我的视图上有一个带有附带标签的进度条,并且正在尝试显示文件下载的进度。到目前为止,这是我的代码
-(void)downloadXML {
if(responseData == nil) {
responseData = [[NSMutableData alloc] init];
}
progressView.progress = 0;
NSString* updateURL = [NSString stringWithFormat:@"http://www.myserver.com/file.xml"];
responseData = [[NSMutableData alloc] init];
NSURLRequest* updateRequest = [NSURLRequest requestWithURL: [NSURL URLWithString:updateURL]];
NSURLConnection* connection = [[NSURLConnection alloc] initWithRequest:updateRequest delegate:self];
[connection start];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[responseData setLength:0];
filesize = [[NSNumber numberWithLong: [response expectedContentLength] ] retain];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[responseData appendData:data];
NSNumber* curLength = [NSNumber numberWithLong:[responseData length] ];
float progress = [curLength floatValue] / [filesize floatValue] ;
NSString *labelText = [NSString stringWithFormat:@"Downloading file: %@%", domicile, progress];
progressView.progress = progress;
progressLabel.text = labelText;
NSLog(@"File Size: %f, Download Progress: %f", [filesize floatValue], progress);
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection{
progressView.progress = 0;
[filesize release];
[connection release];
}
实际下载工作正常,但进度条和标签似乎不太正常。控制台输出看起来像这样,表明文件正在正确下载。
2010-11-18 15:46:51.141 Fund Prices[8096:207] File Size: 1300.000000, Download Progress: 0.318615
2010-11-18 15:46:51.141 Fund Prices[8096:207] File Size: 1300.000000, Download Progress: 0.427615
2010-11-18 15:46:51.141 Fund Prices[8096:207] File Size: 1300.000000, Download Progress: 0.651215
2010-11-18 15:46:51.274 Fund Prices[8096:207] File Size: 1300.000000, Download Progress: 1.000000
但是,进度条和标签只更新到倒数第二个值。即,该条将前进到刚刚超过一半,并且标签将更新为 0.651215。
是否有任何理由没有将最终值发送到这两个项目?