ios facebook 分享

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

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

https://developers.facebook.com/docs/ios/getting-started ios6之後

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

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

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

發現必需要isAvaliable這個方法判斷一下,緣由當settings中設置了facebook帳戶, composeViewControllerForServiceType方法返回非nil,不然返回nil.
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