为iOS实现Google登录（Swift 2.0）

我读过一些关于这个问题的文章，但没有一篇文章能解决这个问题。我正在尝试按照GoogleDeveloper提到的步骤为iOS实现GoogleSign-in

当我在代码中添加GoogleDeveloperPortal中提到的以下2委托方法时，我无法编译源代码

func application(application: UIApplication,
    openURL url: NSURL,options: [String: AnyObject]) -> Bool {
        return GIDSignIn.sharedInstance().handleURL(url,
            sourceApplication: options[UIApplicationOpenURLOptionsSourceApplicationKey],
            annotation: options[UIApplicationOpenURLOptionsAnnotationKey])
}

func application(application: UIApplication,
    openURL url: NSURL, sourceApplication: String?, annotation: AnyObject) -> Bool {
        var options: [String: AnyObject] = [UIApplicationOpenURLOptionsSourceApplicationKey: sourceApplication,
            UIApplicationOpenURLOptionsAnnotationKey: annotation]
        return GIDSignIn.sharedInstance().handleURL(url,
            sourceApplication: sourceApplication,
            annotation: annotation)
}

以下是错误屏幕截图：

试试这个

 func application(application: UIApplication,
openURL url: NSURL, options: [String: AnyObject]) -> Bool
{
return GIDSignIn.sharedInstance().handleURL(url, sourceApplication:   options[UIApplicationOpenURLOptionsSourceApplicationKey] as! String, annotation: options[UIApplicationOpenURLOptionsAnnotationKey])
}


func application(application: UIApplication,
openURL url: NSURL, sourceApplication: String?, annotation: AnyObject?) -> Bool {
return GIDSignIn.sharedInstance().handleURL(url,sourceApplication: sourceApplication,annotation: annotation)
}

---

有关示例，请参见

阅读一本关于Swift的入门书。每本书都包含可选内容。了解可选内容感谢您的快速回复@anbu进行了一些小改动：func应用程序（application:UIApplication，openURL url:NSURL，options:[String:AnyObject]）->Bool{if{available（iOS 9.0，*）{return GIDSignIn.sharedInstance（）.handleURL（url，sourceApplication:options[UIApplicationOpenURLOptionsSourceApplicationKey]as！String，annotation:options[UIApplicationOpenURLOptionsAnnotationKey]）返回false}哦，您是否检查了

是否可用（iOS 9.0，*

，欢迎兄弟