Question

我有一个数组

var friendsListGroupedFiltered = [Object]()

这种结构

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，我想为搜索栏创建过滤器功能。我这样尝试过

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()
}

并得到一个错误

无法将类型为[[Friend]]的值转换为结束结果类型为“布尔”

array friendsListGroupedFiltered数组看起来像这样

[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
如何通过包含在另一个结构的对象的另一个数组中的“名称”对数组进行排序？

Answer 1

filter的结果是已过滤对象的数组（[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，但最好是contains

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

如何过滤包含字符串和结构对象数组的数组，其中包含字符串参数？

1 个答案: