ios - 以 NSDictionary 作为对象的嵌套数组上的 NSPredicate

Question

我有一个像这样的 NSDictionary:

{
"2017-05-02" =     (
            {
        "always_valid" = 0;
        date = "2017-05-02";
        from = "12:00";
        to = "13:00";
    },
            {
        "always_valid" = 0;
        date = "2017-05-02";
        from = "12:00";
        to = "12:00";
    },
            {
        "always_valid" = 0;
        date = "2017-05-02";
        from = "14:00";
        "hourly_rate" = 12;
        to = "15:00";
    }
);
"2017-05-03" =     (
            {
        "always_valid" = 0;
        date = "2017-05-03";
        from = "12:00";
        to = "13:00";
    }
);
"2017-05-18" =     (
            {
        "always_valid" = 1;
        date = "2017-05-18";
        from = "12:00";
        to = "12:00";
    }
);
}

我正在尝试申请

NSPredicate *filter = [NSPredicate predicateWithFormat:@"always_valid = \"1\""];
 NSArray *alwaysvalid = [[dic allValues] filteredArrayUsingPredicate:filter];

当我有类似的结构时，它可以工作

数组>字典

但是现在好像是

数组>数组>字典

通过对数组执行 [dic allValues]。 任何帮助我应该申请什么来保持快速。

Answer 1

您需要做的是枚举您的字典并创建新的过滤字典。

NSMutableDictionary *filterDic = [[NSMutableDictionary alloc] init];
NSPredicate *filter = [NSPredicate predicateWithFormat:@"always_valid = 1"];
[dict enumerateKeysAndObjectsUsingBlock:^(NSString* key, NSArray* obj, BOOL *stop) {
     NSArray *filterArray = [obj filteredArrayUsingPredicate:filter];
     if (filterArray.count > 0) {
         filterDic[key] = filterArray;
     }
}];