iOS 图片浏览器 DIY

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shaokun

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

Tecnología

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

• Three20

• Facebook iPhone

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

• Camera
• UIImagePickerControllerSourceTypeCamera

• Photo Library

• 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

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

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?)

• Categories UIImage

• @Interface UIImage (Resize)

• by Trevor Harmon

• http://vocaro.com/trevor/blog/2009/10/12/resize-a-uiimage-
the-right-way/

UIImage converted to NSData, Documents Directory

• UIImage NSData

• NSData *imageData = UIImagePNGRepresentation(image);

• NSData *imageData = UIImageJPEGRepresentation(image);

• Application Documents

• iOS 3.1.3 build Documents

• SaveImageToFile

•
• NSInvocationOperation

• NSOperationQueue

• [NSOperationQueue sharedOperationQueue];

@interface NSOperationQueue (SharedQueue)

• GridView *gridView = [[GridView new] initWithCols:4 size:75 margin:4];

• [gridView addSubView:imageView];

•
• UIScrollView UIImageView

• UIImageView x

•
• UIScrollView UIImageView

• UIScrollView

• maximumZoomScale, minimumZoomScale, zoomScale

• Implement UIScrollViewDelegate UIImageView

• - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView

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iOS 图片浏览器 DIY

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. • • • • DIY

5. • • • •

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

25.

26. Thank You!

iOS 图片浏览器 DIY

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iOS 图片浏览器 DIY

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