[英]How to control page display to PDF loaded in UIWebView for iOS (go to page)
我正在开发一个应用程序,它显示嵌入在WebView中的PDF,这是我的代码:
- (void)viewDidLoad
{
[super viewDidLoad];
NSURL *urlremoto = [NSURL URLWithString:@"https://developer.apple.com/library/ios/documentation/userexperience/conceptual/TransitionGuide/TransitionGuide.pdf"];
request = [NSURLRequest requestWithURL:urlremoto];
[self.webView loadRequest:request];
[self.webView setScalesPageToFit:YES];
}
-(void)webViewDidStartLoad:(UIWebView *)webView{
[self.activityIndicator startAnimating];
}
-(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error{
//TODO: describir el error
[self.activityIndicator stopAnimating];
}
-(void)webViewDidFinishLoad:(UIWebView *)webView{
[self.activityIndicator stopAnimating];
}
现在我想触摸一个按钮并将我加载的PDF更改为某个页面,我正在寻找能够实现此目的的东西,但仍然无法正常工作
在此先感谢您的支持
它很晚但可能会有帮助,
对于低于11.0的iOS
func webViewDidFinishLoad(_ webView: UIWebView)
{
var pdfPageHeight:CGFloat = 0
let a = webView.scrollView.subviews
for var view in a
{
if view.isKind(of: NSClassFromString("UIWebPDFView")!)
{
let b = view.subviews
for var iview in b
{
if iview.isKind(of: NSClassFromString("UIPDFPageView")!)
{
pdfPageHeight = iview.bounds.size.height
break
}
}
}
}
webView.scrollView.setContentOffset(CGPoint(x: 0, y: CGFloat((pagenumber - 1) + 1 )*pdfPageHeight), animated: true)
}
适用于iOS 11及更高版本
var pdfdocumentURL: URL?
@IBOutlet weak var titleLbl: UILabel!
@IBOutlet weak var pdfview: PDFView!
var pagenumber = 1
override func viewDidLoad()
{
super.viewDidLoad()
self.titleLbl.text = titleStr
let pdfdocument = PDFDocument(url: pdfdocumentURL!)
pdfview.document = pdfdocument
pdfview.displayMode = PDFDisplayMode.singlePageContinuous
pdfview.autoScales = true
pagenumber = pagenumber - 1
if let page = pdfdocument?.page(at: pagenumber) {
pdfview.go(to: page)
}
}
此刻我认为你可以使用两种方法:
使用scrollView“导航,通过PDF:
[[webView scrollView] setContentOffset:CGPointMake(0,y)animated:YES];
//例如,跳转到页面高度为1000像素的PDF文档中的第5页:
int selectedPag = 5; // ie Go to page 5 float pageHeight = 1000.0; // ie Height of PDF page = 1000 px; float y = pageHeight * selectedPag; [[webView scrollView] setContentOffset:CGPointMake(0,y) animated:YES];
拆分PDF单页。
正如RFG所说,使用webview的scrollview是完美的,关键的一步是找出pdf页面的高度,下面的代码将获得pdf文件的整个高度和pdf文件的页面数量。然后我们得到它!
第一种方式:
//get the total height
CGFloat pageHeight = self.webView.scrollView.contentSize.height;
//get page nums
-(NSInteger)getTotalPDFPages:(NSString *)strPDFFilePath
{
NSURL *pdfUrl = [NSURL fileURLWithPath:strPDFFilePath];
CGPDFDocumentRef document = CGPDFDocumentCreateWithURL((CFURLRef)pdfUrl);
size_t pageCount = CGPDFDocumentGetNumberOfPages(document);
return pageCount;
}
第二种方式:
//get the content info
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
[self.okBtn setEnabled:YES];
[self.signPdfBtn setEnabled:YES];
NSArray* a = [self.webView.scrollView subviews];
for (UIView* view in a) {
if ([view isKindOfClass:NSClassFromString(@"UIWebPDFView")]) {
NSArray* b = view.subviews;
self.content_hetght = view.bounds.size.height;
self.content_num = b.count;
}
}
}
//then you can jump any page,like the last page
[self.webView.scrollView setContentOffset:CGPointMake(0, (self.content_num-1)*(self.content_hetght*1.0 /self.content_num)) animated:YES];
Swift 3版本:
let selectedPag: CGFloat = 5; // i.e. Go to page 5
let pageHeight: CGFloat = 1000.0; // i.e. Height of PDF page = 1000 px;
let y: CGFloat = pageHeight * selectedPag;
let pageOffset = CGPoint(x: 0, y: y)
WebViewMore.scrollView.setContentOffset(pageOffset, animated: true)
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