ios图书翻页效果

1,Leaves
url:https://github.com/brow/leaves
2,Paper Touch API
url:http://www.code-flakes.com/2009/12/papertouch-api.html

Question:
1,how do you measure the width and height of a string usingQuartz?
url:http://stackoverflow.com/questions/913470/iphone-sdk-how-do-you-measure-the-width-and-height-of-a-string-using-quartz
2，Read a file line by line
url:http://stackoverflow.com/questions/1044334/objective-c-reading-a-file-line-by-line
3，How to read data from NSFileHandle line by line?
url:http://stackoverflow.com/questions/3707427/how-to-read-data-from-nsfilehandle-line-by-line#3711079