通过NSDictionary循环并添加到NSMutableArray

问题描述：

我将如何循环以下NSDictionary？通过NSDictionary循环并添加到NSMutableArray

2011-10-27 11:40:23.775 Discounts[305:f803] { 
    NewDataSet =  { 
     Discounts =   (
         { 
       BIN =     { 
        text = "\n 900020"; 
       }; 
       DiscountId =     { 
        text = "\n \n d06dab1b-a2a3-464e-a522-00185fcf5e7c"; 
       }; 
       DiscountPrice =     { 
        text = "\n 75%"; 
       }; 
       GRP =     { 
        text = "\n 8013230"; 
       }; 
       PCN =     { 
        text = "\n CLAIMNE"; 
       }; 
       Title =     { 
        text = "\n duralclon"; 
       }; 
       UID =     { 
        text = "\n 100000"; 
       }; 
       text = "\n "; 
      }, 
         { 
       BIN =     { 
        text = "\n 900020"; 
       }; 
       DiscountId =     { 
        text = "\n \n 159d9ba9-462c-47a2-a23e-002137c6fd2e"; 
       }; 
       DiscountPrice =     { 
        text = "\n 75%"; 
       }; 
       GRP =     { 
        text = "\n 8013230"; 
       }; 
       PCN =     { 
        text = "\n CLAIMNE"; 
       }; 
       Title =     { 
        text = "\n allermax"; 
       }; 
       UID =     { 
        text = "\n 100001"; 
       }; 
       text = "\n "; 
      }, 
...

我已经试过：

for (id key in discountsDict) { 
    MyObject *obj = [[MyObject alloc] init]; 
    obj.Title = (NSString *)[key objectForKey:@"Title"]; // *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<__NSCFString 0x6ca2eb0> valueForUndefinedKey:]: this class is not key value coding-compliant for the key Title.' 
    [self.discounts addObject:obj]; 
    [obj release]; 
}

不太清楚我是否意味着要创建通过一个NSArray与内容，然后循环，以增加MyObject我self.discounts的NSMutableArray 。

在此先感谢。

你会得到什么错误？ – Dani

@Danie：将错误添加为引发错误的行旁边的注释。 – fuzz

你可以转储字典在目标c风格，'NSLog（@“％@”，discountsDict）'并发布它？ – Dani

答

您在询问key为objectForKey:@"Title"，但key只是一个NSString*。你真正的意思是[[discountsDict objectForKey:key] objectForKey:@"Title"]。或者，如果你支持4.0及更高版本，可以使用

[discountsDict enumerateKeysAndObjectsUsingBlock:^(id key, id val, BOOL *stop){ 
    MyObject *obj = [[MyObject alloc] init]; 
    obj.Title = [val objectForKey:@"Title"]; 
    [self.discounts addObject:obj]; 
    [obj release]; 
}];

我的目标框架是4.0，我在Xcode 4.2上，我得到以下警告：'//实例方法enumerateObjectsAndKeysUsingBlock找不到' – fuzz

此外：'NSString * title =（NSString *）[[discountsDict objectForKey：key] objectForKey： @“标题”];'也没有工作。它为'Title'返回'nil'。 – fuzz

修正了，它实际上是：'enumerateKeysAndObjectsUsingBlock'而不是'enumerateObjectsAndKeysUsingBlock'。警告停止，但仍有'Title'返回'null'。 – fuzz

答

你一定要明白，有只有一个元素（“NewDataSet”）是该字典，对吗？

是的，你意识到你已经添加了这个答案而不是评论，对吧？ – fuzz

通过NSDictionary循环并添加到NSMutableArray

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