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ZoomingPDFViewer: Version 6.0, 2017-04-27
Added Swift port. Minor bug fixes. Multi-paged PDF viewing with UIPageViewController demonstrates two-page spline viewing in landscape orientation, which looks like a book within iBooks. The sample also uses UIScrollView and CATiledLayer to support zooming within a single-page view used in portrait orientations. This app is universal and only supports the two-page spline view in landscape orientation on iPad. Signed-off-by: Liu Lantao <[email protected]>
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‎ZoomingPDFViewer/LICENSE.txt

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Sample code project: ZoomingPDFViewer
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Version: 6.0
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IMPORTANT: This Apple software is supplied to you by Apple
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Inc. ("Apple") in consideration of your agreement to the following
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terms, and your use, installation, modification or redistribution of
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this Apple software constitutes acceptance of these terms. If you do
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not agree with these terms, please do not use, install, modify or
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redistribute this Apple software.
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In consideration of your agreement to abide by the following terms, and
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subject to these terms, Apple grants you a personal, non-exclusive
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license, under Apple's copyrights in this original Apple software (the
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"Apple Software"), to use, reproduce, modify and redistribute the Apple
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Software, with or without modifications, in source and/or binary forms;
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provided that if you redistribute the Apple Software in its entirety and
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without modifications, you must retain this notice and the following
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text and disclaimers in all such redistributions of the Apple Software.
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Neither the name, trademarks, service marks or logos of Apple Inc. may
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be used to endorse or promote products derived from the Apple Software
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without specific prior written permission from Apple. Except as
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expressly stated in this notice, no other rights or licenses, express or
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implied, are granted by Apple herein, including but not limited to any
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patent rights that may be infringed by your derivative works or by other
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works in which the Apple Software may be incorporated.
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The Apple Software is provided by Apple on an "AS IS" basis. APPLE
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MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
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THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
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OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
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MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
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AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
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STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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Copyright (C) 2017 Apple Inc. All Rights Reserved.

‎ZoomingPDFViewer/ReadMe.md

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# ZoomingPDFViewer
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Multi-paged PDF viewing with UIPageViewController demonstrates two-page spline viewing in landscape orientation, which looks like a book within iBooks. The sample also uses UIScrollView and CATiledLayer to support zooming within a single-page view used in portrait orientations. This app is universal and only supports the two-page spline view in landscape orientation on iPad.
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## FAQ
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* Why does this sample swap out the scrollview's embedded CATiledLayer-backed subview on every didEndZoom event?
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Swapping out the scrollview's tiledlayer-backed subview on every didEndZooming event allows this implementation to support essentially an "infinite" zoom scale. This is great for vector-based PDF's like blue prints or maps. The trade off is that infinite zooming is by default support in both directions, and infinite zooming out is not usually desired.
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* How do I clamp zooming in and out to maximum and minimum zoom scales?
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To clamp zooming in and out to a defined minimum and maximum scale, remove the code that swaps in and out the tiledlayer-backed subview on the scrollview's didEndZooming event. Doing so will reenable the minimumZoomScale and maximumZoomScale properties of the UIScrollView. The swapping in and out of the scrollview's subview was done purposesfully to bypass minimum and maximum zoom scales as a way to support "infinite" zooming in (which is great for detailed vector based PDFs).
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## Requirements
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### Build
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Xcode 8 or later
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### Runtime
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iOS 10 or later
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Copyright (C) 2017 Apple Inc. All rights reserved.

‎ZoomingPDFViewer/ZoomingPDFViewerCocoa/LaunchScreen.storyboard

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11134" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
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<dependencies>
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<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11106"/>
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<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
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</dependencies>
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<scenes>
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<!--View Controller-->
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<scene sceneID="EHf-IW-A2E">
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<objects>
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<viewController id="01J-lp-oVM" sceneMemberID="viewController">
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<layoutGuides>
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<viewControllerLayoutGuide type="top" id="Llm-lL-Icb"/>
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<viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
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</layoutGuides>
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<view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
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<rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
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<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
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<color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
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</view>
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</viewController>
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<placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
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</objects>
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<point key="canvasLocation" x="53" y="375"/>
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</scene>
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</scenes>
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</document>

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