force:inputfield trigger events

Question

I am trying to trigger events in force:inputfield which is binded by Sobject lookup.How to identify value change of the field.I tried in two approach:

 <aura:registerEvent name="testEventFired" type="c:testevent"/>
 <aura:handler name="testEventFired" event="c:testevent" action="{!c.func}"/>
 <force:inputfield aura:id="Name" value="{!v.objectfieldbinding}" change="{!e.testEventFired}"/>
  testevent is component event
  2:
 <force:inputfield aura:id="Name" value="{!v.objectfieldbinding}"/>
   <aura:handler name="change" value="{!v.name}" action="{!c.func}"/>`

func will trigger a another component event in controller side.I cant able to bind the value of inputfield in handler beacause it is not attribute value

NewEdit: To brief you on the context more I am trying display table with team member based on the account selected in the component my code is here below:

<aura:registerEvent name="componentEventFired" type="c:Callevent"/>
<aura:attribute name="obj" type="csutomobjecttype" default="{ 'sobjectType': 'customobject' }"/>
<force:inputfield aura:id="Account" value="{!v.obj.Accountlookupfield}" change="{!c.evac}"/>
<aura:handler name="componentEventFired" event="c:Callevent" action="{!c.trigaction}"/>
event:
<aura:event type="Component" description="Event template">
<aura:attribute name="display" type="object"/>
</aura:event>
controller Js:
evac: function(component,event)
          {
            var  evva=component.find("Account").get("v.value");
            var compEvents = component.getEvent("componentEventFired");
            compEvents.setParams({ "display" : evva });
            compEvents.fire();

           },
        trigaction : function(component, event) {
        var context = event.getParam("display");
        var atmaction=component.get("c.getatm");
        atmaction.setParams({
            atr : context
        });
           atmaction.setCallback(this,function(a){
            //get the response state
            var state = a.getState();
            //check if result is successfull
            if(state == "SUCCESS"){
                component.set("v.at",a.getReturnValue());
                component.set("v.edit",true);
                alert('Success');
            } else if(state == "ERROR"){
                alert('Error in calling server side action');
            }
        }); 
        $A.enqueueAction(atmaction);
      }
})
Apex class:
public Id atr {get;set;}
@AuraEnabled
Public static List<AccountTeammember> getatm(string atr){
            List<AccountTeammember> atm = new List<AccountTeammember>();
            atm=[SELECT TeamMemberRole,UserId FROM AccountTeamMember where AccountId =:atr ];  
    return atm;
    }
}

Answer 1

Add change attribute which points to a controller method in the force:inputField component.

myApp.app:

<aura:application controller="AccountController" extends="force:slds">
   <aura:attribute name="contact" type="Contact" 
               default="{ 'sobjectType': 'Contact' }"/>
   <force:inputField aura:id="accountLookup" 
                 value="{!v.contact.AccountId}" change="{!c.inputChanged}"/> 
</aura:application>

myAppController.js:

({
    inputChanged : function(cmp, event, helper) {
        console.log('changed')
    },
})

FYI, force:inputField is noisy at the moment, you might get some weird errors while using it.