Question

我试图在用户按下按钮时调用retrieveData（）。

extension ViewController {

    func doOAuthFitbit2() {

        let oauthswift = OAuth2Swift(
            consumerKey:    "*****",
            consumerSecret: "*****",
            authorizeUrl:   "https://www.fitbit.com/oauth2/authorize",
            accessTokenUrl: "https://api.fitbit.com/oauth2/token",
            responseType:   "code"
        )

        oauthswift.accessTokenBasicAuthentification = true
        oauthswift.authorizeURLHandler = getURLHandler()
        let state = generateState(withLength: 20)

        let _ = oauthswift.authorize(
            withCallbackURL: URL(string: "smart://oauth-callback")!,
            scope: "profile nutrition",
            state: state,
            success: { credential, response, parameters in
                self.retrieveData(oauthswift)
        },
            failure: { error in
                print(error.description)
        }
        )
    }

    func retrieveData(_ oauthswift: OAuth2Swift) {
        print("retrieveData")
        let _ = oauthswift.client.get(
            "https://api.fitbit.com/1/user/-/profile.json",
            parameters: [:],
            success: { response in
                let jsonDict = try? response.jsonObject()
                print(jsonDict as Any)
        },
            failure: { error in
                print(error.description)
        }
        )
    }
}

我在ViewController.swift中有以下内容

@IBAction func btnRetrieveData(_ sender: Any) {
    retrieveData(oauthswift)
}

我收到以下错误：

无法转换类型＆＃39; OAuthSwift的价值？＆＃39;预期的参数类型＆＃39; OAuth2Swift＆＃39;

我认为是因为＆＃34; oauthswift＆＃34;在doOAuthFitbit2（）函数内声明。

我是否需要重构代码以使retrieveData（）函数嵌套在doOAuthFitbit2（）函数中？我将如何在ViewController.swift中调用它？

Answer 1

您的oauthswift属性是doOAuthFitbit2()函数的本地属性，因此您无法通过按钮方法（或任何其他方法）访问它。我建议首先，您可以将其添加为doOAuthFitbit2()更新的全局属性，例如：

var oauthswift: OAuth2Swift!
// ^ declare global variable

func doOAuthFitbit2() {

    oauthswift = OAuth2Swift(
    // ^ reference the global variable and set it up here
        consumerKey:    "*****",
        consumerSecret: "*****",
        authorizeUrl:   "https://www.fitbit.com/oauth2/authorize",
        accessTokenUrl: "https://api.fitbit.com/oauth2/token",
        responseType:   "code"
    )

    oauthswift.accessTokenBasicAuthentification = true
    oauthswift.authorizeURLHandler = getURLHandler()
    let state = generateState(withLength: 20)

    let _ = oauthswift.authorize(
        withCallbackURL: URL(string: "smart://oauth-callback")!,
        scope: "profile nutrition",
        state: state,
        success: { credential, response, parameters in
            self.retrieveData(oauthswift)
    },
        failure: { error in
            print(error.description)
    }
    )
}

然后你可以这样做：

func retrieveData() {
//                ^ you don't need to pass an arg here, since it's globally accessible
    print("retrieveData")
    let _ = oauthswift.client.get(
        "https://api.fitbit.com/1/user/-/profile.json",
        parameters: [:],
        success: { response in
            let jsonDict = try? response.jsonObject()
            print(jsonDict as Any)
    },
        failure: { error in
            print(error.description)
    }
    )
}

也就是说，有更稳定的方法可以实现这一点 - 例如shared instance (singleton)可以在整个应用程序中全局访问，shared delegates/protocols或iOS keychain APIs。我不会进入那些 - 你需要在那里学习和阅读。

使用按钮在Swift中调用嵌套函数

1 个答案: