请参阅UIImage类参考:

See the UIImage class reference:

http://developer.apple.com/library/ios/#documentation/uikit/reference/UIImage_Class/Reference/Reference.html

void UIImageWriteToSavedPhotosAlbum (
   UIImage  *image,
   id       completionTarget,
   SEL      completionSelector,
   void     *contextInfo
);

添加到相机胶卷相册(相机)或已保存的相册(无相机).

Adds to the camera roll album (camera) or saved photos album (no camera).