包含 NSMutableArray 的 NSMutableDictionary 返回一个字符串
我试图在 NSMutableDictionary 中存储各种字符串和 NSMutableArray。基本上是一个具有各种键/值的 XML 元素和一个具有列表的子元素。
NSMutableArray *subItem = [[[NSMutableArray alloc] init] autorelease];
for (GDataXMLElement *subElement in [key children]){
[subItem addObject:[[[self runThroughElement:subElement] copy] autorelease]];
}
[item setObject:[[subItem copy] autorelease] forKey:[key name]];
当我检查类型：时
NSLog(@"Categories type: %@", [[item objectForKey: @"categories"] classForCoder]);
我得到：
类别类型：NSArray
但是在处理数据并将其存储在对象中的函数中，它突然看起来是一个字符串：
NSLog(@"Categories type: %@", [[obj objectForKey: @"categories"] classForCoder]);
这会导致：
类别类型：NSString
我不知道出了什么问题，为什么我从字典中获取字符串而不是放入其中的数组？任何帮助将非常感激！ （可能需要更多信息，所以请让我知道相关内容）
I am trying to store a variety of strings and a NSMutableArray in a NSMutableDictionary. Basically an XML element with various key/values and one subelement with a list.
NSMutableArray *subItem = [[[NSMutableArray alloc] init] autorelease];
for (GDataXMLElement *subElement in [key children]){
[subItem addObject:[[[self runThroughElement:subElement] copy] autorelease]];
}
[item setObject:[[subItem copy] autorelease] forKey:[key name]];
When I check the type:
NSLog(@"Categories type: %@", [[item objectForKey: @"categories"] classForCoder]);
I get:
Categories type: NSArray
But then in the function which deals with the data and stores it in an object it suddenly appears to be a string:
NSLog(@"Categories type: %@", [[obj objectForKey: @"categories"] classForCoder]);
Which results in:
Categories type: NSString
I am at a loss what is going wrong, why do I get a string out of the dictionary and not the array I put into it? Any help would be really appreciated!
(probably need more info, so please let me know what is relevant)
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您实际上不应该使用 classForCoder。相反，只需记录 [[obj objectForKey:@"categories"] class]。我还尝试记录直接 [obj objectForKey:@"categories"] 以查看它是否输出字符串或数组。如果它输出一个字符串，那么 obj 不是项目，或者您的字典在某个时刻被修改。
一点建议，没有任何理由执行 [[[NSMutableArray alloc] init] autorelease]。只需调用[NSMutableArray数组]即可。做同样的事情，但代码更少。对于许多类来说也是如此，寻找方便的类方法来避免你必须执行 alloc/init/autorelease 。
You shouldn't really be using classForCoder. Instead just log [[obj objectForKey:@"categories"] class]. I'd also try logging the straight [obj objectForKey:@"categories"] to see if it does output a string or an array. If it outputs a string then either obj is not item or your dictionary is being modified at some point.
One bit of advice, there isn't any reason to do [[[NSMutableArray alloc] init] autorelease]. Just call [NSMutableArray array]. Does the same thing but with less code. Same goes for many classes, look for convenience class methods to save you having to do alloc/init/autorelease.