字典的相关操作

     

        NSDictionary *dict = [[NSDictionary alloc]initWithObjectsAndKeys:@"one",@"1",@"two",@"2",@"three",@"3", nil];

        NSLog(@"1---%@",dict);

        

        // 字典的遍历

        NSEnumerator *enumerator = [dict objectEnumerator];

        id obj ;

        while (obj = [enumerator nextObject]) {

            NSLog(@"2----%@",obj);

        }

        

        NSString *str = [dict objectForKey:@"2"];

        NSLog(@"3----%@",str);

        

        for (id obj in dict) {

            NSLog(@"4-----%@",obj);

        }

        

        /* 可变字典*/

        NSMutableDictionary *mudict = [[NSMutableDictionary alloc]init];

        [mudict setObject:@"one" forKey:@"1"];

        [mudict setObject:@"two" forKey:@"2"];

        [mudict setObject:@"three" forKey:@"3"];

         NSLog(@"5---%@",mudict);

        [mudict removeObjectForKey:@"2"];

         NSLog(@"6---%@",mudict);