NSURL * url = [NSURL URLWithString:@"weixin://scanQRCode"];
[[UIApplication sharedApplication] openURL:url options:@{} completionHandler:^(BOOL success) {
}];
NSURL * url = [NSURL URLWithString:@"weixin://scanQRCode"];
[[UIApplication sharedApplication] openURL:url options:@{} completionHandler:^(BOOL success) {
}];