PDF阅读的实现

实现pdf文件的阅读。

使用自定义的UIView，继承自UIView，

1、项目中新建一个类，命名为PdfView。

#import <Foundation/Foundation.h>

@interface PdfView : UIView { 
    CGPDFDocumentRef pdf;
    int pIndex;
}

@propertyint pIndex;
-(void)drawInContext:(CGContextRef)context;//进行绘制PDF
-(void)initPDF:(NSInteger)pageIndex;//初始化PDF
-(NSInteger) getNumberOfPages;//得到当前PDF的全部页数

@end

 

 

 

#import "PdfView.h"

@implementation PdfView 

@synthesize pIndex;

- (id)initWithFrame:(CGRect)frame
{
    self = [superinitWithFrame:frame];
    if (self) {
       
    }
    return self;
}
 //初始化，可以直接默认开始的页码。
- (void)initPDF:(NSInteger)pageIndex {

    if(self != nil) 
    { 
        CFURLRef pdfURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(), CFSTR("test1.pdf"), NULL, NULL);
        pdf = CGPDFDocumentCreateWithURL((CFURLRef)pdfURL);
        pIndex = pageIndex;
        CFRelease(pdfURL);
    }
}

-(NSInteger) getNumberOfPages {
    returnCGPDFDocumentGetNumberOfPages(pdf);
}

-(void)drawInContext:(CGContextRef)context 
{ 
    // PDF page drawing expects a Lower-Left coordinate system, so we flip the coordinate system 
    // before we start drawing. 
    CGContextTranslateCTM(context, 0.0, self.bounds.size.height); 
    CGContextScaleCTM(context, 1.0, -1.0); 
    
    // Grab the first PDF page 
    CGPDFPageRef page = CGPDFDocumentGetPage(pdf, pIndex); 
    
    // We’re about to modify the context CTM to draw the PDF page where we want it, so save the graphics state in case we want to do more drawing 
    CGContextSaveGState(context); 
    // CGPDFPageGetDrawingTransform provides an easy way to get the transform for a PDF page. It will scale down to fit, including any 
    // base rotations necessary to display the PDF page correctly. 
    CGAffineTransform pdfTransform = CGPDFPageGetDrawingTransform(page, kCGPDFCropBox, self.bounds, 0, true); 
    // And apply the transform. 
    CGContextConcatCTM(context, pdfTransform); 
    // Finally, we draw the page and restore the graphics state for further manipulations! 
    CGContextDrawPDFPage(context, page); 
    CGContextRestoreGState(context); 
}

- (void)drawRect:(CGRect)rect { 
    [selfdrawInContext:UIGraphicsGetCurrentContext()]; 
}

@end

 

2、在使用PDF的地方，导入这个类，然后

   PdfView *pdfView = [[PdfViewalloc]initWithFrame:self.view.frame];
    [pdfView initPDF:1];

    [self.viewaddSubview:pdfView];

这样就可以看到第一页了，如果要实现翻页。就自己实现哈。