Hi there I'm experiencing a little problem with my project.
I made a QR e reader that will scan a bar code and then will search the result on my website but after scanning 6x my app just crash, I hope someone can help me with that.
I'm new with Objective-C and iPhone SDK but I really need this project, thanks.
AppDelegate.h
#import <UIKit/UIKit.h>
#class ViewController;
#interface AppDelegate : UIResponder <UIApplicationDelegate>
#property (strong, nonatomic) UIWindow *window;
#property (strong, nonatomic) ViewController *viewController;
#end
ViewController.h
#import <UIKit/UIKit.h>
#import "ZBarSDK.h"
#interface ViewController : UIViewController<ZBarReaderDelegate> {
IBOutlet UIWebView *myWeb;
IBOutlet UITextView *resultTextView;
}
- (IBAction)startScanning:(id)sender;
#end
ViewController.m
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#pragma mark - ViewController's LifeCycle methods
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
#pragma mark - Button click method
- (IBAction)startScanning:(id)sender {
ZBarReaderViewController *codeReader = [ZBarReaderViewController new];
codeReader.readerDelegate=self;
codeReader.supportedOrientationsMask = ZBarOrientationMaskAll;
ZBarImageScanner *scanner = codeReader.scanner;
[scanner setSymbology: ZBAR_I25 config: ZBAR_CFG_ENABLE to: 0];
[self presentViewController:codeReader animated:YES completion:nil];
}
#pragma mark - ZBar's Delegate method
- (void) imagePickerController: (UIImagePickerController*) reader didFinishPickingMediaWithInfo: (NSDictionary*) info
{
// get the decode results
id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults];
ZBarSymbol *symbol = nil;
for(symbol in results)
// just grab the first barcode
break;
NSString *myString = [NSString stringWithFormat:#"http://www.northland-cc.com/%#", symbol.data];
NSURL *url = [NSURL URLWithString:myString];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
[myWeb loadRequest:requestObj];
// dismiss the controller
[reader dismissViewControllerAnimated:YES completion:nil];
}
#end
Related
I know this is a common question but none of the answers fix my problem. I have a UIWebView in my app. I have everything set up correctly; the delegate is set, the webView is a property of my view controller. It is set up to load an html string upon loading the viewController. When the html string loads, in the webViewDidFinishLoad method it checks if this is the first time it loaded, and if it is it is told to load a request with a url. The string i use for the url is a property of my viewController. That string is exactly what it is supposed to be. There is just something preventing the webView from actually loading the request. Any ideas would be very much appreciated. Thank you
#interface WebViewController : UIViewController <UIWebViewDelegate, UIActionSheetDelegate, UIPrintInteractionControllerDelegate, MFMailComposeViewControllerDelegate, NSURLConnectionDelegate>
#property (nonatomic, assign) BOOL firstLoad;
#property (nonatomic, retain) UIWebView *webView;
#property (nonatomic, retain) NSString *prefixURLString;
#property (nonatomic, retain) NSString *suffixURLString;
#property (nonatomic, retain) UIActionSheet *actionSheet;
- (id)initWithTitle:(NSString *)newTitle andSuffixURL:(NSString *)suffix;
- (void)reload;
- (void)addActionButton;
- (void)showActions:(UIBarButtonItem *)sender;
- (void)dismissActionSheet;
#end
#implementation WebViewController
#synthesize webView;
#synthesize prefixURLString;
#synthesize suffixURLString;
#synthesize firstLoad;
#synthesize actionSheet;
- (id)initWithTitle:(NSString *)newTitle withPrefixURL:(NSString *)prefix andSuffixURL:(NSString *)suffix
{
self = [super initWithNibName:nil bundle:nil];
if (self) {
// Custom initialization
[self setPrefixURLString:prefix];
[self setFirstLoad:YES];
[self setTitle:newTitle];
[self setSuffixURLString:suffix];
[self setActionSheet:nil];
}
return self;
}
- (id)initWithTitle:(NSString *)newTitle andSuffixURL:(NSString *)suffix
{
return [self initWithTitle:newTitle withPrefixURL:#"https://customer.stld.com/flatroll/ios/%#" andSuffixURL:suffix];
}
- (void)reload
{
if(self.prefixURLString && self.suffixURLString)
{
NSString *fullURLString = [NSString stringWithFormat:self.prefixURLString, [self.suffixURLString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
[self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:fullURLString]]];
}
}
- (void)dealloc
{
[suffixURLString release]; suffixURLString = nil;
