Global variable in Objective-C in ios proj -

i want create global variable coordinates uiview how correct syntax this?

first need create nsobject class

give class name globalshareclass

globalshareclass.h

#import <foundation/foundation.h> @interface globalshareclass : nsobject  { } @property (nonatomic) float xvalue @property (nonatomic) float yvalue + (globalshareclass *)sharedinstance; @end 

globalshareclas.m

#import "globalshareclass.h" static globalshareclass *_shareinstane; @implementation globalshareclass @synthesize xvalue; @synthesize yvalue;  + (globalshareclass *)sharedinstance  {   if (_shareinstane == nil)   {       _shareinstane = [[globalshareclass alloc] init];   }   return _shareinstane; } 

viewcontroller.h

#import <uikit/uikit.h> #import "globalshareclass.h"  @interface viewcontroller : uiviewcontroller {   globalshareclass *globalshare; } @end; 

viewcontroller.m

#import "viewcontroller.h" @interface viewcontroller () @end @implementation viewcontroller  - (void)viewdidload {   [super viewdidload];   // additional setup after loading view, typically nib.   globalshare = [globalshareclass sharedinstance];   globalshare.xvalue = 50.0;   globalshare.xvalue = 100.0;  }