Question

我试图通过某个元素过滤我的数组。我想记录类型包含＆＃34;收入＆＃34;和createdAt等于日期但$0.createdAt!是日期类型，因此我无法使用.contain("")，我可以使用什么？

recordFilter = record.filter { $0.recordtype!.contains("Income") /*|| $0.createdAt! = recordItem.createdAt!*/}

recordFilter输出:(此结果尚未按createdAt过滤）

[<Record: 0x600000099fa0> (entity: Record; id: 0xd0000000003c0000 <x-coredata://913F25A5-B2C9-4646-9091-5EFE7F906908/Record/p15> ; data: {
    accountbook = "first book";
    amount = "\U00a59.99";
    assest = nil;
    category = "\U6295\U8d44";
    createdAt = "2017-11-16 16:00:00 +0000";
    date = nil;
    id = 15;
    recordtype = "\U6536\U5165";
    remark = "";
    toAccBook = nil;
}), <Record: 0x600000099ff0> (entity: Record; id: 0xd000000000400000 <x-coredata://913F25A5-B2C9-4646-9091-5EFE7F906908/Record/p16> ; data: {
    accountbook = "first book";
    amount = "\U00a56.58";
    assest = nil;
    category = "\U5de5\U8d44";
    createdAt = "2017-11-16 16:00:00 +0000";
    date = nil;
    id = 16;
    recordtype = "\U6536\U5165";
    remark = "";
    toAccBook = nil;
})]

之后，我试图获取数组中的所有数量字符串并将其求和。但是当我使用这段代码时，我发现它是所有单独的字符串，我如何将它组合在数组中并加以总结或者有其他方法来实现它？

let sum = recordFilter.map({Int($0.amount!.dropFirst())})
//[nil, nil]

for i in 0..<recordFilter.count{
    if recordFilter[i].amount != nil{

        let amountList = recordFilter[i].amount!.dropFirst()
        print(amountList) // I found that it's separate string.
        //9.99
        //11.22
        // ...

        //let intArray = amountList.map { Int($0)!}
        //let sum = amountList.reduce(0, +)
        //print(sum)

    }
}

Answer 1

好吧，如果你想完成两个案例（public function search() { $search = request('search'); $searchType = request('searchType'); if (strcmp($searchType, "posts") == 0) { $posts = Post::approved()->where('title', 'like', "%{$search}%") ->orWhere('description', 'like', "%{$search}%") ->get(); } elseif (strcmp($searchType, "products") == 0) { $products = Product::approved()->where('title', 'like', "%{$search}%") ->orWhere('description', 'like', "%{$search}%") ->get(); } return view('frontend.search', compact('posts', 'products')); } == recordtype＆amp;＆amp; Income == createdAt）那么为什么你没有过滤使用Your Date？

&&

如果我遗失了什么，请试试让我知道吗？

如果你想在这里总结一下，你去：

recordFilter = record.filter { return $0.recordtype!.contains("Income") && $0.createdAt! == recordItem.createdAt!}

如何用多个元素过滤数组并在Swift中找到总和？

1 个答案: