1. //常用的方法纪录下
   
2. //以@方法创建
   
3.     __unused NSDictionary * dic3 = @{@"firstname":@"Mark",@"secondname":@"Toot",@"age":@30,@"sex":@"Male"};
   
4.     NSNumber *numObj = [NSNumber numberWithInt:100];
   
5. 
   
6.     //以一个元素初始化
   
7.     __unused NSDictionary *dic0 = [NSDictionary dictionaryWithObject:numObj forKey:@"key"];
   
8. 
   
9.     //初始化两个元素
   
10.     NSDictionary *dic1 = [NSDictionary dictionaryWithObjectsAndKeys:numObj, @"valueKey", @"1234567", @"value2",nil];
    
11. 
    
12.     //初始化新字典，新字典包含otherDic
    
13.     __unused NSDictionary *dic2 = [NSDictionary dictionaryWithDictionary:dic1];
    
14. 
    
15.     //通过枚举类型枚举字典
    
16.     NSEnumerator *enumerator = [dic1 keyEnumerator];
    
17.     id key = [enumerator nextObject];
    
18.     while (key) {
    
19.         id obj = [dic1 objectForKey:key];
    
20.         NSLog(@"%@", obj);
    
21.         key = [enumerator nextObject];
    
22.     }
    

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