[英]SWIFT decodable data transfer
我在viewController中有一个usernameTextField ,在其中输入用户名和一个searchTapped按钮,其中包含以下代码:
@IBAction func searchTapped(_ sender: UIButton) {
guard let username = usernameTextField.text, username != "" else {
displayWarningLabel(withText: "Information is incorrect")
return
}
guard let gitUrl = URL(string: "https://api.github.com/users/\(username)/gists") else { return }
URLSession.shared.dataTask(with: gitUrl) { (data, response, error) in
guard let data = data else { return }
guard error == nil else { return }
do {
let gitData = try JSONDecoder().decode([Gists].self, from: data)
DispatchQueue.main.async {
self.gists = gitData
}
} catch let error {
print(error)
}
}.resume()
performSegue(withIdentifier: "GistsSegue", sender: nil)
}
从json获取数据后,我想将数据保存到此方法之外的数组要点中,但这不会发生。
var gists = [Gists]()
可能是什么问题呢?
以防万一,这是我解析json的模型:
struct Gists: Codable {
var description: String?
var files: [String: DetailGist]
}
struct DetailGist: Codable {
var filename: String?
var raw_url: String?
}
self.gists = gitData
正在被调用,但是在您调用performSegue
之后很久才被调用。 这就是异步数据访问的本质。
只需将您的performSegue
调用移动到设置self.gists
之后self.gists
。
DispatchQueue.main.async {
self.gists = gitData
performSegue(withIdentifier: "GistsSegue", sender: nil)
}
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