如何下载 PDF 并将其本地存储在 iPhone 上? [英] How to download PDF and store it locally on iPhone?

问题描述

我能够从网站成功查看 PDF.我希望能够将该 PDF 下载到设备，然后在本地访问该文件.

I am able to successfully view a PDF from a website. I want to be able to download that PDF to the device, then access that file locally.

当应用程序打开时，它会检查在线 PDF 的日期.如果它比本地存储的 PDF 新，应用将下载新的 PDF，否则打开本地存储的 PDF.

When the app is opened, it will check the online PDF's date. If it is newer than the locally-stored PDF, the app will download the new one, otherwise it opens the locally-stored PDF.

我目前使用的代码:

PDFAddress = [NSURL URLWithString:@"http://www.msy.com.au/Parts/PARTS.pdf"];
request = [NSURLRequest requestWithURL:PDFAddress];
[webView loadRequest:request];
webView.scalesPageToFit = YES;

我如何才能做到这一点?

How am I able to achieve this?

推荐答案

我找到了一种我自己尝试过的方法:

I have found one method which I tried myself:

// Get the PDF Data from the url in a NSData Object
NSData *pdfData = [[NSData alloc] initWithContentsOfURL:[
    NSURL URLWithString:@"http://www.example.com/info.pdf"]];

// Store the Data locally as PDF File
NSString *resourceDocPath = [[NSString alloc] initWithString:[
    [[[NSBundle mainBundle] resourcePath] stringByDeletingLastPathComponent]
        stringByAppendingPathComponent:@"Documents"
]];

NSString *filePath = [resourceDocPath 
    stringByAppendingPathComponent:@"myPDF.pdf"];
[pdfData writeToFile:filePath atomically:YES];


// Now create Request for the file that was saved in your documents folder
NSURL *url = [NSURL fileURLWithPath:filePath];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];

[webView setUserInteractionEnabled:YES];
[webView setDelegate:self];
[webView loadRequest:requestObj];

这会将您的 PDF 存储在本地并将其加载到您的 UIWebView 中.

This will store your PDF locally and load it into your UIWebView.

这篇关于如何下载 PDF 并将其本地存储在 iPhone 上?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！