iOS 调用支付宝App支付不回调问题

将delegate的processOrderWithPaymentResult回调standbyCallback设置成nil，就可以了

- (BOOL)application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary<NSString*, id> *)options
{
    //跳转支付宝钱包进行支付，处理支付结果
    if ([url.host isEqualToString:@"safepay"]) {
        [[AlipaySDK defaultService] processOrderWithPaymentResult:url standbyCallback:nil];
    }
    return YES;
}