[OC Foundation框架 - 11] NSMutableDictionary

 

 void dicUse()
 {
     NSMutableDictionary *dic = [NSMutableDictionary dictionary];
     Student *stu1 = [Student studentWithName:@"Simon"];

     NSLog(@"stu1:%zi", [stu1 retainCount]);
     [dic setObject:stu1 forKey:@"k1"];
     NSLog(@"stu1:%zi", [stu1 retainCount]);

     [dic setObject:[Student studentWithName:@"Joke"] forKey:@"k2"];
     NSLog(@"%@", dic);

     [dic removeObjectForKey:@"k1"];
     NSLog(@"after remove stu1:%zi", [stu1 retainCount]);

     NSMutableDictionary *dic2 = [NSMutableDictionary dictionary];
     [dic2 addEntriesFromDictionary:dic];
     NSLog(@"dic2: %@", dic2);
 }

 

NSMutableDictionary不允许使用简化的集中初始化方法创建

error:

         NSMutableDictionary *d11_1 = @{@"姓名":@"张三", @"年龄":@"", @"性别":@"男"};