从iOS swift中的字典中删除值 [英] Remove values from dictionary in iOS swift

问题描述

我有一个这样的 JSON 对象:

I have a JSON object as such:

The Result {
    shops = ({
        date = "2015-07-22T14:14:48.867618";
        "num_items" = 0;
        score = "-1";
        "total_spend" = 0;
    },
    {
        date = "2015-07-22T14:17:03.713194";
        "num_items" = 1;
        score = 5;
        "total_spend" = "1.85";
    });
}

还有我的代码:

let dict = result as! NSDictionary
var mutDict: NSMutableDictionary = dict.mutableCopy() as!     NSMutableDictionary

for (key, value) in mutDict {
    for i in 0..<backendArray.count {
        if value[i].objectForKey("num_items") === 0
            {
                //delete that shop only
            }
     }       
}

我想删除整个第一家商店及其所有内容，但不想删除第二家商店或商店.

I want to delete the whole first shop and all of it's contents, but not the second shop or the shops.

我不想把它变成一个数组，因为我不知道如何把它转回来.数据需要仍然存储为字典.谢谢

I don't want to turn it into an Array, because I can't figure out how to turn it back. Data needs to be stored still as a Dictionary. Thanks

推荐答案

字典中的键是shops，它有一个数组作为值.因此，您实际上并没有从 dictionary 中删除带有 num_items == 0 的商店，而是从数组(可能不可变)中删除.因此，通过过滤旧数组创建一个新数组，并更新字典中 shops 的值，例如:

The key in the dictionary is shops, and it has an array as value. So you are not actually deleting the shops with num_items == 0 from the dictionary but from the array (which is probably not mutable). So create a new array by filtering the old one, and update the value for shops in dictionary, e.g.:

dict["shops"] = (dict["shops"] as NSArray?)?.filter { (shop: Dictionary) in
    (shop["num_items"] as NSNumber?)?.integerValue > 0
}

(根据需要验证类型检查和强制转换；您提供的代码不是独立的，因此无法直接在操场上进行测试.)

(Verify type checks and casts as necessary; the code you gave is not stand-alone so can't test directly in a playground.)

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