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我正在我的应用程序中实现 Google 的 SignIn SDK，虽然一切正常，但 GIDSignButton 需要两根手指点击才能启动 OAuth 流程。

以下是所有相关代码：

在AppDelegate.swift

func application(app: 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)
}

在LoginViewController.swift

let googleLoginButton: GIDSignInButton = {
    let button = GIDSignInButton()
    button.colorScheme = .Light
    button.style = .IconOnly
    return button
}()

override func viewDidLoad() {
    super.viewDidLoad()

     var configureError: NSError?
    GGLContext.sharedInstance().configureWithError(&configureError)
    assert(configureError == nil, "Error configuring with Google services: \(configureError)")

    GIDSignIn.sharedInstance().delegate = self
    GIDSignIn.sharedInstance().uiDelegate = self

    view.addSubview(googleLoginButton)
}

func signIn(signIn: GIDSignIn!, didSignInForUser user: GIDGoogleUser!, withError error: NSError!) {
    if (error == nil) {
        // Success
    } else {
       // Failure
    }

}

同样，实际的谷歌登录工作，但该按钮需要两指点击才能工作。我怎样才能让它像普通按钮一样工作（只需要一根手指）？

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