ios facebook 分享

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https://developers.facebook.com/docs/ios/share/cn

https://github.com/fbsamples/ios-howtos

https://developers.facebook.com/docs/ios/getting-startedios6以後

http://stackoverflow.com/questions/18459252/how-to-post-on-twitter-by-hiding-slcomposeviewcontroller-tweetsheettweet-instan/18460093#18460093

http://stackoverflow.com/questions/12503287/tutorial-for-slcomposeviewcontroller-sharing

http://stackoverflow.com/questions/9092142/ios-uialertview-button-to-go-to-setting-app

發現必須要isAvaliable這個方法判斷一下,原因當settings中設定了facebook賬戶, composeViewControllerForServiceType方法返回非nil,否則返回nil.