1. 需要注册facebook的developer帐户
developers.facebook.com
2. 然后添加你的app，这样你会得到app id
developers.facebook.com/app
3. 将得到app id加入到你的xcode的工程的 .plist文件中，方法是添加新的一行，名字为FacebookAppID，值为你刚得到的值。
如果没有这一步，就会导致你在点击登陆，切换到safari的时候，会提示打开失败，原因是你没有提供FacebookAppID或者FacebookAppID的值是无效的。
4. 点击okay按钮，弹出
Cannot Open Page
Bind your application to a URL scheme corresponding to your Facebook application ID. The URL scheme you must bind to is of the format “fb[appId]://”, where [appId] is your Facebook application ID. Without this, your application won’t be able to handle authorization
callbacks. Modify your application’s .plist file as follows:
- Under the root key (“Information Property List”) add a new row and name the key “URL types”.
- Under the “URL types” key that you just added, you should see a key named “Item 0”. If not, add a new row with key “Item 0”.
- Under the “Item 0” key, add a new row and name the key “URL Schemes”.
- Under the “URL Schemes” key that you just added, you should see a key named “Item 0”. If not, add a new row with key “Item 0”.
- Set the value of “Item 0” to “fb[appId]” where [appId] is your Facebook application ID. Make sure there are no spaces anywhere in this value. For example, if your application’s id is 1234, the value should be “fb1234”.
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