ios - How to reuse this ViewController code in an object oriented way? -

i have app 4 viewcontrollers, , there lot of code repeating same way in 4 view controllers, , know best oop way write code 1 time , reuse in others view controllers.

this code viewdidload of first view controller:

- (void)viewdidload {  [super viewdidload]; [self setcandisplaybannerads:yes];  [[[self.tabbarcontroller.viewcontrollers objectatindex:1] tabbaritem]setimage:[uiimage imagenamed:@"iconobota30x30.png"]]; [[[self.tabbarcontroller.viewcontrollers objectatindex:2] tabbaritem]setimage:[uiimage imagenamed:@"actividades.png"]]; [[[self.tabbarcontroller.viewcontrollers objectatindex:3] tabbaritem]setimage:[uiimage imagenamed:@"nosotros.png"]];   float width = [uiscreen mainscreen].bounds.size.width;  float height = [uiscreen mainscreen].bounds.size.height;  static_ivar = [[uiwebview alloc] initwithframe:cgrectmake(0, 0, width,height)]; static_ivar.delegate = self; nsurl *url = [nsurl urlwithstring:@"http://guiasdelsur.es"]; nsurlrequest *requestobj = [nsurlrequest requestwithurl:url]; [static_ivar loadrequest:requestobj]; [self.view addsubview:static_ivar];   //gestures  //down uiswipegesturerecognizer *gest1 = [[uiswipegesturerecognizer alloc] initwithtarget:self action:@selector(hidetabbar:)]; gest1.delegate = self; [gest1 setdirection:uiswipegesturerecognizerdirectiondown]; [self.view addgesturerecognizer:gest1];  //up uiswipegesturerecognizer *gest2 = [[uiswipegesturerecognizer alloc] initwithtarget:self action:@selector(showtabbar:)]; gest2.delegate = self; [gest2 setdirection:uiswipegesturerecognizerdirectionup]; [self.view addgesturerecognizer:gest2];   //first tab  _tabinicio = [[uitabbaritem alloc] initwithtitle:@"inicio" image:[uiimage imagenamed:@"d.png"] tag:0];  [[uitabbar appearance] setselectedimagetintcolor:[uicolor greencolor]]; [self.tabbarcontroller setselectedindex:0];  self.tabbaritem = _tabinicio;     _ctoolbar = [[uitoolbar alloc] init]; _ctoolbar.frame = cgrectmake(0, 0, self.view.frame.size.width, 44); nsmutablearray *items = [[nsmutablearray alloc] init];   [_ctoolbar setbarstyle:uibarstyleblack]; [_ctoolbar settranslucent:yes ]; [_ctoolbar settintcolor:[uicolor greencolor]];   // additional setup after loading view, typically nib.   nsstring *backarrowstring = @"\u000025c0\u0000fe0e atrás"; //black left-pointing triangle plus variation selector uibarbuttonitem *back = [[uibarbuttonitem alloc] initwithtitle:backarrowstring style:uibarbuttonitemstyledone target:nil action:@selector(goback)];   uibarbuttonitem *right = [[uibarbuttonitem alloc] initwithbarbuttonsystemitem:uibarbuttonsystemitemrefresh target:nil action:@selector(refreshcontrol)]; [right settintcolor:[uicolor greencolor]];  uibarbuttonitem *flexiblespace = [[uibarbuttonitem alloc] initwithbarbuttonsystemitem:uibarbuttonsystemitemflexiblespace target:nil action:nil];   [items addobject:back]; [items addobject:flexiblespace]; [items addobject:right];    [_ctoolbar setitems:items animated:no];  [self.view addsubview:_ctoolbar];   //iad  adbannerview * adview = [[adbannerview alloc] initwithframe:cgrectzero]; adview.frame = cgrectoffset(adview.frame, 0, 44); adview.delegate = self; [self.view addsubview:adview];    //loading indicator _indicator = [[uiactivityindicatorview alloc] initwithactivityindicatorstyle:uiactivityindicatorviewstylegray]; [_indicator setcenter:self.view.center]; [_indicator sethideswhenstopped:yes]; [self.view addsubview:_indicator]; [_indicator startanimating]; } 

and code viewdidload method of secondviewcontroller, similar first one. differences in view controllers same ones.

- (void)viewdidload     {     [super viewdidload];     [self setcandisplaybannerads:yes];     float width = [uiscreen mainscreen].bounds.size.width;      float height = [uiscreen mainscreen].bounds.size.height;     static_ivar2 = [[uiwebview alloc] initwithframe:cgrectmake(0, 0, width,height)];      static_ivar2.delegate = self;     nsurl *url = [nsurl urlwithstring:@"http://guiasdelsur.es/category/programas/"];     nsurlrequest *requestobj = [nsurlrequest requestwithurl:url];     [static_ivar2 loadrequest:requestobj];     [self.view addsubview:static_ivar2];        //second tab      _secondtab = [[uitabbaritem alloc] initwithtitle:@"programas" image:[uiimage imagenamed:@"iconobota30x30.png"] tag:1];      [[uitabbar appearance] setselectedimagetintcolor:[uicolor greencolor]];     [self.tabbarcontroller setselectedindex:1];     self.tabbaritem = _secondtab;         //gestures      //down     uiswipegesturerecognizer *gest1 = [[uiswipegesturerecognizer alloc] initwithtarget:self action:@selector(hidetabbar:)];     gest1.delegate = self;     [gest1 setdirection:uiswipegesturerecognizerdirectiondown];     [self.view addgesturerecognizer:gest1];      //up     uiswipegesturerecognizer *gest2 = [[uiswipegesturerecognizer alloc] initwithtarget:self action:@selector(showtabbar:)];     gest2.delegate = self;     [gest2 setdirection:uiswipegesturerecognizerdirectionup];     [self.view addgesturerecognizer:gest2];        uitoolbar *ctoolbar = [[uitoolbar alloc] init];     ctoolbar.frame = cgrectmake(0, 0, self.view.frame.size.width, 44);     nsmutablearray *items = [[nsmutablearray alloc] init];       [ctoolbar setbarstyle:uibarstyleblack];     [ctoolbar settranslucent:yes ];     [ctoolbar settintcolor:[uicolor greencolor]];      uibarbuttonitem *flexiblespace = [[uibarbuttonitem alloc]initwithbarbuttonsystemitem:uibarbuttonsystemitemflexiblespace target:nil action:nil ];      uibarbuttonitem *right = [[uibarbuttonitem alloc] initwithbarbuttonsystemitem:uibarbuttonsystemitemrefresh target:nil action:@selector(refreshcontrol)];     [right settintcolor:[uicolor greencolor]];       [items addobject:flexiblespace];     [items addobject:right];         [ctoolbar setitems:items animated:no];     [self.view addsubview:ctoolbar];      //iad      adbannerview * adview = [[adbannerview alloc] initwithframe:cgrectzero];     adview.frame = cgrectoffset(adview.frame, 0, 44);     adview.delegate = self;     [self.view addsubview:adview];       //indicator       _indicador = [[uiactivityindicatorview alloc] initwithactivityindicatorstyle:uiactivityindicatorviewstylegray];     [_indicador setcenter:self.view.center];     [_indicador sethideswhenstopped:yes];      [self.view addsubview:_indicador];     [_indicador startanimating];  } 

it idea refactor code; example of dry. best way in case use inheritance: write common code in viewcontroller class, e.g.

viewcontroller.h

@interface viewcontroller : uiviewcontroller {     // variables declared here can used in subclasses } 

viewcontroller.m

- (void)viewdidload {     [super viewdidload];     [self setcandisplaybannerads:yes];     // more common code     ... } 

and have other view controllers inherit viewcontroller (rather uiviewcontroller):

firstviewcontroller.h

@interface firstviewcontroller : viewcontroller ... 

firstviewcontroller.m

- (void)viewdidload {     [super viewdidload];      // more specific code     [[[self.tabbarcontroller.viewcontrollers objectatindex:1] tabbaritem]setimage:[uiimage imagenamed:@"iconobota30x30.png"]];     [[[self.tabbarcontroller.viewcontrollers objectatindex:2] tabbaritem]setimage:[uiimage imagenamed:@"actividades.png"]];     [[[self.tabbarcontroller.viewcontrollers objectatindex:3] tabbaritem]setimage:[uiimage imagenamed:@"nosotros.png"]];     ... }