objective c - Unable to add string into an mutable array -

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i trying upload assignments table in different view controller. first when click on upload button code runs.

- (ibaction)uploadassignment:(id)sender {     nameofassignmentasstring = self.nameofassignment.text;     nslog(@"%@", nameofassignmentasstring);     nsinteger row;     row = [self.subjectpicker selectedrowincomponent:0];     subjectofassignmentasstring = [subjectarray objectatindex:row];     nslog(@"%@", subjectofassignmentasstring);     nsdate *deadline = [self.deadlinepicker date];     nsdateformatter *dateformat = [[nsdateformatter alloc] init];     [dateformat setdateformat:@"dd/mm/yyyy"];     deadlineofassignmentasstring = [dateformat stringfromdate:deadline];     nslog(@"%@",deadlineofassignmentasstring);      homeworkviewcontroller *hvc;     [hvc.nameofassignmentinanarray addobject:nameofassignmentasstring];     [hvc.subjectofassignmentinanarray addobject:subjectofassignmentasstring];     [hvc.deadlineofassignmentinanarray addobject:deadlineofassignmentasstring];     nslog(@"%@",hvc.nameofassignmentinanarray.count); }

then in homeworkviewcontroller.h code

@interface homeworkviewcontroller : uiviewcontroller <uigesturerecognizerdelegate,uitableviewdatasource,uitableviewdelegate> {      int i; } @property (strong, nonatomic) iboutlet uiview *mainmenu; @property (strong, nonatomic) iboutlet uibutton *homeworkbutton; @property (strong, nonatomic) iboutlet uibutton *uploadbutton; @property (strong, nonatomic) nsmutablearray *nameofassignmentinanarray; @property (strong, nonatomic) nsmutablearray *subjectofassignmentinanarray; @property (strong, nonatomic) nsmutablearray *deadlineofassignmentinanarray;

i did initialise in homeworkviewcontroller.m file. reason string not being added array.

you declare hvc never assign value it. therefore cannot hold in itself. reason designers of objective-c decided it's not error send messages nil objects, might not noticed.


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