保存由UIWebView本地显示的PDF [英] Save PDF which is displayed by UIWebView locally

问题描述

我有一个带有 UIWebView 的 UIViewController ，它显示了一个pdf文件，该文件取决于之前在的UITableView 。现在我想为用户添加一个按钮，以便在本地保存此pdf文件以供离线使用。
然后还有第二个 UITableView ，它应该显示已保存的pdf的名称，然后点击另一个 UIViewController 出现并在 UIWebView 离线显示保存的pdf。
什么是好的开始？
谢谢

I have a UIViewController with an UIWebView which displays a pdf file depending which row was clicked before in an UITableView. Now I want to add a button for the user to save this pdf file locally for offline use. Then there is a second UITableView which should display the name of the saved pdf and by clicking on it another UIViewController appears and displays the saved pdf on a UIWebView offline. What would be a good way to start? Thanks

推荐答案

您可以尝试这种方式：

1）添加一个按钮到查看包含 UIWebView

2）按下按钮保存<$ c $中显示的文件c> UIWebView

（注意：在iOS 5中，您必须保存可以轻松重新创建或下载到缓存目录的数据）

You can try this way:
1) Add a button to the View containing UIWebView
2) At button press save the file shown in UIWebView
(note: in iOS 5 you must save data that can be easily recreated or downloaded to the caches directory)

- (IBAction)buttonPress:(id)sender
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    NSString *cachePath = [paths objectAtIndex:0];
    BOOL isDir = NO;
    NSError *error;
    //You must check if this directory exist every time
    if (! [[NSFileManager defaultManager] fileExistsAtPath:cachePath isDirectory:&isDir] && isDir   == NO)
    {
        [[NSFileManager defaultManager] createDirectoryAtPath:cachePath withIntermediateDirectories:NO attributes:nil error:&error];
    }
    NSString *filePath = [cachePath stringByAppendingPathComponent:@"someName.pdf"]
    //webView.request.URL contains current URL of UIWebView, don't forget to set outlet for it
    NSData *pdfFile = [NSData dataWithContentsOfURL:webView.request.URL];
    [pdfFile writeToFile:filePath atomically:YES];
}

3）在应用程序启动时，您需要检查存储的文件（iOS可以如果iPhone上没有足够的空间，请删除缓存目录）

3) On application start you need to check what files are stored (iOS can delete cache directory if there is not enough space on iPhone)

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