iOS模拟器应用内浏览器崩溃

Question

I'm implementing a Facebook based application and I'm testing it on iOS Simulator. When I click to login on Facebook button an in-app browser appears, then I enter my username and password and finally push the login and the permission button, but this error message appears in the Console:

WebKit discarded an uncaught exception in the
webView:decidePolicyForNavigationAction:request:frame:decisionListener: delegate: 
<NSInvalidArgumentException> *** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]:
attempt to insert nil object from objects[0]

After that nothing happens on the screen, but when I restart my app, I'm authenticated from Facebook and I can use my app normally.

How can I fix this issue? Will this happen on a real device?

Answer 1

Maybe your app is trying to cache some of their Facebook data in one of your objects. Perhaps you need to make a nil verification, then if any of the required fields are not set in Facebook, you'd see the crash you mentioned.

Try to verify if self.userProfile or other properties are non-nil.

Answer 2

最后，我解决了这个问题：我尝试访问-（void）loginViewShowingLoggedInUser：（FBLoginView *）loginView方法中的用户数据，但是-（void）loginViewFetchedUserInfo：（FBLoginView *）loginView尚未被调用一，因此未获取用户数据。