我有一个应用程序,我正在从网址打开PDF文件。
我成功地在网络视图中打开它。
现在我想下载该PDF文件并将其保存在我的文档文件夹中,并希望将该PDF文件发送到我的邮件中。
我搜索了很多,并在下面找到了最佳解决方案。
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0];
NSString *filePath = [documentsPath stringByAppendingPathComponent:@"myfile.pdf"];
if(![[NSFileManager defaultManager] fileExistsAtPath:filePath]){
NSData *pdfData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:@"http://developer.apple.com/iphone/library/documentation/UIKit/Reference/UIWebView_Class/UIWebView_Class.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];
[webView setUserInteractionEnabled:YES];
[webView setDelegate:self];
webView.scalesPageToFit = YES;
[webView loadRequest:requestObj];
但是当我尝试这段代码时,它给我错误说找不到 PDF 标题:"%PDF"找不到
我什至无法打开我的 PDF。
我知道以前问过同样的问题,但我现在无法解决这个错误。
我不知道我在这里做错了什么。
很抱歉给您带来不便。
请帮我解决这个问题。
尝试使用此代码下载和保存您的 PDF 文件
UIActivityIndicatorView *indicator=[[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
[indicator startAnimating];
NSLog(@"Downloading Started");
NSString *urlToDownload = @"http://gradcollege.okstate.edu/sites/default/files/PDF_linking.pdf";
NSURL *url = [NSURL URLWithString:urlToDownload];
NSURLRequest *request=[[NSURLRequest alloc] initWithURL:url cachePolicy:NSURLCacheStorageAllowed timeoutInterval:120.0f];
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
[indicator stopAnimating];
if (!connectionError) {
if ( data )
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [NSString stringWithFormat:@"%@/%@", documentsDirectory,@"myfile.pdf"];
//saving is done on main thread
dispatch_async(dispatch_get_main_queue(), ^{
[data
writeToFile:filePath atomically:YES];
NSLog(@"File Saved !");
NSURL *url = [NSURL fileURLWithPath:filePath];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
[_rssWebView setUserInteractionEnabled:YES];
//[_rssWebView setDelegate:self];
[_rssWebView loadRequest:requestObj];
});
}
}
}];
如果转换为字符串服务器响应,你在NSData *pdfData
中得到,你将看到接下来:
<!DOCTYPE html>
<html>
<head>
<title>iOS Developer Library</title>
<meta charset="utf-8">
<script>
var content_page = "navigation";
var href = window.location.href;
if (window.location.href.match('#')) {
var newhref = href.replace('#', '');
newhref = newhref.replace('%23', '#');
window.location.href = newhref;
}
else {
console.log(content_page);
console.log(content_page.match("content_page"));
if(content_page.match("content_page")) {
window.location.href = './navigation';
}
else {
window.location.href = "./" + content_page;
}
}
</script>
</head>
<body>
</body>
<script type="text/javascript" src="/library/webstats/pagetracker.js"></script>
<script type="text/javascript">
if(typeof PageTracker !== 'undefined') {
if(window.addEventListener) {
window.addEventListener("load", function(){PageTracker.logPageLoad()},false);
} else if(window.attachEvent) {
window.attachEvent("onload",function(){PageTracker.logPageLoad()});
}
}
</script>
</html>
这个唯一的网页,正如我可以假设的那样,它将使用另一个 URI 将您转发到文档: https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIWebView_Class/UIWebView_Class.pdf
.因此,如果要下载文件.pdf则必须使用此网址
另外,注意@pawan的答案,并使用他的方法避免在主线程中下载文件