下载图片时的进度条
我将如何添加进度条来下载大图像或任何与此相关的文件？这是我的代码：
NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *docsPath = [paths objectAtIndex:0];
NSString *downloadPath = [[[NSString alloc]initWithFormat:@"http://www.zzz.com/%@.jpg",chartFileName]autorelease];
NSString *savePath = [[[NSString alloc]initWithFormat:@"%@/%@.jpg",docsPath, chartFileName]autorelease];
NSURL *url = [[NSURL alloc]initWithString:downloadPath];
NSData *downloadedChartData = [NSData dataWithContentsOfURL:url];
[url release];
[downloadedChartData writeToFile:savePath atomically:YES];
How would I go about adding a progress bar for downloading a large image, or any file for that matter? here is my code:
NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *docsPath = [paths objectAtIndex:0];
NSString *downloadPath = [[[NSString alloc]initWithFormat:@"http://www.zzz.com/%@.jpg",chartFileName]autorelease];
NSString *savePath = [[[NSString alloc]initWithFormat:@"%@/%@.jpg",docsPath, chartFileName]autorelease];
NSURL *url = [[NSURL alloc]initWithString:downloadPath];
NSData *downloadedChartData = [NSData dataWithContentsOfURL:url];
[url release];
[downloadedChartData writeToFile:savePath atomically:YES];
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您可以在 NSURLConnection 调用中覆盖 connection:didReceiveData: 。请参阅此处了解更多信息：
如何将 NSURLConnection 与 UIProgressView 集成？
You could override connection:didReceiveData: in your NSURLConnection call. See here for more:
How to integrate NSURLConnection with UIProgressView?
在后台运行选择器来检查图像的下载大小，并将其与所需的大小进行比较。然后将进度条的百分比设置为已下载/需要。
Run a selector in the background that checks the image's download size, and compares it against the required size. Then set the % of the progress bar to downloaded/required.