Objectivec NSDictionary(NSMutableDictionary)

        //NSDictionary 初始化
        NSDictionary *d1 = [NSDictionary dictionaryWithObjectsAndKeys:@"Shanghai", @"Location", @"Programmer", @"Occupation", nil];
        NSLog(@"d1: %@", d1);
    
        //NSDictionary 个数
        NSLog(@"d1 count: %ld", [d1 count]);
        
        //NSDictionary 枚举keys/values 
        //NSEnumerator *keys1 = [d1 keyEnumerator];
        NSEnumerator *objs1 = [d1 objectEnumerator];
        for (NSObject *obj1 in objs1) {
            NSLog(@"obj: %@", obj1);
        }
        
        //NSDictionary 根据key获取object
        NSLog(@"obj: %@", [d1 objectForKey:@"Location"]);
       
        //NSMutableDictionary 初始化        dictionaryWithCapacity, dictionaryWithObjectsAndKeys:<#(id), ...#>, nil
        NSMutableDictionary *d2 = [NSMutableDictionary dictionaryWithCapacity:2];
        [d2 setObject:@"Shanghai" forKey:@"Location"];
        [d2 setObject:@"Programmer" forKey:@"Occuptaion"];
        NSLog(@"d2: %@", d2);
        [d2 setObject:@"Male" forKey:@"Gender"];
        NSLog(@"d2: %@", d2);
        

---

1、初始化字典

    NSDictionary *dictionary = [[NSDictionary alloc]initWithObjectsAndKeys:@"One",@"1",@"Two",@"2",@"Three",@"3",nil];
    NSString *string = [dictionary objectForKey:@"One"];
    NSLog(@"string:%@",string);
    NSLog(@"dictionary:%@",dictionary);
    [dictionary release];

 

2、添加字典

    [dictionary setObject:@"One" forKey:@"1"];
    [dictionary setObject:@"Two" forKey:@"2"];
    [dictionary setObject:@"Three" forKey:@"3"];
    [dictionary setObject:@"Four" forKey:@"4"];

3、删除字典

[dictionary removeObjectForKey:@"3"];

转：http://blog.sina.com.cn/s/blog_4adf31ea0100nlnq.html