phonegap3+，ios7+ 状态栏问题的解决

- (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.
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];
}