[prefixURLString release]; prefixURLString = nil;
[actionSheet release]; actionSheet = nil;
[super dealloc];
}
- (void):(UIWebView *)aWebView didFailLoadWithError:(NSError *)error
{
//NSLog(#"WebViewController:DidFailLoadWithError: %#", [error localizedFailureReason]);
[self setTitle:#"Loading Error"];
[self.webView loadHTMLString:[NSString stringWithFormat:#"<html><head><meta name=\"viewport\" content=\"width=device-width, user-scalable=yes\" /></head><body>Loading error:<br />%#</body></html>", [error localizedFailureReason]] baseURL:nil];
}
- (void)webViewDidFinishLoad:(UIWebView *)aWebView
{
if(self.firstLoad)
{
[self setFirstLoad:NO];
[self reload];
[self addActionButton];
}
}
#pragma mark - View lifecycle
- (void)loadView
{
UIWebView *newWebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
[newWebView setDelegate:self];
[newWebView setScalesPageToFit:YES];
[newWebView setUserInteractionEnabled:YES];
[self setWebView:newWebView];
[self setView:newWebView];
[newWebView release];
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self.webView loadHTMLString:#"<html><head><meta name=\"viewport\" content=\"width=device-width, user-scalable=yes\" /></head><body><br />Gathering data and generating report.<br />Depends on data and parameters you have requested, this could take time. Please wait...</body></html>" baseURL:nil];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
[self.webView setDelegate:nil];
[self setWebView:nil];
[self setView:nil];
}
I had the same problem, I'm not entirely sure why, but I guess it has to do something with viewControllers life cycle. Anyway try load URL in viewDidAppear method. It fixed it for me. Hope it will help
It turns out my problem had nothing to do with the UIWebView. I just had to change the credential persistence in the URLConnectionDelegate I had set up for my app. I had it set as NSURLCredentialPersistanceNone but I changed it to NSURLCredentialPersistenceSession. I hope this can help anyone else out there who had the exact problem as I did
Hi I have two viewControllers.
NewsViewController
#import "SingleViewController.h"
#interface NewsViewController : UIViewController {
}
- (NSString *)getFirstImage:(NSString *)htmlString;
#end
and the implementation file:
#import "SingleViewController.h"
SingleViewController *singleViewController;
#interface NewsPadViewController () <UIActionSheetDelegate>
- (void)loadSubscriptions;
#property (nonatomic, assign) BOOL wrap;
#property (nonatomic, retain) NSMutableArray *items;
#end
#implementation NewsPadViewController
....CODE....
- (void)carouselCurrentItemTapped{
//[self addSubview:articolo];
MWFeedItem *item =[reader.feedItems objectAtIndex:[carousel currentItemIndex]];
NSLog(#"Current Item tappped, index: %d", [carousel currentItemIndex]);
singleViewController.prova.text=#"CIAO";
singleViewController.ciao=#"sample";
[singleViewController.web loadHTMLString:item.summary baseURL:nil];
NSLog(#"conternutio:");
NSLog(singleViewController.ciao);
}
SingleViewController.h
#import <UIKit/UIKit.h>
#interface SingleViewController : UIViewController{
#public
UIWebView *web;
UILabel *prova;
NSString *ciao;
}
#property (nonatomic,retain) IBOutlet UIWebView *web;
#property (nonatomic,retain) IBOutlet UILabel *prova;
#property (nonatomic,retain) IBOutlet NSString *ciao;
#end
and SingleViewController.m
#import "SingleViewController.h"
#implementation SingleViewController
#synthesize web,prova,ciao;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[prova setText:ciao];
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#end
Why I can't access from NewsPadViewController at object in SingleViewController? Where is my error? thanks
UPADATE
- (void)carouselCurrentItemTapped{
//[self addSubview:articolo];
MWFeedItem *item =[reader.feedItems objectAtIndex:[carousel currentItemIndex]];
NSLog(#"Current Item tappped, index: %d", [carousel currentItemIndex]);
SingleViewController *singleViewController = [[SingleViewController alloc] initWithNibName:#"SingleViewController" bundle:[NSBundle mainBundle]];
singleViewController.prova.text=#"CIAO";
singleViewController.ciao=#"sample";
[singleViewController.web loadHTMLString:item.summary baseURL:nil];
NSLog(#"conternutio:");
NSLog(singleViewController.ciao);
[singleViewController setOpz:#"sample"];
}
I don't see any instantiation of SingleViewController. You have a pointer to it, but I don't see anywhere in your code example where you actually create it.
