white screen on simulator iphone Xcode - ios

I watched this video on YouTube :
Xcode How to Create a Webview for iOS Applications
I followed video but if I run my app on simulator, only I see white screen.
This ViewController.h
//
// ViewController.h
//
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
{
IBOutlet UIWebView *myWebView;
}
#end
//
// ViewController.m
//
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
NSURL *myURL = [NSURL URLWithString:#"http://website.com"]; NSURLRequest *myRequest = [NSURLRequest requestWithURL:myURL]; myWebView.scalesPageToFit = YES; [myWebView loadRequest:myRequest];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
Can you get me fix this error?

tHis ViewController.m
//
// ViewController.m
//
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
NSURL *myURL = [NSURL URLWithString:#"http://website.com"]; NSURLRequest *myRequest = [NSURLRequest requestWithURL:myURL]; myWebView.scalesPageToFit = YES; [myWebView loadRequest:myRequest];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end

You have to actually load the request after you create it!
NSURL *url = [NSURL URLWithString:#"http://yoururl.com"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[self.webView loadRequest:request];

Related

Open external link from UIWebView in Safari

I want to modify my code in order to open the external links on Safari instead of the in-app browser of my app. The html files are loaded from an internal path, so I don't know how to make the app understand that all the external links have to be opened in safari.
This is my ViewController.m
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
NSString *fullURL = [[NSBundle mainBundle] pathForResource:#"index" ofType:#"html"];
NSURL *url = [NSURL fileURLWithPath:fullURL];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
[_viewWeb loadRequest:requestObj];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
How should I modify it?
Thanks!
You need to handle this in the UIWebView delegate method and check with the UIWebViewNavigationType.
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
if(navigationType == UIWebViewNavigationTypeLinkClicked){
[MAIN_APPLICATION_DELEGATE openURL:request.URL];
}
}

Passing URLs with button touch in Objective C

I'm building a basic app for my school and can't figure out how to change the URL to be presented based on the button pressed. I have four buttons and currently have them all linked to temporary URLs, but when I run my app, the webview appears blank and my NSLog returns null for the URL. What am I doing wrong? Here is my code:
TWViewController.h:
#import <UIKit/UIKit.h>
#interface TWViewController : UIViewController
- (IBAction)gradesPressed:(id)sender;
- (IBAction)facPressed:(id)sender;
- (IBAction)newsPressed:(id)sender;
- (IBAction)sportsPressed:(id)sender;
#property (strong, nonatomic) NSURL *url;
#end
TWViewController.m:
#import "TWViewController.h"
#import "TWWebViewController.h"
#interface TWViewController ()
#end
#implementation TWViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (IBAction)gradesPressed:(id)sender{
TWWebViewController *webView = [[TWWebViewController alloc] init];
webView.website = [NSURL URLWithString:#"http://google.com"];
}
- (IBAction)facPressed:(id)sender {
TWWebViewController *webView = [[TWWebViewController alloc] init];
webView.website = [NSURL URLWithString:#"http://yahoo.com"];
}
- (IBAction)newsPressed:(id)sender {
TWWebViewController *webView = [[TWWebViewController alloc] init];
webView.website = [NSURL URLWithString:#"http://facebook.com"];
}
- (IBAction)sportsPressed:(id)sender {
TWWebViewController *webView = [[TWWebViewController alloc] init];
webView.website = [NSURL URLWithString:#"http://apple.com"];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
//
// TWWebViewController *wbc = (TWWebViewController *)segue.destinationViewController;
//}
#end
TWWebViewController.h:
#import <UIKit/UIKit.h>
#interface TWWebViewController : UIViewController
{
UIWebView *webView;
NSString *website;
}
#property (strong, nonatomic) IBOutlet UIWebView *webView;
#property (strong, nonatomic) NSURL *website;
#end
TWWebViewController.m:
#import "TWWebViewController.h"
#import "TWWebViewController.h"
#interface TWWebViewController ()
#end
#implementation TWWebViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:self.website];
[self.webView loadRequest:urlRequest];
NSLog(#"%#", website);
// Do any additional setup after loading the view.
}
I'm fairly new to iOS Development, so I'm not quite sure if I'm even on the right track. Any help would be appreciated, thanks!
You need to push your controller after initializing it: Also, your NSString is not an NSURL object so do this also in your TWWebViewController: NSURLRequest *urlRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:self.website]];
TWWebViewController.m:
- (void)viewDidLoad
{
[super viewDidLoad];
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:
[NSURL URLWithString:self.website]];
[self.webView loadRequest:urlRequest];
}
TWViewController.m:
- (IBAction)sportsPressed:(id)sender
{
TWWebViewController *webView = [self.storyboard
instantiateViewControllerWithIdentifier:#"WebView"];
webView.website = #"http://apple.com";
[self.navigationController pushViewController:webView animated:YES];
}
Also don't forget to do this in your storyboard file:

