Swift中使用Ticketmaster API遭遇keyNotFound错误求技术指导

架构老林

2026-7-16

解决Ticketmaster Discovery API调用的"keyNotFound"错误

这个错误的核心原因是你定义的解码结构体和API实际返回的JSON结构不匹配。Ticketmaster Discovery API返回的events数组并不是直接在JSON根层级，而是嵌套在_embedded字段里的。

修正步骤：

调整解码结构体，适配API的JSON结构：

let apiKey = "************"

struct EventResponse : Decodable{
    let _embedded: Embedded?
}

struct Embedded: Decodable {
    let events : [Event]
}

struct Event : Decodable{
    let id : String?
}

func fetchTMEvents() async throws -> [Event]{
    guard let urlTM = URL(string: "https://app.ticketmaster.com/discovery/v2/events.json?apikey=\(apiKey)") else {
        throw NSError(domain: "Invalid URL", code: -1)
    }
    let(data, response) = try await URLSession.shared.data(from: urlTM)
    
    // 调试时可打印返回的JSON字符串，确认结构
    if let jsonString = String(data: data, encoding: .utf8) {
        print("API返回内容：\(jsonString)")
    }
    
    let decoded = try JSONDecoder().decode(EventResponse.self, from: data)
    return decoded._embedded?.events ?? []
}

调用部分可保持不变，注意处理空数组情况：

Task {
    do {
        let events = try await fetchTMEvents()
        print("API results \(events)")
    } catch {
        print("API error \(error)")
    }
}