在iOS中预览pdf文件，显示pdf的三种方式
1.WebView直接显示pdf文件
2.自定义UIView，运用CGPDFDocumentRef读取pdf文件内容，进行drawRect
3.使用Apple的文件预览控件：QLPreveiewController
自定义UIView的实现方式
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| #import "RiderPDFView.h"
@implementation RiderPDFView
- (void)drawRect:(CGRect)rect
{
NSString *pathStr = [[NSBundle mainBundle] pathForResource:@"my" ofType:@".pdf"];
CGPDFDocumentRef pdfRef = [self pdfRefByFilePath:pathStr];
CGContextRef context = UIGraphicsGetCurrentContext();
CGPDFPageRef pageRef = CGPDFDocumentGetPage(pdfRef, 1);//获取指定页的内容如catPage=1，获取的是pdf第一页的内容
CGRect mediaRect = CGPDFPageGetBoxRect(pageRef, kCGPDFCropBox);//pdf内容的rect
CGContextRetain(context);
CGContextSaveGState(context);
[[UIColor whiteColor] set];
CGContextFillRect(context, rect);//填充背景色，否则为全黑色；
CGContextTranslateCTM(context, 0, rect.size.height);//设置位移，x，y；
CGFloat under_bar_height = 0.0f;
CGContextScaleCTM(context, rect.size.width / mediaRect.size.width, -(rect.size.height + under_bar_height) / mediaRect.size.height);//缩放倍数--x轴和y轴
CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
CGContextSetRenderingIntent(context, kCGRenderingIntentDefault);
CGContextDrawPDFPage(context, pageRef);//绘制pdf
CGContextRestoreGState(context);
CGContextRelease(context);
}
- (CGPDFDocumentRef)pdfRefByFilePath:(NSString *)aFilePath
{
CFStringRef path;
CFURLRef url;
CGPDFDocumentRef document;
path = CFStringCreateWithCString(NULL, [aFilePath UTF8String], kCFStringEncodingUTF8);
url = CFURLCreateWithFileSystemPath(NULL, path, kCFURLPOSIXPathStyle, NO);
document = CGPDFDocumentCreateWithURL(url);
CFRelease(path);
CFRelease(url);
return document;
}
@end
|
调用
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| RiderPDFView *view = [[RiderPDFView alloc]initWithFrame:CGRectMake(0, 60, self.view.frame.size.width, 300)];
[self.view addSubview:view];
|
参考资料
iOS–PDF
