Failed to find PDF header: `%PDF' not found.

她的代码：

- (void)viewDidLoad
{


    [webview loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://webdesign-schoenefeld.de/es-app/heute.pdf"]]];
    NSLog(@"---------------pdfloading....,------------------------");
    [webview addSubview:activityind];
    timer = [NSTimer scheduledTimerWithTimeInterval:(1.0/2.0)
                                             target:self
                                           selector:@selector(loading)
                                           userInfo:nil
                                            repeats:YES];
    [super viewDidLoad];
    // Do any additional setup after loading the view,typically from a nib.

}

我使用Xcode 6 Beta 5和iOS 8 beta 5.

谢谢你的帮助.