ios - Only black screen in my UIWebView -

i have 2 view controllers. in first 1 have button , when click need display web page in second view controller. when click button, see black screen.

here tabulkaviewcontroller.m code:

#import "tabulkaviewcontroller.h" #import "webviewcontroller.h"  @interface tabulkaviewcontroller ()  @end  @implementation tabulkaviewcontroller  - (id)initwithnibname:(nsstring *)nibnameornil bundle:(nsbundle *)nibbundleornil {     self = [super initwithnibname:nibnameornil bundle:nibbundleornil];     if (self) {         // custom initialization     }     return self; }  - (void)viewdidload {     [super viewdidload];     // additional setup after loading view.      _hbutton.layer.borderwidth = 1;     _hbutton.layer.bordercolor = [[uicolor graycolor] cgcolor];         } - (ibaction)hbutton:(id)sender  {    nsurl *url = [nsurl urlwithstring:@"http://apple.com"];    webviewcontroller *webviewcontroller = [[webviewcontroller alloc] initwithurl:url andtitle:@"apple"];     [self presentviewcontroller:webviewcontroller animated:yes completion:nil]; }  - (void)didreceivememorywarning {     [super didreceivememorywarning];     // dispose of resources can recreated. } 

here code of webviewcontroller.h:

    #import <uikit/uikit.h>      @interface webviewcontroller : uiviewcontroller <uiwebviewdelegate>     {         nsurl *theurl;         nsstring *thetitle;         iboutlet uiwebview *webview;         iboutlet uinavigationitem *webtitle;      }      - (id)initwithurl:(nsurl *)url;     - (id)initwithurl:(nsurl *)url andtitle:(nsstring *)string;     - (ibaction) done:(id)sender;      @end 

and here code of webviewcontroller.m:

#import "webviewcontroller.h"  @interface webviewcontroller ()  @end  @implementation webviewcontroller  - (id)initwithnibname:(nsstring *)nibnameornil bundle:(nsbundle *)nibbundleornil {     self = [super initwithnibname:nibnameornil bundle:nibbundleornil];     if (self) {         // custom initialization     }     return self; }  - (void)viewdidload {     [super viewdidload];     webtitle.title = thetitle;     nsurlrequest *requestobject = [nsurlrequest requestwithurl:theurl];     [webview loadrequest:requestobject];}  - (void)didreceivememorywarning {     [super didreceivememorywarning];     // dispose of resources can recreated. } - (id)initwithurl:(nsurl *)url andtitle:(nsstring *)string {     if( self = [super init] ) {         theurl = url;         thetitle = string;     }     return self; }  -(id)initwithurl:(nsurl *)url {     return [self initwithurl:url andtitle:nil]; }  - (ibaction) done:(id)sender {     [self dismissviewcontrolleranimated:yes completion:nil];  }  - (void)viewwilldisappear:(bool)animated {     [super viewwilldisappear:animated];     webview.delegate = nil;     [webview stoploading]; } -(void)webviewdidstartload:(uiwebview *)webview {     [uiapplication sharedapplication].networkactivityindicatorvisible = yes; } -(void)webviewdidfinishload:(uiwebview *)webview {     [uiapplication sharedapplication].networkactivityindicatorvisible = no; } 

you need instantiate webview @ point. suggest change viewdidload this:

- (void)viewdidload {     [super viewdidload];     webview = [[uiwebview alloc] init];     webtitle.title = thetitle;     nsurlrequest *requestobject = [nsurlrequest requestwithurl:theurl];     [webview loadrequest:requestobject]; } 

since webview nullat start of method, needs created before can load requests. declaring in header file not enough, thats why need webview = [[uiwebview alloc] init];.

edit:
of course, put line ìnitwithurl:andtitle: method, other instantiations take place.