Question

在这里，我只需截断s中的https字母，任何人都可以帮助我如何从字符串下面截断这个字母吗？

https://192.168.1.11/magento2/pub/media/ewl_bannerslider/slides/5.jpg

Answer 1

您真正想要的是从＆＃34; https＆＃34;更改方案到＆＃34; http＆＃34;在URL字符串中。可以使用URLComponents类型安全地操作URL：

var urlString = "https://192.168.1.11/magento2/pub/media/ewl_bannerslider/slides/5.jpg"

if var urlComponents = URLComponents(string: urlString), urlComponents.scheme == "https" {
    urlComponents.scheme = "http"
    urlString = urlComponents.string!
}

print(urlString)
// http://192.168.1.11/magento2/pub/media/ewl_bannerslider/slides/5.jpg

如果您打算创建网址请求，那么您就不需要了修改后的字符串，但仅包含已更改方案的URL(Request)：

let urlString = "https://192.168.1.11/magento2/pub/media/ewl_bannerslider/slides/5.jpg"

guard var urlComponents = URLComponents(string: urlString) else {
    // ... invalid URL string, bail out ...
}
if urlComponents.scheme == "https" {
    urlComponents.scheme = "http"
}
guard let url = urlComponents.url else {
    // ... invalid URL, bail out ...
}

let request = URLRequest(url: url)
// ...

Answer 2

尝试以下代码段：

let tmpStr = "https://192.168.1.11/magento2/pub/media/ewl_bannerslider/slides/5.jpg"
      let modifiedStr  = tmpStr.replace("https", withString:"http")
    extension String
    {
        func replace(target: String, withString: String) -> String
        {
            return self.replacingOccurrences(of: target, with: withString, options: NSString.CompareOptions.literal, range: nil)
        }
    }

Answer 3

使用方法replacingOccurrences(of:)可以轻松替换字符串中的文本。从swift2开始可以使用它。

let originalStr = "https://192.168.1.11/magento2/pub/media/ewl_bannerslider/slides/5.jpg"
let finalStr = originalStr.replacingOccurrences(of: "https", with: "http")
 print(finalStr)

<强>选项2

let str = "https://192.168.1.11/magento2/pub/media/ewl_bannerslider/slides/5.jpg"

    if str.utf16.count >= 5{
        let a = str.index(str.startIndex, offsetBy: 5)
        let result =  String(str[..<a])
        let replaced = str.replacingOccurrences(of: result, with: "http")
        print(replaced)

    }else{
        //lenght in shorter
    }

<强>选项3

 var str = "https://192.168.1.11/magento2/pub/https/ewl_bannerslider/slides/5.jpg"
    str = str.stringByReplaceonFirstOccurrenceOfString(target: "https", withString: "http")
    print(str)



extension String
{
func stringByReplaceonFirstOccurrenceOfString(
    target: String, withString replaceString: String) -> String
{
    if let range = self.range(of: target) {
        return self.replacingCharacters(in: range, with: replaceString)
    }
    return self
}
}

如何截断字符串中的字符？

3 个答案: