ios - Change UIScrollView reference programmatically -

i have class called packages creates uiscrollview.

i have getter class , once called, returns uiscroll view.

i main application set scroll view 1 returned app. here code returns scroll view:

myclass.m

-(uiscrollview *)makescrollview{      cgfloat hue = ( arc4random() % 256 / 256.0 );  //  0.0 1.0     cgfloat saturation = ( arc4random() % 128 / 256.0 ) + 0.5;  //  0.5 1.0, away white     cgfloat brightness = ( arc4random() % 128 / 256.0 ) + 0.5;  //  0.5 1.0, away black     uicolor *color = [uicolor colorwithhue:hue saturation:saturation brightness:brightness alpha:1];      [self.scrollview setbackgroundcolor:color];      [self.scrollview setindicatorstyle:uiscrollviewindicatorstylewhite];     [self.scrollview setpagingenabled : no];     [self.scrollview setcancancelcontenttouches:yes];     [self.scrollview setuserinteractionenabled:yes];      self.scrollview.scrollenabled = true;     self.scrollview.bounces = true;     self.scrollview.contentsize = cgsizemake([uiscreen mainscreen].bounds.size.width, [uiscreen mainscreen].bounds.size.height);     self.scrollview.userinteractionenabled = yes;     cgfloat xorigin = 0;      int numberofviews = [self.picturearray count];   //    uiimageview *imageview1;     int = 0;     for(nsstring *item in self.picturearray){          uiimageview *imageview1;         uitapgesturerecognizer *tap = [[uitapgesturerecognizer alloc] initwithtarget:self action:@selector(handletapfrom:)];         tap.delegate = self;          xorigin = * imagesize;         imageview1 = [[uiimageview alloc] initwithframe:cgrectmake(xorigin,50,100,50)];         imageview1.tag = i;         [imageview1 setuserinteractionenabled:yes];         [imageview1 addgesturerecognizer:tap];         [imageview1 setimage:[uiimage imagenamed:item]];         [self.scrollview addsubview:imageview1];         += 1;     }      // set contentsize equal size of uiimageview     // scrollview.contentsize = imageview.scrollview.size;     self.scrollview.contentsize = cgsizemake(numberofviews * imagesize, 70);     return self.scrollview; } 

and being set using uipickerview selection inside of viewcontroller:

-(void)pickerview:(uipickerview *)pickerview didselectrow:(nsinteger)row       incomponent:(nsinteger)component {     nslog(@"changing scroll view");     self.scrollview = [self.packages[(int)row] makescrollview]; } 

i know picker view being called because getting proper logging message. however, scrollview inside of viewcontroller not being set.

the above view, can access self.scrollview view need change.

i don't no u doing picker view, u said using scroll view shared view u can below

i assume class named myclass shared class, class provides scrollview created once,

in myclass.h file

  #import <foundation/foundation.h>    @interface myclass : nsobject //it subclass of nsobject   @property (nonatomic, retain) uiscrollview *mysharedscrollview; //say u hav shared scroll view   @property (nonatomic, retain) nsarray *picturearray;    + (id)sharedmanager;   //you dont need make scroll view becz alreday create u can access shared class object  @end 

in myclass.m file

  #import "myclass.h"    static myclass *sharedmymanager = nil;   static dispatch_once_t oncetoken;   @implementation myclass   @synthesize mysharedscrollview = _mysharedscrollview;   @synthesize picturearray = _picturearray;     + (id)sharedmanager   {        dispatch_once(&oncetoken, ^{        sharedmymanager = [[self alloc] init];        });    return sharedmymanager;  }   - (id)init   {      if (self = [super init]) {     _picturearray = [[nsarray alloc]initwithobjects:@"22.jpg",@"32.jpg",@"33.jpg", nil];     _mysharedscrollview = [[uiscrollview alloc]init];     [self initilisethescrollview];       }   return self; }   - (void)initilisethescrollview {     int imagesize =  100;//    _mysharedscrollview.contentsize = cgsizemake(500, 600);    _mysharedscrollview.scrollenabled = true;    _mysharedscrollview.bounces = true;     _mysharedscrollview.userinteractionenabled = yes;     cgfloat xorigin = 0;     int numberofviews = [_picturearray count];    //    uiimageview *imageview1;   int = 0;    for(nsstring *item in _picturearray){      uiimageview *imageview1;     uitapgesturerecognizer *tap = [[uitapgesturerecognizer alloc] initwithtarget:self action:@selector(handletapfrom:)];  //   tap.delegate = self;      xorigin = * imagesize;     imageview1 = [[uiimageview alloc] initwithframe:cgrectmake(xorigin,50,100,50)];     imageview1.tag = i;     [imageview1 setuserinteractionenabled:yes];     [imageview1 addgesturerecognizer:tap];     [imageview1 setimage:[uiimage imagenamed:item]];     [_mysharedscrollview addsubview:imageview1];     += 1;   }    // set contentsize equal size of uiimageview   // scrollview.contentsize = imageview.scrollview.size;   _mysharedscrollview.contentsize = cgsizemake(numberofviews * imagesize , 70);   }    - (void)handletapfrom:(id)sender   {      nslog(@"tapped");   }   @end 

in controller u can access shared scrollview below import class header #import "myclass.h"

- (void)viewdidload  {     [super viewdidload]; // additional setup after loading view, typically nib.     myclass *sharedobj = [myclass sharedmanager];//get shared class object     uiscrollview *scrollview = sharedobj.mysharedscrollview;     scrollview.frame = cgrectmake(0 ,20,320 , 300);//set frame scroll view hear     scrollview.backgroundcolor = [uicolor greencolor];    [self.view addsubview:scrollview];   }