iphone - 比较两个 NSMutableArray

Question

我有一个包含 NSMutableDictionary 值的 NSMutableArray。我必须确定 NSMutableArray 中是否存在特定的字典值？

NSMutableArray:

表格数据:

{
    {

        categories = 267;
        "category_ids" = 267;
        "created_at" = "2012-04-18 05:32:10";
        "custom_design_from" = "2010-12-03 00:00:00";
    }
    {
        categories = 267;
        "category_ids" = 267;
        "created_at" = "2012-04-18 05:32:10";
        "custom_design_from" = "2010-12-03 00:00:00";
    }
 }

我必须识别一个特定的字典值。

我的代码:

if ( [tableData containsObject:[appDelegate.Product objectAtIndex:i]] ) 
{
     // Return Always false...
}

Answer 1

据我所知，containsObject: 方法通过向其中的所有实例发送 isEqual: 消息来检查数组是否包含给定对象。 NSDictionary 类有方法 isEqualToDictionary: 来比较字典的内容。你可以尝试这样做

- (BOOL) dictionaryArray:(NSMutableArray*)array containsDictionary:(NSDictionary*)givenDictionary
{
    BOOL result = NO;

    for( NSDictionary* dict in array )
    {
        if( [dict isEqualToDictionary:givenDictionary] )
        {
            result = YES;
        }
    }

    return result;
}

如果您的数组包含通过调用给定的字典，则此方法应该返回

NSDictionary* dict = [appDelegate.Product objectAtIndex:i];
if ( [self dictionaryArray:tableData containsDictionary:dict] )
{
    // do what you need
}