xcode iPhone 中的 PDF 阅读器
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PDF Reader in iphone
提问by Adhees
Since i am new to iphone domain., i want some best tutorial that how to make PDF Reader in iphone. Can anyone suggest me how to make PDF reader in iphone to view a locl PDF and the PDF file from internet?
由于我是 iphone 域的新手。我想要一些关于如何在 iphone 中制作 PDF 阅读器的最佳教程。谁能建议我如何在 iPhone 中制作 PDF 阅读器以查看 locl PDF 和来自互联网的 PDF 文件？
Thanks in advance.
提前致谢。
回答by libsemik
- (void)viewDidLoad
{
[super viewDidLoad];
[webView loadRequest:[NSURLRequest requestWithURL:pdfUrl]];
NSString *path = [[NSBundle mainBundle] pathForResource:@"yourPDFFile" ofType:@"pdf"];
NSURL *url = [NSURL fileURLWithPath:path];
NSURLRequest * request = [NSURLRequest requestWithURL:url];
[webView loadRequest:request];
[webView setScalesPageToFit:YES];
}
回答by GameLoading
#import <UIKit/UIKit.h>
@interface TiledPDFView : UIView {
CGPDFPageRef pdfPage;
CGFloat myScale;
}
- (id)initWithFrame:(CGRect)frame andScale:(CGFloat)scale;
- (void)setPage:(CGPDFPageRef)newPage;
@end
#import "TiledPDFView.h"
#import <QuartzCore/QuartzCore.h>
@implementation TiledPDFView
// Create a new TiledPDFView with the desired frame and scale.
- (id)initWithFrame:(CGRect)frame andScale:(CGFloat)scale{
if ((self = [super initWithFrame:frame])) {
CATiledLayer *tiledLayer = (CATiledLayer *)[self layer];
tiledLayer.levelsOfDetail = 4;
tiledLayer.levelsOfDetailBias = 4;
tiledLayer.tileSize = CGSizeMake(512.0, 512.0);
myScale = scale;
}
return self;
}
// Set the layer's class to be CATiledLayer.
+ (Class)layerClass {
return [CATiledLayer class];
}
// Set the CGPDFPageRef for the view.
- (void)setPage:(CGPDFPageRef)newPage
{
CGPDFPageRelease(self->pdfPage);
self->pdfPage = CGPDFPageRetain(newPage);
}
-(void)drawRect:(CGRect)r
{
// UIView uses the existence of -drawRect: to determine if it should allow its CALayer
// to be invalidated, which would then lead to the layer creating a backing store and
// -drawLayer:inContext: being called.
// By implementing an empty -drawRect: method, we allow UIKit to continue to implement
// this logic, while doing our real drawing work inside of -drawLayer:inContext:
}
// Draw the CGPDFPageRef into the layer at the correct scale.
-(void)drawLayer:(CALayer*)layer inContext:(CGContextRef)context
{
// First fill the background with white.
CGContextSetRGBFillColor(context, 1.0,1.0,1.0,0.5);
CGContextFillRect(context,self.bounds);
CGContextSaveGState(context);
// Flip the context so that the PDF page is rendered
// right side up.
CGContextTranslateCTM(context, 0.0, self.bounds.size.height);
// Scale the context so that the PDF page is rendered
// at the correct size for the zoom level.
CGContextScaleCTM(context, myScale,myScale);
CGContextDrawPDFPage(context, pdfPage);
CGContextRestoreGState(context);
}
// Clean up.
- (void)dealloc {
CGPDFPageRelease(pdfPage);
[super dealloc];
}
@end
Add this view to your view controller
将此视图添加到您的视图控制器
Regards, Shyam Parmar
问候， Shyam Parmar