Somewhere you need something like:
if (!singleViewController) {
singleViewController = [[SingleViewController alloc] init];
}
or
SingleViewController *singleViewController = [[SingleViewController alloc] initWithNibName:#"SingleView" bundle:nil];
or from somewhere else you need to send a message or set an instance variable in NewsViewController that points to an existing instance of SingleViewController.
I am working on an app that receives a feed that I display in a UIWebView. The feed has embedded links that I want to open in Safari instead of thew WebView. I have looked over several other questions that are posted here. I am not sure what I am missing, but I think it is something simple. Here are my .h and .m files
#import
#class BlogRss;
#interface EnduranceDailyWorkoutViewController : UIViewController {
IBOutlet UIWebView * descriptionTextView;
BlogRss * currentlySelectedBlogItem;
}
#property (nonatomic, retain) UIWebView * descriptionTextView;
#property (readwrite, retain) BlogRss * currentlySelectedBlogItem;
#end
#import "EnduranceDailyWorkoutViewController.h"
#import "BlogRss.h"
#implementation EnduranceDailyWorkoutViewController
#synthesize descriptionTextView = descriptionTextView;
#synthesize currentlySelectedBlogItem = currentlySelectedBlogItem;
- (void)viewDidLoad {
[super viewDidLoad];
NSString *html = [NSString stringWithFormat:#"%# %#",currentlySelectedBlogItem.title, currentlySelectedBlogItem.contentEncoded];
[descriptionTextView loadHTMLString:html baseURL:[NSURL URLWithString:nil]];
}
-(BOOL)webView:(UIWebView *)descriptionTextView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
if (UIWebViewNavigationTypeLinkClicked == navigationType) {
[[UIApplication sharedApplication] openURL:[request URL]];
return NO;
}
return YES;
}
Using Interface Builder I have linked the IBOutlet and the UIWebView. Please let me know what I am missing. I have put break points in the webView section but the code never hits there so it is almost like something is not linked correctly in IB.
You need to ensure that the UIWebView's delegate is set to your controller. You can do this in interface builder, or you can modify your viewDidLoad method:
- (void)viewDidLoad {
[super viewDidLoad];
// add this line to set the delegate of the UIWebView
descriptionTextView.delegate = self;
NSString *html = [NSString stringWithFormat:#"%# %#",currentlySelectedBlogItem.title, currentlySelectedBlogItem.contentEncoded];
[descriptionTextView loadHTMLString:html baseURL:[NSURL URLWithString:nil]];
}
I'm new to Objective C and I'm having trouble getting delegates to work in my code.
I have a class called cViewController and in this class has a UIWebView to fetch webpages and a button above it that calls a popover class called prodMenu. What I'm having trouble with is that the function to call webpages from the prodMenu class and display it on the parent UIWebView isn't working.
cViewController.h
#import <UIKit/UIKit.h>
#import "prodMenu.h"
#interface cViewController : UIViewController <prodMenuDelegate>{
UIPopoverController *cpopover;
IBOutlet UIWebView *webImageDisplay;
}
#property (nonatomic, retain) UIWebView *webImageDisplay;
#property (nonatomic, retain) UIPopoverController *cpopover;
- (IBAction)cPopoverTapped:(id)sender;
- (void) fetchWebsite:(NSString *)website; //This is the delegate method I'm trying to call in the popover class.
