我使用以下代码登录facebook:
@IBAction func fbLoginBtnDidTouch(sender: AnyObject) {
let fbLoginManager : FBSDKLoginManager = FBSDKLoginManager()
fbLoginManager.logInWithReadPermissions(["email"], fromViewController: self) { (result, error) -> Void in
if (error == nil){
let fbloginresult : FBSDKLoginManagerLoginResult = result
if(fbloginresult.grantedPermissions.contains("email"))
{
self.getFBUserData()
}
}
}
}
的AppDelegate:
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
}
func application(application: UIApplication, openURL url: NSURL, sourceApplication: String?, annotation: AnyObject) -> Bool {
return FBSDKApplicationDelegate.sharedInstance().application(application, openURL: url, sourceApplication: sourceApplication, annotation: annotation)
}
这将在webview中启动FB。如果用户从FB帐户接受应用程序,它将按预期返回应用程序。
但是,如果用户点击否或点击带有FB的网页浏览中的完成按钮,应用就会崩溃说(致命错误:意外发现为零展开可选值)
标记此行:
if(fbloginresult.grantedPermissions.contains("email"))
那么,如果用户点击“否”或“完成”,为什么应用会崩溃?
答案 0 :(得分:21)
首先检查用户是否取消登录。应用程序崩溃,因为没有授予权限。 FBSDKLoginManagerLoginResult
if (error == nil){
let fbloginresult : FBSDKLoginManagerLoginResult = result
if result.isCancelled {
return
}
if(fbloginresult.grantedPermissions.contains("email"))
{
self.getFBUserData()
}
}