如何從Swift 3中的URL中提取字符串？

Question

我有一個YouTube視頻的網址。現在，我需要提取一個字符串並將其保存到一個變量中。在這裏，我需要從URL中提取videoid。這個鏈接是：

https://www.youtube.com/watch?v=iTcq6L-PaDQ

現在，我需要提取iTcq6L-PaDQ斯威夫特3.

Answer 1

雨燕3.0

您可以從字符串URL獲取視頻ID爲子像下面。

let url = URL(string: "https://www.youtube.com/watch?v=iTcq6L-PaDQ")!.absoluteString 

let Id = url.substring(from: url.range(of: "?v=")!.upperBound) 

Answer 2

你可以按照這個例子

let url = ___Your_URL_HERE____ 
    let path = String(contentsOf: url) 
    let startIndex = path.index(path.startIndex, offsetBy: 32) //32 because 'https://www.youtube.com/watch?v=' is fixed from youtube 
    let videoid = path.substring(from: startIndex) 
    print(videoid) 

Answer 3

您可以通過分開URL字符串「？ v =「這對任何YouTube視頻都很常見。

let path = URL(string: "https://www.youtube.com/watch?v=iTcq6L-PaDQ") 
let url = path!.absoluteString 
let array = url.components(separatedBy: "?v=") 
let id = array[1] 
NSLog("video id: %@.", id) 

Answer 4

與URLComponents/URLQueryItem

if let urlComponents = URLComponents(string:"https://www.youtube.com/watch?v=iTcq6L-PaDQ"), 
    let queryItem = urlComponents.queryItems?.first(where: {$0.name == "v"}) { 
    print(queryItem.value!) 
} 

或作爲功能

func queryValue(for name : String, of url: URL) -> String? 
{ 
    guard let urlComponents = URLComponents(url:url, resolvingAgainstBaseURL:false), 
     let queryItem = urlComponents.queryItems?.first(where: {$0.name == name}) else { return nil } 
    return queryItem.value 
} 

queryValue(for: "v", of: URL(string:"https://www.youtube.com/watch?v=iTcq6L-PaDQ")!)