ios - PopupViewController returns null to ViewController -

i pass datepicker.date datepickerpopupviewcontroller sensorvviewcontroller shown below. however, returns me "null". doing wrong? code follows:

#import "datepopoverviewcontroller.h"  @interface datepopoverviewcontroller ()  @end  @implementation datepopoverviewcontroller @synthesize datepicker; - (id)initwithnibname:(nsstring *)nibnameornil bundle:(nsbundle *)nibbundleornil {     self = [super initwithnibname:nibnameornil bundle:nibbundleornil];     if (self) {         // custom initialization     }     return self; }  - (void)viewdidload {     [super viewdidload];     // additional setup after loading view nib.     datepicker.date=[nsdate date]; }    @end  #import "sensorviewcontroller.h"  @interface sensorviewcontroller ()  @end // represent button triggers popupviewcontroller  -(void)choosedate {      if([popovercontroller ispopovervisible])     {     [popovercontroller dismisspopoveranimated:yes];      }     else     {         cgrect poprect=cgrectmake (900,1,1,1);         //cgrect poprect=cgrectmake (tools.frame.origin.x,tools.frame.origin.y,50,50);         popovercontroller.popovercontentsize =cgsizemake(320,216);         [popovercontroller presentpopoverfromrect:poprect inview:self.view permittedarrowdirections:uipopoverarrowdirectionup animated:yes];         datepop=[[datepopoverviewcontroller alloc]init];         nsdate *ali= datepop.datepicker.date;         nslog(@"%@",ali);     }  }     @end 

this code:

    cgrect poprect=cgrectmake (900,1,1,1);     //cgrect poprect=cgrectmake (tools.frame.origin.x,tools.frame.origin.y,50,50);     popovercontroller.popovercontentsize =cgsizemake(320,216);     [popovercontroller presentpopoverfromrect:poprect inview:self.view permittedarrowdirections:uipopoverarrowdirectionup animated:yes];     datepop=[[datepopoverviewcontroller alloc]init];     nsdate *ali= datepop.datepicker.date;     nslog(@"%@",ali); 

should more like:

    popovercontroller=[[datepopoverviewcontroller alloc]init];      cgrect poprect=cgrectmake (900,1,1,1);     //cgrect poprect=cgrectmake (tools.frame.origin.x,tools.frame.origin.y,50,50);     popovercontroller.popovercontentsize =cgsizemake(320,216);     [popovercontroller presentpopoverfromrect:poprect inview:self.view permittedarrowdirections:uipopoverarrowdirectionup animated:yes]; 

and should setup delegate relationship or block callback when user has selected date method called , can do:

nsdate *ali= popovercontroller.datepicker.date; nslog(@"%@",ali); 

or, better, popover controller gets date picker , passes parameter callback method / block.

---

something (typed inline):

in popover:

typedef void (^completionblock) ();  @propertty (copy, nonatomic) completionblock completionblock;   - (void)dateselected {     self.completion(); } 

in source controller:

self.popovercontroller.completionblock = ^{     nslog(@"%@", self.popovercontroller.datepicker.date); };