arrays - 如何过滤包含字符串的数组和结构体对象数组，其中有字符串参数？

Question

我有一个数组

var friendsListGroupedFiltered = [Object]()

这个结构

struct Object {
    var letters : String
    var sectionObjects : [Friend]
}

包含另一个结构的对象数组

struct Friend {
    let name: String
    let image: UIImage?
    let likes: Int
    let isLiked: Bool
}
extension Friend: Equatable {
    static func == (lhs: Friend, rhs: Friend) -> Bool {
        return lhs.name == rhs.name
    }
}

准确地说，我想为搜索栏做一个过滤功能。我尝试过这样的

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
    guard !searchText.isEmpty else {
        friendsListGroupedFiltered = friendsListGrouped
        tableView.reloadData()
        return
    }
    friendsListGroupedFiltered = friendsListGroupedFiltered.filter {
        $0.sectionObjects.filter {
            $0.name.range (of: searchText, options: .caseInsensitive) != nil
        }
    }
    tableView.reloadData()
}

并出现错误

Cannot convert value of type '[Friend]' to closure result type 'Bool'

数组friendsListGroupedFiltered看起来像这样

[Object(
    letters: "А",
    sectionObjects: [
        Friend(name: "Августин", image: Optional(<UIImage: 0x600000d3ab50>, {200, 200}), likes: 20, isLiked: false),
        Friend(name: "Акакий", image: Optional(<UIImage: 0x600000d3ab50>, {200, 200}), likes: 20, isLiked: false),
        Friend(name: "Алёша", image: Optional(<UIImage: 0x600000d3ab50>, {200, 200}), likes: 20, isLiked: false),
        Friend(name: "Армэн", image: Optional(<UIImage: 0x600000d3ab50>, {200, 200}), likes: 20, isLiked: false)
    ]
),
Object(
    letters: "В",
    sectionObjects: [
        Friend(name: "Вася", image: Optional(<UIImage: 0x600000d3ab50>, {200, 200}), likes: 20, isLiked: false)
    ]
),
Object(
    letters: "К",
    sectionObjects: [
        Friend(name: "Коловрат", image: Optional(<UIImage: 0x600000d3ab50>, {200, 200}), likes: 20, isLiked: false)
    ]
)

等等
如何按“名称”对包含在另一个结构的另一个对象数组中的数组进行排序？

Answer 1

filter 的结果是过滤对象的数组 ([Friend])，但过滤闭包的结果是 Bool。

这就是错误消息告诉您的内容。

您可以检查过滤后的数组是否不为空，但更好的是contains

friendsListGroupedFiltered = friendsListGrouped.filter {
    $0.sectionObjects.contains {
        $0.name.range (of: searchText, options: .caseInsensitive) != nil
    }
}