URL 在 Swift 3 中始终为零 [英] URL is always nil in Swift 3
本文介绍了URL 在 Swift 3 中始终为零的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个结构体,用于调用 iTunes API.但是当我运行它时 myURL
变量永远不会被设置,它总是 nil
.不知道我做错了什么:
I have a struct that I am using to call out to the iTunes API. But when ever I run it myURL
variable is never getting set, it's always nil
. Not sure what I am doing wrong:
let myDefaultSession = URLSession(configuration: .default)
var myURL: URL?
var myDataTask: URLSessionTask?
struct APIManager {
func getJSON(strURL: String) {
myURL = URL(string: strURL)
var dictReturn: Dictionary<String, Any> = [:]
//cancel data task if it is running
myDataTask?.cancel()
print(myURL!) //<----Always nil
}
}
这是字符串:
"https://itunes.apple.com/search?media=music&entity=song&term=The Chain"
推荐答案
你得到 nil
因为 URL 包含一个空格.您需要先对字符串进行编码,然后再将其转换为 URL.
You´re getting nil
because the URL contains a space. You need to encode the string first and then convert it to an URL.
func getJSON(strURL: String) {
if let encoded = strURL.addingPercentEncoding(withAllowedCharacters: .urlFragmentAllowed),
let myURL = URL(string: encoded) {
print(myURL)
}
var dictReturn:Dictionary<String, Any> = [:]
//cancel data task if it is running
myDataTask?.cancel()
}
网址将是:
https://itunes.apple.com/search?media=music&entity=song&term=The%20Chain
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