目标C：下载时的进度条

Question

我正在制作一款应用程序，可通过按钮单击下载PDF文件并通过应用程序的沙箱将其保存到本地。

现在，我想在下载过程中放置​​一个进度条，我将如何能够做到这一点？

我已成功地做下载和使用此代码的文件的查看...

存储数据：

NSData *pdfData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:@"http://mywebsite.com/products/download/file.pdf"]]; 

    NSString *resourceDocPath = [[NSString alloc] initWithString:[[[[NSBundle mainBundle] resourcePath] stringByDeletingLastPathComponent] stringByAppendingPathComponent:@"Documents"]]; 

    filePath = [resourceDocPath stringByAppendingPathComponent:@"myPDF.pdf"]; 

    [pdfData writeToFile:filePath atomically:YES]; 

文件查看：

UIWebView *pdfFileView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 768, 1024)]; 
    pdfFileView.delegate = self; 
    pdfFileView.backgroundColor = [UIColor clearColor]; 
    pdfFileView.opaque = NO; 
    pdfFileView.userInteractionEnabled = YES; 
    [self.view addSubview:pdfFileView]; 

    NSURL *url = [NSURL fileURLWithPath:filePath]; 

    NSURLRequest *requestObj = [NSURLRequest requestWithURL:url]; 

    [pdfFileView loadRequest:requestObj]; 

Answer 1

试试这个演示用于与进度条下载

NPRImageview

当您下载两个文件夹文件可能会丢失，并给您一个错误。在这里下载

https://github.com/nicnocquee/NPRImageView/