swift string转url失败的解决方案

问题复现

let path = "http://..."
print("path:" + path)
if let url = URL.init(string: path) {
      imgV.sd_setImage(with: url, completed: nil)
}else{
      print("路径无法转换成url")
}

如果 path中含有中文，则string转url无法成功

查看官方解读：

    /// Initialize with string.
    ///
    /// Returns `nil` if a `URL` cannot be formed with the string (for example, if the string contains characters that are illegal in a URL, or is an empty string).
    public init?(string: String)

官方给出的解释是：String转Url出错有两种可能性：String为空、含有非法字符

很明显我们的path不为空，那么就是含有非法字符。

解决方案

path = path.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)

修复后代码如下：

let path = "http://..."
path = path.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)
print("path:" + path)
if let url = URL.init(string: path) {
      imgV.sd_setImage(with: url, completed: nil)
}else{
      print("路径无法转换成url")
}