swift2 Xcode7.0预期＆＃39;，＆＃39;分隔器

Question

if ( username.isEqualToString("")||
            useremail.isEqualToString("") ||userpassword.isEqualToString("")||
            userphonenumper.isEqualToString("")
            ){
            let alert = UIAlertController(title: "Sign Up Failed!", message:"Please enter your data", preferredStyle: .Alert)
            alert.addAction(UIAlertAction(title: ",ok", style: .Default) { _ in })
            self.presentViewController(alert, animated: true){}
        } 

我在运行应用程序时使用Xcode7和Swift2我收到此错误

if statment

中的错误

if ( username.isEqualToString("")||
            useremail.isEqualToString("") ||