ios教程lwxshow.com-PDF的显示和浏览

转自:https://lwxshow.com/post/1135.html

1.使用webview来加载显示

这里只是能预览查看.

-(void)loadDocument:(NSString *)documentName inView:(UIWebView *)webView
{
    NSString *path = [[NSBundle mainBundle] pathForResource:documentName ofType:nil];
    NSURL *url = [NSURL fileURLWithPath:path];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [webView loadRequest:request];
}

2.使用CGContextDrawPDFPage来实现

CGPDFDocumentRef GetPDFDocumentRef(NSString *filename)
{
    CFStringRef path;
    CFURLRef url;
    CGPDFDocumentRef document;
    size_t count;
    
    path = CFStringCreateWithCString (NULL, [filename UTF8String], kCFStringEncodingUTF8);
    url = CFURLCreateWithFileSystemPath (NULL, path, kCFURLPOSIXPathStyle, 0);
    
    CFRelease (path);
    document = CGPDFDocumentCreateWithURL (url);
    CFRelease(url);
    count = CGPDFDocumentGetNumberOfPages (document);
    if (count == 0) {
        printf("[%s] needs at least one page!\n", [filename UTF8String]);
        return NULL; 
    } else {
        printf("[%ld] pages loaded in this PDF!\n", count);
    }
    return document;
}

void DisplayPDFPage (CGContextRef myContext, size_t pageNumber, NSString *filename)
{
    CGPDFDocumentRef document;
    CGPDFPageRef page;
    
    document = GetPDFDocumentRef (filename);
    page = CGPDFDocumentGetPage (document, pageNumber);
    CGContextDrawPDFPage (myContext, page);
    CGPDFDocumentRelease (document);
}

这样显示出来的pdf是倒立的，Quartz坐标系和UIView坐标系不一样所致，调整坐标系，修改代码如下：

    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextTranslateCTM(context, 80, self.frame.size.height-60);
    CGContextScaleCTM(context, 1, -1);

效果如下: