how to load pdf file in UIWebview center - iphone

Question

I am new in ios developement.I am trying to display a pdf in a UIWebview center.i have a pdf in mainbundle.Here is what my PDF looks like now when loaded in a UIWebView: (I put in a brown gradient as the UIWebView's background so you can see what I mean better).
- (void)viewDidLoad
{
UIWebView *theWebView = [[UIWebView alloc] initWithFrame:[self.view bounds]];
[theWebView setContentMode:UIViewContentModeScaleAspectFit];
[theWebView setAutoresizingMask:UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth];
[theWebView setScalesPageToFit:YES];
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"test" ofType:#"pdf"];
NSURL *filePathURL = [NSURL fileURLWithPath:filePath];
[theWebView loadRequest:[NSURLRequest requestWithURL:filePathURL]];
[self.view addSubview:theWebView];
[super viewDidLoad];
}
I would like to centre that so that the bottom margin is the same as the top margin. How would I do this with a PDF (local)?

Answer 1

CGRect rect = [[UIScreen mainScreen] bounds];
CGSize screenSize = rect.size;
UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(0,0,screenSize.width,screenSize.height)];
NSString *path = [[NSBundle mainBundle] pathForResource:#"pdf" ofType:#"pdf"];
NSURL *targetURL = [NSURL fileURLWithPath:path];
NSURLRequest *request = [NSURLRequest requestWithURL:targetURL];
[webView loadRequest:request];
[self.view addSubview:webView];

Answer 2

Not sure whether this is the ideal solution for your question.
First Get the width and height of PDF==>
float width = CGPDFPageGetBoxRect(PageRef, kCGPDFMediaBox).size.width;
float height = CGPDFPageGetBoxRect(PageRef, kCGPDFMediaBox).size.height;
where Pageref is the PDF page reference.
CGSize pdfSize = CGSizeMake(width, height);
//Create one superView to webview
UIView *supView = [[UIView alloc] initWithFrame:[self.view bounds]];
supView.backgroundColor=[UIColor colorWithRed:0.663 green:0.855 blue:0.341 alpha:1]
//Then webview
UIWebView *theWebView = [[UIWebView alloc] initWithFrame:CGRectMake(0,0, pdfSize.width, pdfSize.height)]];
[theWebView setContentMode:UIViewContentModeScaleAspectFit];
[theWebView setAutoresizingMask:UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth];
[theWebView setScalesPageToFit:YES];
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"test" ofType:#"pdf"];
NSURL *filePathURL = [NSURL fileURLWithPath:filePath];
[theWebView loadRequest:[NSURLRequest requestWithURL:filePathURL]];
[supView addSubview: theWebView];
[self.view addSubview: supView];
EDIT:
Get Pageref(part),
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"test" ofType:#"pdf"];
NSURL *filePathURL = [NSURL fileURLWithPath:filePath];
CFURLRef pdfURL = (__bridge CFURLRef)[[NSURL alloc] initFileURLWithPath:filePath];
//file ref
CGPDFDocumentRef pdfDocRef = CGPDFDocumentCreateWithURL((CFURLRef) pdfURL);
CGPDFPageRef PageRef = CGPDFDocumentGetPage(pdfDocRef, 1);
float width = CGPDFPageGetBoxRect(page1, kCGPDFMediaBox).size.width;
float height = CGPDFPageGetBoxRect(page1, kCGPDFMediaBox).size.height;
NSLog(#"%f %f",height,width);