Issues initializing UIWebView inside ViewController

I want to initialize a UIWebview object inside of my WebViewController. I'm having a bit of trouble initializing it, and directing it to the URL that is sent to it from the previous ViewController.
In the viewDidLoad of my WebViewController, I attempt to initialize it with the following:
UIWebView *tempWebview = [[UIWebView alloc]initWithFrame:theFrame];
NSURL *url = [NSURL URLWithString:_itemURL];
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url];
self.myWebView = tempWebview;
[tempWebview loadRequest:urlRequest];
_myWebView.delegate=self;
[WebViewController loadRequest:urlRequest];
However, this gives me errors stating:
use of undeclared identifier'theFrame', and no known class method for selector loadRequest.
Full code is below:
WebViewController.h:
#import <UIKit/UIKit.h>
#import "MatchCenterViewController.h"
#interface WebViewController : UIViewController
#property (strong, nonatomic) NSURL *itemURL;
#property (weak, nonatomic) IBOutlet UIWebView *myWebView;
#end
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];
UIWebView *tempWebview = [[UIWebView alloc]initWithFrame:theFrame];
NSURL *url = [NSURL URLWithString:_itemURL];
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url];
self.myWebView = tempWebview;
[tempWebview loadRequest:urlRequest];
_myWebView.delegate=self;
[WebViewController loadRequest:urlRequest];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
#end
First you need to define that you are going to use the UIWebView Delegate in your .h file as:
#interface WebViewController : UIViewController <UIWebViewDelegate>
When you already have a webView defined in your Xib file, why are you creating another UIWebView and assigning it to the IBOutlet's webView? You could simply do:
self.myWebView.delegate = self; //Note that I have set the delegate first before calling LoadRequest
NSURL *url = [NSURL URLWithString:#"http://www.google.com"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[self.myWebView setScalesPageToFit:YES];
[self.myWebView loadRequest:request];

Undeclared Identifier 'webview'

I am building a tab bar application with a different pdf in each tab. I have two sets of view controllers. Each have this relative code
#import "SecondViewController.h"
#interface SecondViewController ()
#end
#implementation SecondViewController
- (void)viewDidLoad
{
[super viewDidLoad];
NSString *path = [[NSBundle mainBundle] pathForResource:#"Winter_Newsletter"
ofType:#"pdf"];
NSURL *url = [NSURL fileURLWithPath:path];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[webView loadRequest:request];
[webview setScalesPageToFit:YES];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
I keep receiving an error "undeclared identifier 'web view'" What am I doing Wrong?
You are showing in the code two versions of webView(capital V) and webview(small v)
[webView loadRequest:request];
[webview setScalesPageToFit:YES];
And if you are using auto-synthesize then it sould be
self.webView or _webView
And also, don't forget to make a property of the web view and control drag to hook it up!

ios : UIWebview and its delegate methods in same class not working

I want to open links of uiwebview in to the safari browser my code is working perfectly if I implement shouldStartLoadWithRequest method in viewController but when I implement shouldStartLoadWithRequest in same class and set UIWebView's delegate to self it doesn't work it get halt in between and shows assembly level code with error EXC_BAD_ACCESS(code=2, address=0x9) my files are as follows
//content of ShowView.h file
#import <UIKit/UIKit.h>
#interface ShowView : UIView <UIWebViewDelegate> {
}
- (void) showViewFunction;
#property (nonatomic, assign) UIViewController *mainViewContObj;
#end
//content of ShowView.m file is :
#import "ShowView.h"
#implementation ShowView
- (void) showViewFunction {
UIWebView *aWebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 150)];
aWebView.autoresizesSubviews = YES;
aWebView.autoresizingMask = (UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth);
[aWebView setDelegate:self];
NSString *urlAddress = #"http://localhost/test/index.php";
NSURL *url = [NSURL URLWithString:urlAddress];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
aWebView.delegate = self;
[aWebView loadRequest:requestObj];
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
[[[self mainViewContObj] view] addSubview:aWebView];
}
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request
navigationType:(UIWebViewNavigationType)navigationType {
NSLog(#"In shouldStartLoadWithRequest method");
if ([[[request URL] absoluteString] isEqual:#"http://localhost/test/index.php"])
return YES;
[[UIApplication sharedApplication] openURL:[request URL]];
return NO;
}
#end
// Content of ViewController.h
#import "ViewController.h"
#import "ShowView.h"
#interface mnetViewController ()
#end
#implementation mnetViewController
- (void)viewDidLoad {
[super viewDidLoad];
MNETMobAd *bannerObj = [[MNETMobAd alloc] init];
bannerObj.mainViewContObj = self;
[bannerObj showAd];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
Some times html page shows but when I click on link it opens in same UIWebview window, and not even going into the shouldStartLoadWithRequest method, am I doing anything wrong?
Your code isn't clear, might need more info's, but from what i see, the ShowView class is never instanciated, so it shouldn't even show.
you should make something like this i guess :
//mnetViewController.m
#import "mnetViewController.h"
#import "ShowView.h"
#interface mnetViewController ()
#end
#implementation mnetViewController
- (void)viewDidLoad {
[super viewDidLoad];
ShowView* theShowView = [[ShowView alloc] initWithFrame:CGRectMake(insert the frame you want your webview to have)];
theShowView.autoresizesSubviews = YES;
[self.view addSubview:theShowView];
[theShowView release];
MNETMobAd *bannerObj = [[MNETMobAd alloc] init];
bannerObj.mainViewContObj = self;
[bannerObj showAd];
}
now for the ShowView class, try something like this :
//ShowView.h
#import <UIKit/UIKit.h>
#interface ShowView : UIView <UIWebViewDelegate> {
}
#end
//ShowView.m
#import "ShowView.h"
#implementation ShowView
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
UIWebView *aWebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)];
aWebView.scalesPageToFit = YES;
[aWebView setDelegate:self];
[self addSubview:aWebView];
NSString *urlAddress = #"http://localhost/test/index.php";
NSURL *url = [NSURL URLWithString:urlAddress];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
[aWebView loadRequest:requestObj];
[aWebView release];
}
return self;
}
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request
navigationType:(UIWebViewNavigationType)navigationType {
NSLog(#"In shouldStartLoadWithRequest method for URL : %#",[request [URL absolutString]]);
if ([[[request URL] absoluteString] isEqual:#"http://localhost/test/index.php"])
return YES;
[[UIApplication sharedApplication] openURL:[request URL]];
return NO;
}
This should work, i didn't try it, i'll comeback tomorrow to try it if necessary.

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