阅读(159) 评论(0) 收藏举报