在Swift中展开一个简短的URL [英] Expand a short URL in Swift

问题描述

如果有一个简短的网址 https://itun.es/us/JB7h_ ，您如何扩展它进入完整的URL？

Given a short URL https://itun.es/us/JB7h_, How do you expand it into the full URL?

推荐答案

分机

Extension

extension NSURL {
    func expandURLWithCompletionHandler(completionHandler: (NSURL?) -> Void) {
        let dataTask = NSURLSession.sharedSession().dataTaskWithURL(self, completionHandler: {
            _, response, _ in
            if let expandedURL = response?.URL {
                completionHandler(expandedURL)
            }
        })
        dataTask.resume()
    }
}

示例

Example

let shortURL = NSURL(string: "https://itun.es/us/JB7h_")

shortURL?.expandURLWithCompletionHandler({
expandedURL in
    print("ExpandedURL:\(expandedURL)")
    //https://itunes.apple.com/us/album/blackstar/id1059043043
})

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