如何控制在UIWebView for iOS中加载的页面显示为PDF（转到页面） [英] How to control page display to PDF loaded in UIWebView for iOS (go to page)

问题描述

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：

I'm developing an app which displays a PDF embedded in a WebView this is my code:

- (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，将我加载的PDF更改为某个页面，我正在寻找能够实现这一目标的东西，但仍然无法正常工作

Now I want to touch a button and change my loaded PDF to certain page, I'm looking for something to achieve this but still got nothing working

提前感谢支持

推荐答案

此时我认为你可以使用两种方法：

At this moment I think you can use two approaches:

1. 使用scrollView来'导航，通过PDF：

1. Use scrollView to 'navigate, through PDF:

[[webView scrollView] setContentOffset：CGPointMake（0，y）animated：YES];

[[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：

// For example, jumping to page 5 in a PDF document with 1000 px page height:

int selectedPag = 5; // i.e. Go to page 5

float pageHeight = 1000.0; // i.e. Height of PDF page = 1000 px;

float y = pageHeight * selectedPag;

[[webView scrollView] setContentOffset:CGPointMake(0,y) animated:YES];

拆分PDF单页。

Split PDF individual pages.

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