objective c - Can't access to extern variable from another class -


i've created phonegap plugin give variable native code. works fine. need access value other classes decided create extern nsstring.

.h 

extern nsstring  *lkwid;  @interface myplugin : cdvplugin {  }  @property (retain, nonatomic) nsstring *lkwid;     -(void) setmyvalue:(nsmutablearray*)arguments withdict:(nsmutabledictionary*)options;

.m

#import "myplugin.h"  @implementation myplugin  @synthesize lkwid;  nsstring *lkwid = @"";   -(void) setmyvalue:(nsmutablearray*)arguments withdict:(nsmutabledictionary*)options {     nsstring* callbackid = [arguments objectatindex:1];     lkwid = callbackid;     nslog(@"set value %@ ",lkwid);     //nslog shows correct value javascript }

now want access lkwid mainviewcontroller.m (myplugin.h imported) lkwid empty. why?

i think confusing instance variables , static (class) variables. extern nsstring *lkwid declares globally accessible variable. @property (retain,nonatomic) nsstring *lkwid declares instance variables object. if want set global variable, shared all instances, should not synthesize property andimplement getter , setter in following manner:

- (nsstring*) lkwid {     return lkwid; }  - (void) setlkwid:(nsstring*)value {     lkwid = value; }

make sure don't declare instance variable name lkwid.


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