大部分schemes 都必须在微信内部才能打开，除了

weixin://  wechat://   etc  直接打开微信

weixin://scanqrcode   打开微信扫一扫

NSURL * url = [NSURL URLWithString:@"wechat://etc"];

[[UIApplication sharedApplication] openURL:url];

支付宝跳过开启动画打开扫码和付款码的 url scheme 分别是

alipayqr://platformapi/startapp?saId=10000007          跳去支付宝扫一扫

alipayqr://platformapi/startapp?saId=20000056         跳去支付宝付款码

NSURL * url = [NSURL URLWithString:@"alipayqr://platformapi/startapp?saId=10000007"];

[[UIApplication sharedApplication] openURL:url];

下载地址：https://github.com/tangyinnnn/push_weixin_alipay