在我的 iPad 中保存 PDF 的问题

Question

在我的应用程序中，我从网络服务获取我的 PDF 作为 URL。现在我想将它存储在我的 iPad 中并在 adobe Reader App 中打开。我使用以下代码保存它并在 webView 中打开它

NSData *pdfData = [[NSData alloc] initWithContentsOfURL:[
                                                         NSURL URLWithString:socialURLString]];

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

NSString *filePath = [resourceDocPath
                      stringByAppendingPathComponent:@"pdfOne.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];

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

现在假设它存储在我的 iPad 中，我打开 Adob​​e Reader 应用程序并没有显示 PDF。我做错了什么？

Answer 1

资源包是一个只读目录及其内容文件。所以你应该将文件写入临时目录或某个缓存目录中

////In temporary directory
NSString *tmpFilePath = [NSString stringWithFormat:@"%@/%@.pdf",NSTemporaryDirectory(),@"pdfOne"];

NSString * filePath = tmpFilePath;

或

///In caches directory.
    NSString *cacheDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0]; 
    NSString *tmpFilePath = [NSString stringWithFormat:@"%@/%@.pdf",cacheDirectoryPath,@"pdfOne"];

    NSString * filePath = tmpFilePath;