如何在我的Documents目录中存储加载到UIWebView的pdf文件?

时间:2012-02-20 06:56:59

标签: objective-c ios uiwebview

目前,我检测UIWebView是否通过检查当前URL来加载pdf文件。接下来,我使用ASIHTTPRequest库下载pdf文件。问题是,如果文件显示在UIWebView中,它是否已经在某处下载,所以我下载了这个文件两次。如何在我的UIWebView中加载此文件?

目的是将我的UIWebView中加载的文件存储在我的Document目录中。

2 个答案:

答案 0 :(得分:1)

以下是如何在iphone应用程序中本地下载,阅读和存储您的pdf,以便您无需定期下载:

首先创建UIWebView并包含<< UIWebViewDelegate >>

  NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
  NSString *documentsPath = [paths objectAtIndex:0];
  NSString *filePath = [documentsPath stringByAppendingPathComponent:@"YourPDF.pdf"]; 
 if(![[NSFileManager defaultManager] fileExistsAtPath:filePath]){ // if file not present
           // download file , here "https://s3.amazonaws.com/hgjgj.pdf" = pdf downloading link
         NSData *pdfData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:@"https://s3.amazonaws.com/hgjgj.pdf"]];
            //Store the downloaded file  in documents directory as a NSData format
         [pdfData writeToFile:filePath atomically:YES];
    }

     NSURL *url = [NSURL fileURLWithPath:filePath];
     NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
     [yourWebView setUserInteractionEnabled:YES];
     [yourWebView setDelegate:self];
     yourWebView.scalesPageToFit = YES;
     [yourWebView loadRequest:requestObj];

或者,如果您只是想从资源文件夹中读取/加载pdf,那么只需执行以下操作:

     NSString*  filePath= [[NSBundle mainBundle] pathForResource:@"sample" ofType:@"pdf"]];
    /// or you can even read docs file as : pathForResource:@"sample" ofType:@"docx"]
     NSURL *url = [NSURL fileURLWithPath:filePath];
     NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
     [yourWebView setUserInteractionEnabled:YES];
     [yourWebView setDelegate:self];
     yourWebView.scalesPageToFit = YES;
     [yourWebView loadRequest:requestObj];

答案 1 :(得分:0)

我可以建议的是要么第二次下载它,要么把它放在临时存储中,然后把它放在UIWebView上,当用户询问时,然后将它放在你想要的临时存储中。