iOS中如何提取*，进入拨号界面？

 if ([UIApplication instancesRespondToSelector:@selector(canOpenURL:)]) {

        

        NSString *telephonNumber = @"手机号";

        NSURL *url = [NSURL fileURLWithPath:telephonNumber];

        

        if ([[UIApplication sharedApplication] canOpenURL:url]) {

            

            [[UIApplication sharedApplication] openURL:url];

        }

        

    }