swift - 无法将类型 'subSequence'(又名 'String.CharacterView')的值转换为集合中的类型 'String'

Question

我构建了一个从数据库请求图像 url 的网络服务。我想在 swift 上展示它。但是我在 var photo 行上发现了这个错误:

Cannot convert value of type 'subSequence' (aka 'String.CharacterView') to type 'String' in collection

let requestResponse = self.sendToServer(postUrl: "localhost",data:"abc")

let Seperated = requestResponse.characters.split(separator: " ")

var photo = Seperated[0] as String

let imageURL = URL(string: photo)
if let imageData = try? Data(contentsOf: imageURL!) {
    ...
}

Answer 1

考虑这样的事情:

let requestResponse = "some string"
let separated = requestResponse.characters.split(separator: " ")

if let some = separated.first {
    let value = String(some)

    // Output: "some"
}