Make your own Photos App as iPhone's. For DEMO project, please check out https://github.com/shaokun/iOSPhotosDIY

1. iOS DIY
shaokun@kudelabs.com
http://t.sina.com.cn/shaokunwu

2. • Three20
• Facebook iPhone
•
• Facebook, Flickr, Tweetie, Gowalla...
• https://github.com/facebook/three20

4. •
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• DIY

5. •
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6. UIImagePickerControllerDelegate

7. • Camera
• UIImagePickerControllerSourceTypeCamera
• Photo Library

8. • UIImagePickerControllerDelegate
“In software engineering, the delegation pattern is a design pattern in object-oriented
programming where an object, instead of performing one of its stated tasks, delegates
that task to an associated helper object.” -- wikipedia
• - imagePickerController:didFinishPickingMediaWithInfo:
• - imagePickerControllerDidCancel:
• - imagePickerController:didFinishPickingImage:editingInfo:
Deprecated in iOS 3.0

9. YourController.h

10. YourController.m

11. Original, Large, Medium, Small, Thumbnail...

12. Why?
• 1600 * 1200
Type RAM
• 32-bit
iPhone 128 MB
• width * height * (32 / 8) =
iPhone 3G 128 MB
• 1600 * 1200 * 4 =
iPhone 3GS 256 MB
7,680,000 = ~8 MB
• Application
iPhone 4 512 MB
(10~20 MB?)

13. • Categories UIImage
• @Interface UIImage (Resize)
• by Trevor Harmon
• http://vocaro.com/trevor/blog/2009/10/12/resize-a-uiimage-
the-right-way/

14. UIImage converted to NSData, Documents Directory

15. • UIImage NSData
• NSData *imageData = UIImagePNGRepresentation(image);
• NSData *imageData = UIImageJPEGRepresentation(image);
• Application Documents
• iOS 3.1.3 build Documents

16. (void)saveImageToFile

17. • SaveImageToFile
•
• NSInvocationOperation
• NSOperationQueue
• [NSOperationQueue sharedOperationQueue];

18. @interface NSOperationQueue (SharedQueue)

19. Grid View & Browser

20. GridView.h
GridView.m

21. • GridView *gridView = [[GridView new] initWithCols:4 size:75 margin:4];
• [gridView addSubView:imageView];

22. •
• UIScrollView UIImageView
• UIImageView x

23. •
• UIScrollView UIImageView
• UIScrollView
• maximumZoomScale, minimumZoomScale, zoomScale
• Implement UIScrollViewDelegate UIImageView
• - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView

24. UIScrollView inside UIScrollView

26. Thank You!