如何下载PDF并将其存储在iPhone本地？ [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，它将检查在线PDF的日期。如果它比本地存储的PDF更新，应用程序将下载新的PDF，否则它将打开本地存储的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;

我怎么能实现这个目标？

How am I able to achieve this?

推荐答案

我找到了一个自己试过的方法：

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];

这将在本地存储您的PDF并将其加载到您的UIWebView中。

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

希望这可以解决您的问题。

Hope this solves your problem.

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