Only black screen in my UIWebView - ios

Question

I have two View Controllers. In the first one i have a button and when you click it you need to display a Web Page in a second View Controller. When I click the button, I see only a black screen.
Here is 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];
// Do any additional setup after loading the 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 any resources that can be recreated.
}
Here is 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 is 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 any resources that can be 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;
}

Answer 1

You need to instantiate the webView at some point. I suggest you change your viewDidLoad to this:
- (void)viewDidLoad
{
[super viewDidLoad];
webView = [[UIWebView alloc] init];
webTitle.title = theTitle;
NSURLRequest *requestObject = [NSURLRequest requestWithURL:theURL];
[webView loadRequest:requestObject];
}
Since your webView is nullat the start of the method, it needs to be created before you can load any Requests. Just declaring it in the header file is not enough, thats why you need webView = [[UIWebView alloc] init];.
EDIT:
Of course, you could also put that line into your ìnitWithURL:andTitle: method, where the other instantiations take place.