cocoa - Drag Drop delegate for NSView could not set an attribute -

i using nsview delegate read dragged excel values. have subclassed nsview. code like-

@interface ssdragdropview : nsview     {         nsstring *texttodisplay;     }     @property(nonatomic,retain) nsstring *texttodisplay; // setters/getters      @synthesize texttodisplay;// setters/getters      @implementation ssdragdropview     - (nsdragoperation)draggingentered:(id <nsdragginginfo>)sender{         [self setneedsdisplay: yes];         return nsdragoperationgeneric;     }      - (void)draggingexited:(id <nsdragginginfo>)sender{         [self setneedsdisplay: yes];     }      - (bool)preparefordragoperation:(id <nsdragginginfo>)sender {         [self setneedsdisplay: yes];         return yes;     }      - (bool)performdragoperation:(id < nsdragginginfo >)sender {         nsarray *draggedfilenames = [[sender draggingpasteboard] propertylistfortype:nsfilenamespboardtype];         if ([[[draggedfilenames objectatindex:0] pathextension] isequal:@"xls"]){             return yes;         } else {             return no;         }     }      - (void)concludedragoperation:(id <nsdragginginfo>)sender{         nsarray *draggedfilenames = [[sender draggingpasteboard] propertylistfortype:nsfilenamespboardtype];         nsurl *url =   [nsurl fileurlwithpath:[draggedfilenames objectatindex:0]];        nsstring *textdatafile = [nsstring stringwithcontentsofurl:url usedencoding:nil error:nil]; //this text original excel text , getting displayed.     [self settexttodisplay:textdatafile];        } 

i setting textdatafile value string attribute of class. using ssdragdropview attribute value in other class like-

ssdragdropview *dragview = [ssdragdropview new];     nslog(@"dragview value %@",[dragview texttodisplay]);  

but getting null each time. can not set attribute value in delegate methods?

the above problem can resolved declaring global variable in ssdragdropview.h class.

#import <cocoa/cocoa.h> nsstring *mytexttodisplay; @interface ssdragdropview : nsview { 

the same can set inside desired delegate method

- (void)concludedragoperation:(id <nsdragginginfo>)sender {  // .... //your code nsstring *textdatafile = [nsstring stringwithcontentsofurl:url usedencoding:nil error:nil]; mytexttodisplay = textdatafile; // .... //your code } 

:)