updated viewWillAppear to allow correct frame of app on ios 7

http://stackoverflow.com/questions/19209781/ios-7-status-bar-with-phoneg
ap

- (void)viewWillAppear:(BOOL)animated
{
// View defaults to full size.  If you want to customize the view's
size, or its subviews (e.g. webView),
// you can do so here.
//Lower screen 20px on ios 7
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7) {
    CGRect viewBounds = [self.webView bounds];
    viewBounds.origin.y = 20;
    viewBounds.size.height = viewBounds.size.height - 20;
    self.webView.frame = viewBounds;
}
[super viewWillAppear:animated];
}
error

error