Swift中含多词艺术家名的API请求URL构建错误求助

问题出在你先拼接艺术家和歌曲名再整体编码的方式，更稳妥的做法是分别对每个独立路径段（艺术家名称、歌曲名称）单独进行URL路径编码，再拼接成带斜杠的结构，这样既能保证斜杠作为路径分隔符被保留，又能将空格正确转为%20。

修改后的代码（推荐方案） #

func fetchLyrics(artist: String, title: String) async throws -> String {
    // 分别编码每个路径段，确保特殊字符被正确处理
    guard let encodedArtist = artist.addingPercentEncoding(withAllowedCharacters: .urlPathAllowed),
          let encodedTitle = title.addingPercentEncoding(withAllowedCharacters: .urlPathAllowed),
          let baseURL = URL(string: baseURL),
          let artistPathURL = URL(string: encodedArtist, relativeTo: baseURL),
          let finalURL = URL(string: encodedTitle, relativeTo: artistPathURL) else {
        throw NetworkError.invalidURL
    }
    
    print("---->", finalURL.absoluteString)

    var request = URLRequest(url: finalURL)
    request.httpMethod = "GET"

    do {
        let (data, response) = try await session.data(for: request)
        
        guard let httpResponse = response as? HTTPURLResponse, httpResponse.statusCode == 200 else {
            throw NetworkError.invalidResponse
        }

        do {
            let lyricsResponse = try JSONDecoder().decode(LyricsResponse.self, from: data)
            return lyricsResponse.lyrics
        } catch {
            throw NetworkError.decodingFailed
        }
    } catch {
        throw NetworkError.requestFailed
    }
}

关键说明 #

1. 单独编码路径段：艺术家和歌曲名是两个独立的URL路径组件，单独编码能避免斜杠被意外处理，同时确保空格、特殊字符被正确转为URL安全格式。
2. 使用URL相对构造：相比字符串拼接，URL的相对路径构造方法会自动处理baseURL结尾是否带斜杠的问题，避免出现重复斜杠或路径缺失的情况，更可靠。

内容的提问来源于stack exchange，提问作者paul oyebanjo