Quick Look for iOS

Ever wanted to preview files like Apple's Mail app does? Quick Look is an Apple framework that lets you do just that.

1. Quick Look for iOS By Robert Brown @robby_brown
2. What is Quick Look? Previews all common files Includes AirPrint Available since iOS 4.0
3. QLPreviewItem Protocol for previewing files (Required) -(NSURL)previewItemURL Must be a file URL (i.e. file://somefile.txt) Use [NSURL fileURLWithPath:somePath] (Optional) -(NSString)previewItemTitle NSURL conforms to QLPreviewItem
4. QLPreviewController Subclass of UIViewController Can be pushed into view or presented modally Must have a data source May have a delegate
5. QLPreviewController iWork Documents Microsoft Office Documents (1997+) RTF PDF Images Text files (with supported UTI) CSV HTML
6. QLPreviewControllerDataSource Similar to UITableViewDataSource Tells how many QLPreviewItems it provides Returns a QLPreviewItem when asked
7. QLPreviewControllerDelegate Provides call backs for when the view will dismiss and did dismiss Provides a couple animation call backs One call back asking permission to open URLs
8. UIDocumentInteractionController Manages user interactions with files on the local system More control than QLPreviewController Only previews one file Provides easy access to a file’s icons Provides access to annotation property for passing custom data with a file
9. Inter-app File Sharing Files aren’t “shared,” they are copied into the app’s sandbox (~Documents/Inbox) An app’s Info.plist specifies which files are accepted with the CFBundleDocumentTypes key CFBundleDocumentTypes is an array of dictionaries
10. Inter-app File Sharing CFBundleDocumentTypes sub keys: CFBundleTypeName: Name of the type CFBundleTypeIconFiles: array of icons (smallest to largest) LSItemContentTypes: array of UTIs LSHandlerRank: Owner, Alternate, None, Default
11. Inter-app File Sharing LSHandlerRank (in order of precedence): Owner: Creator of these files Alternate: Secondary viewer None: Files can only be loaded through iTunes Default: Accepts files
12. Inter-app File Sharing Developer tip: Use mdls command on a file to see its UTI tree
13. Questions?
14. Demo
15. Want to learn more? robsprogramknowledge.blogspot.com Document Interaction Programming Topics for iOS WWDC 2010 Session 106