如何在NSURL字符串中包含花括号？ [英] How do I include curly braces in NSURL string?

问题描述

我有以下代码，但NSURL不喜欢花括号。它崩溃了。如果我在格式：后面的字符串前加一个@符号，它什么都不做。如果我尝试使用\来逃避括号，它就不起作用。如何使这项工作？

I have the following code, but NSURL does not like the curly braces. It crashes. If I put an @ symbol before the string after "format:" it does nothing. If I try to use \ to escape the braces, it doesn't work. How do I make this work?

func getUrlWithUpdateText(updateText: String!) -> NSURL {
    let escapedUpdateText = updateText.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)!
    let urlString = String(format: "http://localhost:3000/api/Tests/update?where={ \"name\": %@ }", escapedUpdateText)
    let url = NSURL(string: urlString)
    return url!
}

我意识到还有另一个类似的线程，但它没有转化为这种情况，一方面，这是Swift，而不是Objective-C。

I realize there's another similar thread, but it does not translate to this situation, for one thing this is Swift, not Objective-C.

推荐答案

一旦构造完毕就逃脱：

func getUrlWithUpdateText(updateText: String) -> NSURL? {
    let toEscape = "http://localhost:3000/api/Tests/update?where={ \"name\": \(updateText) }"
    if let escapedUpdateText = toEscape.stringByAddingPercentEncodingWithAllowedCharacters(
        NSCharacterSet.URLHostAllowedCharacterSet()),
       url = NSURL(string: escapedUpdateText) {
        return url
    }
    return nil
}

用法：

if let res = getUrlWithUpdateText("some text #%$") {
    print(res)
} else {
    // oops, something went wrong with the URL
}

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