解决此完成块 [英] Solve this completion Block

问题描述

我正在尝试解决此完成问题，但是我一直在警告很多。

i'm try to solve this completion block, but I keep having many warning.

Xcode给我警告

无法将类型'（）'的返回表达式转换为类型'[AirportModel]'

Cannot convert return expression of type '()' to return type '[AirportModel]'

对不起，我是一个初学者...在关闭过程中有点迷失了...

Sorry I'm a beginner... little lost on this closure...

我必须返回 AirportModel的向量为了显示在swiftUI的列表中，我想使用 DispatchQueue 以避免在搜索时阻塞视图：

I have to return this vector of AirportModel in order to be display in a list in swiftUI, I want use DispatchQueue in order to avoid to block the view while searching:

func filter (valoreSearhed: String, arrayTosearh: AirportVector, completionBlock: (_ airports: [AirportModel]) -> Void) -> [AirportModel]  {
    DispatchQueue.global().async {
        let results  = arrayTosearh.filter { $0.aptICAO.localizedCaseInsensitiveContains(valoreSearhed) }
        completionBlock(results)
    }
}

推荐答案

我认为它应该返回临时空数组，因此我建议使用以下

I assume by intention it should return temporary empty array, so I'd recommend the following

func filter (valoreSearhed: String, arrayTosearh: AirportVector, completionBlock: @escaping (_ airports: [AirportModel]) -> Void) -> [AirportModel]  {
    DispatchQueue.global().async {
        let results  = arrayTosearh.filter { $0.aptICAO.localizedCaseInsensitiveContains(valoreSearhed) }
        completionBlock(results)
    }
    return []
}

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