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#Leaves

Leaves is a simple way to present a page-turning interface similar to Apple's iBooks. It comprises two classes, LeavesView and LeavesViewController, and occupies less than 100 kB compiled. It uses only public APIs, sacrificing a portion of iBooks' visual flair to ensure that your application is safe for submission to the App Store.

Leaves supports:

  • Text, images, PDFs -- anything that can be rendered in a graphics context
  • Drag or tap to turn the page
  • iPad- and iPhone-sized display areas

Leaves does not currently support:

  • Interactive elements on the page
  • Swipe gestures
  • Two-page landscape view

Leaves requires iPhone OS 3.0 or later.

#Installation

Add the files in the Leaves subdirectory to your Xcode project and ensure that you are linking against QuartzCore.framework.

#Getting Started

Creating a page-turning interface is as simple as subclassing LeavesViewController:

@interface ColorSwatchViewController : LeavesViewController
@end

...and implementing the LeavesViewDataSource protocol:

@implementation ColorSwatchViewController

- (NSUInteger) numberOfPagesInLeavesView:(LeavesView*)leavesView {
	return 10;
}

- (void) renderPageAtIndex:(NSUInteger)index inContext:(CGContextRef)ctx {
	CGContextSetFillColorWithColor(ctx, [[UIColor colorWithHue:index/10.0 
													saturation:0.8
													brightness:0.8 
														 alpha:1.0] CGColor]);
	CGContextFillRect(ctx, CGContextGetClipBoundingBox(ctx));
}

@end

For more sophisticated examples, build the Xcode project included with Leaves.

#Notes

The best way to get an answer to your question about programming with Leaves is the Leaves Developers mailing list, which I keep an eye on. But if you find a bug, be sure to visit the tracker or message me directly.