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我正在尝试下载 1-2Mb 的小型 PDF 文件，最多 5 Mb。我正在研究 SelectionViewController.m 类，它有一个名为 progressBar 的 UIProgressView，它还实现了 NSURLConnectionDataDelegate 协议。

有趣的是，我的进度条突然从 0.0 变为 1.0。我想慢慢增加它，这样看起来不错。

这是我的代码：

    -(void)downloadPDFToMyDocumentsFrom:(NSString*) PDFUrl filename:(NSString *) title {

    NSURL *url = [[NSURL alloc] initWithString:PDFUrl];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];

    urlConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];

    NSLog(@"%@", self);

    fileName = [title stringByAppendingPathExtension:@"pdf"];
    filePath = [[SearchFeed pathToDocuments] stringByAppendingPathComponent:fileName];

}



 //handling incoming data
 -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)recievedData{

     if(self.data == nil)
     {
        self.data = [[NSMutableData alloc] initWithCapacity:2048];
     }

     [self.data appendData:recievedData];

     NSNumber *resourceLength = [NSNumber numberWithUnsignedInteger:[self.data length]];

     float progress = [resourceLength floatValue] /[fileLength floatValue];
     self.progressBar.progress = progress;

}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
    long length = [response expectedContentLength];
    fileLength = [NSNumber numberWithUnsignedInteger:length];
    //lastProgress = 0.0;
    //currentLength = 0.0;
    NSLog(@"%f ------------------------------------------------------- is the fileLength", [fileLength floatValue]);
}

    //handling connection progress

-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
    //WRITE code to set the progress bar to 1.0
    //self.progressBar.progress = 1.0;
    // [fileStream close];
    [self.data writeToFile:filePath atomically:YES];

    //[listFileAtPath:self.filePath];
    connection = nil;
    NSLog(@"%f %f-------------------------------------------- Finished Loading ", lastProgress, [fileLength floatValue]);
}

我已经放了一些 NSLog 语句来帮助我调试，它看起来像是一次下载。

这是所有 NSLog 的输出：

2013-09-05 20:30:04.856 Revista[63246:c07] <SelectionViewController: 0x7180000>
2013-09-05 20:30:04.859 Revista[63246:c07] 63561.000000 ------------------------------------------------------- is the fileLength
2013-09-05 20:30:04.861 Revista[63246:c07] 0.000000 63561.000000-------------------------------------------- Finished Loading

你们有什么想法如何让它分段下载并使进度条移动顺畅吗？

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1 回答 1

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没关系，我的网络太快了！这就是为什么我看不到正在进行的下载，因为它很快就会变亮。

感谢康卡斯特！

于 2013-09-06T01:57:50.187 回答