[[UIApplication sharedApplication] openURL:[NSURL URLWithString:wechatDownloadUrl]];//打开url相应的app
//导航栏高度
CGRect rectStatus = [[UIApplication sharedApplication] statusBarFrame]; UINavigationBar *bar = [self.navigationController navigationBar];
CGFloat statusHeight = rectStatus.size.height;
CGFloat barHeight = bar.frame.size.height;
_NavHeight = barHeight + statusHeight;
