How can i login without permission dialog on facebook with ios sdk?

Question

in my application on iphone when i call

[facebook authorize:permissions delegate:self];

the framework show login dialog automatically if i'm not loggedin, and then show permission dialog (This is great for the frist time that a user use the application). But if i've aleady get permission i always show the dialog with message "You have aleady authorized this application".

So, how can i login without show permission dialog? Or can i check if i've aleady get permission to the application?
In the framework sample code the only way to login is by authorize method...

Thanks in advance.

Answer 1

您可以在设备上本地存储访问令牌（确保请求offline_access权限），然后在下一次用户使用您的App时检查该令牌是否仍处于活动状态（调用/ me / permissions或类似的东西）-如果是仍处于活动状态，您无需返回Facebook重新进行身份验证-如果不是，则您当前使用的登录代码仍然可以。