objective-c - 带有 NSURLConnection 的 MBProgressHUD

Question

我试图将 MBProgressHUD 与 NSURLConnection 一起使用。

MBProgressHUD报表Demo工程中的例子:

- (IBAction)showURL:(id)sender {
    NSURL *URL = [NSURL URLWithString:@"https://github.com/matej/MBProgressHUD/zipball/master"];
    NSURLRequest *request = [NSURLRequest requestWithURL:URL];

    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    [connection start];
    [connection release];

    HUD = [[MBProgressHUD showHUDAddedTo:self.navigationController.view animated:YES] retain];
    HUD.delegate = self;
}



- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    expectedLength = [response expectedContentLength];
    currentLength = 0;
    HUD.mode = MBProgressHUDModeDeterminate;
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    currentLength += [data length];
    HUD.progress = currentLength / (float)expectedLength;
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    HUD.customView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"37x-Checkmark.png"]] autorelease];
    HUD.mode = MBProgressHUDModeCustomView;
    [HUD hide:YES afterDelay:2];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    [HUD hide:YES];
}

运行它，确定模式下的 HUD 旋转良好。

我试图实现这个，但是在这里

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
        currentLength += [data length];
        HUD.progress = currentLength / (float)expectedLength;
    }

圆圈是空的，没有填充。

不知道是不是跟请求的url的维度有关。

我请求从我的网站下载一个 plist (~80 kb)，但是圆圈一直是空的并且控制台报告

<Error>: void CGPathAddArc(CGPath*, const CGAffineTransform*, CGFloat, CGFloat, CGFloat, CGFloat, CGFloat, bool): invalid value for start or end angle.

我什至尝试这样做:

float progress = 0.0f;
    while (progress < 1.0f) {
        progress += 0.01f;
        HUD.progress = progress;
    }

但是现在圆圈已经完全填满了，没有做任何动画。

我认为这取决于请求的 url 的维度，但我不太确定，有人知道如何解决这个问题吗？

Answer 1

我这样解决了这个问题，从 NSURLRequest 切换到 NSMutableURLRequest 并将值 none 设置为编码(以前在 gzip 中)

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:anURL];
[request addValue:@"" forHTTPHeaderField:@"Accept-Encoding"];