ios - “Initializer for conditional binding must have Optional type, not ' [String] '”

我正在尝试为在Swift 3.0中工作的CocoaPods获取“Swift-YouTube-Player”广告连播，并且我在以下代码中遇到以下错误(错误指向let pathComponents部分)。

“用于条件绑定(bind)的初始化程序必须具有可选类型，而不是'[String]'”

public func videoIDFromYouTubeURL(_ videoURL: URL) -> String? {
    if let host = videoURL.host, let pathComponents = videoURL.pathComponents , pathComponents.count > 1 && host.hasSuffix("youtu.be") {
        return pathComponents[1]
    }
    return videoURL.queryStringComponents()["v"] as? String
}

最佳答案

看来videoURL.pathComponents不是Optional，所以您必须分解如下条件:

public func videoIDFromYouTubeURL(_ videoURL: URL) -> String? {
    if let host = videoURL.host {
        let pathComponents = videoURL.pathComponents
        if pathComponents.count > 1 && host.hasSuffix("youtu.be") {
            return pathComponents[1]
        }
    }
    return videoURL.queryStringComponents()["v"] as? String
}

关于ios - “Initializer for conditional binding must have Optional type, not ' [String] '”，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/39486299/