#end
cViewController.m
- (IBAction)cPopoverTapped:(id)sender {
prodMenu *tp = [[prodMenu alloc] init];
cpopover = [[UIPopoverController alloc] initWithContentViewController:tp];
[tp release];
CGRect rect = CGRectMake(40, 0, 50, 50);
cpopover.popoverContentSize = CGSizeMake(250, 225);
[cpopover presentPopoverFromRect:rect inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];
}
- (void)fetchWebsite:(NSString*)website{ //This function is called by prodMenu class
NSLog(#"address: %#", website);
NSString *urlAddress = website;
NSURL *url = [NSURL URLWithString:urlAddress];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
[webImageDisplay loadRequest:requestObj];
[webImageDisplay release];
}
- (void)viewDidLoad {
[self fetchWebsite:#"http://www.yahoo.com"];
[super viewDidLoad];
}
prodMenu.h
#import <UIKit/UIKit.h>
#protocol prodMenuDelegate;
#interface prodMenu : UIViewController{
<prodMenuDelegate> delegate;
}
- (IBAction)radBtn:(id)sender; //This is the IBAction that calls the fetchWebsite function
#property (nonatomic, assign) id <prodMenuDelegate> delegate;
#end
#protocol prodMenuDelegate
- (void)fetchWebsite:(NSString *)website;
#end
prodMenu.m
#import "prodMenu.h"
#import "cViewController.h"
#implementation prodMenu
#synthesize delegate;
- (IBAction)radBtn:(id)sender{
[delegate fetchWebsite:#"http://www.google.com"]; //Here is the call to the method
}
Am I missing something here to call the delegate method? There aren't any errors or warnings. All I want to do is when the user presses a button on the popover view, the parent class underneath changes the webpage. Thanks in advance.
Just a quick idea. Have you tried declaring the delegate protocol like this
#protocol prodMenuDelegate <NSObject>
...
#end
? I often ran into troubles when omitting the < NSObject >. Also I think there is an 'id' missing in
#interface prodMenu : UIViewController{
<prodMenuDelegate> delegate;
}
Edit: Also, in the code you posted I do not see where you actually assign the prodMenu's delegate.
I have an UIViewController named MainViewController
I have another UIViewController named LeftSharingViewController;
I would like to get and use the NSString from MainViewController in my LeftSharingViewController
I have a problem, I always get (null) instead of the NSString wanted value.
Here's my code and how does the NSString get it's value
MainViewController:
- (void)webViewDidFinishLoad:(UIWebView *)webView {
leftWebViewString = [NSString stringWithString:leftWebView.request.URL.absoluteString];
}
LeftSharingViewController.h:
#import <UIKit/UIKit.h>
#import "MainViewController.h"
#import <MessageUI/MessageUI.h>
#import <MessageUI/MFMailComposeViewController.h>
#class MainViewController;
#interface LeftSharingViewController : UIViewController <MFMailComposeViewControllerDelegate> {
MainViewController *mainViewController;
NSString *leftWebViewUrl;
}
#property (nonatomic, retain) MainViewController *mainViewController;
#property (nonatomic, retain) NSString *leftWebViewUrl;
#end
LeftSharingViewController.m:
#import "LeftSharingViewController.h"
#import "MainViewController.h"
#implementation LeftSharingViewController
#synthesize mainViewController;
#synthesize leftWebViewUrl;
- (void)viewWillAppear:(BOOL)animated {
self.leftWebViewUrl = self.mainViewController.leftWebViewString;
}
#pragma mark -
#pragma mark Compose Mail
-(void)displayComposerSheet
{
MFMailComposeViewController *mailPicker = [[MFMailComposeViewController alloc] init];
mailPicker.mailComposeDelegate = self;
[mailPicker setSubject:#"Check Out This Website!"];
[mailPicker setMessageBody:[NSString stringWithFormat:#"Take a look at this site:%#", leftWebViewUrl] isHTML:YES];
mailPicker.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentModalViewController:mailPicker animated:YES];
[mailPicker release];
}
Thanks!
On your MainViewController, you are never retaining the NSString you create. You are using stringWithString:, which returns an autoreleased object.
You should either retain it, or (easier) change your code to use your accessor, which already retains, like this:
- (void)webViewDidFinishLoad:(UIWebView *)webView {
self.leftWebViewString = [NSString stringWithString:leftWebView.request.URL.absoluteString];
}
As a side note, if you are navigating from MainViewController to LeftSharingViewController, instead of "pulling" the data in LeftSharingViewController from MainViewController, I would do it the other way around:
In MainViewController, before displaying the view of LeftSharingViewController, I'd set the required properties.