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POPassing a Value Through a Navigation Controller
 

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    <p>I'm looking to pass a user chosen value from one view to the next so it can be submitted to Twitter, Facebook, etc.</p> <p>Would a global variable be best to implement? I don't want the value to be stored or saved anywhere.. just to make it through the end of the navigation controller (submission to Facebook, Twitter, etc.)</p> <p>Any suggestions? Thanks in advance.</p> <p><strong>Header File</strong></p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #import &lt;Foundation/Foundation.h&gt; #import "ShareViewController.h" #include "TwitterRushViewController.h" @interface KindViewController : UIViewController &lt;UIPickerViewDelegate, UIScrollViewDelegate, CLLocationManagerDelegate&gt; { IBOutlet UIScrollView *scrollView; IBOutlet UIPageControl *pageControl; BOOL pageControlIsChangingPage; CLLocationManager *locationManager; NSString *finalCoordinates; NSString *finalChoice; } @property (nonatomic, retain) UIView *scrollView; @property (nonatomic, retain) UIPageControl *pageControl; @property (nonatomic, retain) CLLocationManager *locationManager; @property (retain) NSString *finalCoordinates; @property (nonatomic, copy) NSString *finalChoice; -(IBAction)changePage:(id)sender; -(IBAction)submitChoice:(id)sender; -(void)setupPage; @end </code></pre> <p><strong>Implementation File</strong></p> <pre><code>#import "KindViewController.h" #import "JSON/JSON.h" @implementation KindViewController @synthesize scrollView; @synthesize pageControl; @synthesize locationManager; @synthesize finalCoordinates; @synthesize finalChoice; #pragma mark - #pragma mark UIView boilerplate - (void)viewDidLoad { [self setupPage]; [super viewDidLoad]; // Alert the User on Location Access self.locationManager = [[[CLLocationManager alloc] init] autorelease]; self.locationManager.delegate = self; [locationManager setDesiredAccuracy:kCLLocationAccuracyBest]; } -(void)viewWillAppear:(BOOL)animated { [locationManager startUpdatingLocation]; } - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { CLLocation *location = newLocation; NSLog(@"Our current Latitude is %f", location.coordinate.latitude); NSLog(@"Our current Longitude is %f", location.coordinate.longitude); NSString *Coordinates = [[NSString alloc] initWithFormat: @"Longitude=%f&amp;Latitude=%f", location.coordinate.longitude, location.coordinate.latitude ]; NSLog(@"Test: %@", Coordinates); finalCoordinates = Coordinates; [locationManager stopUpdatingLocation]; } #pragma mark - #pragma mark The Guts - (void)setupPage { scrollView.delegate = self; [scrollView setCanCancelContentTouches:NO]; scrollView.indicatorStyle = UIScrollViewIndicatorStyleWhite; scrollView.clipsToBounds = YES; scrollView.scrollEnabled = YES; scrollView.pagingEnabled = YES; NSUInteger nimages = 0; CGFloat cx = 0; for (; ; nimages++) { NSString *imageName = [NSString stringWithFormat:@"choice%d.png", (nimages + 1)]; UIImage *image = [UIImage imageNamed:imageName]; if (image == nil) { break; } UIImageView *imageView = [[UIImageView alloc] initWithImage:image]; CGRect rect = imageView.frame; rect.size.height = image.size.height; rect.size.width = image.size.width; rect.origin.x = ((scrollView.frame.size.width - image.size.width) / 2) + cx; rect.origin.y = ((scrollView.frame.size.height - image.size.height) / 2); imageView.frame = rect; [scrollView addSubview:imageView]; [imageView release]; cx += scrollView.frame.size.width; } self.pageControl.numberOfPages = nimages; [scrollView setContentSize:CGSizeMake(cx, [scrollView bounds].size.height)]; } #pragma mark - #pragma mark UIScrollViewDelegate stuff - (void)scrollViewDidScroll:(UIScrollView *)_scrollView { if (pageControlIsChangingPage) { return; } CGFloat pageWidth = _scrollView.frame.size.width; int page = floor((_scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1; pageControl.currentPage = page; } - (void)scrollViewDidEndDecelerating:(UIScrollView *)_scrollView { pageControlIsChangingPage = NO; } #pragma mark - #pragma mark PageControl stuff - (IBAction)changePage:(id)sender { CGRect frame = scrollView.frame; frame.origin.x = frame.size.width * pageControl.currentPage; frame.origin.y = 0; [scrollView scrollRectToVisible:frame animated:YES]; pageControlIsChangingPage = YES; } -(IBAction)submitChoice:(id)sender; { // Spinner UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(135,140,50,50)]; [spinner startAnimating]; [self.view addSubview:spinner]; // Find the Date NSDateFormatter *format = [[NSDateFormatter alloc] init]; [format setDateFormat:@"MMM dd, yyyy HH:mm"]; NSDate *now = [[NSDate alloc] init]; NSString *dateString = [format stringFromDate:now]; // Echo Everything NSLog(@"Type is %f.", scrollView.contentOffset.x); NSLog(@"Date is %@", dateString); NSLog(@"Coordinates are %@", finalCoordinates); NSString *completeURL = [[NSString alloc] initWithFormat: @"http://www.example.com/insert.php?Type=%f&amp;Time=%@&amp;%@", scrollView.contentOffset.x, dateString, finalCoordinates]; NSString *escapedUrl = [completeURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; NSLog(@"URL is %@.", escapedUrl); // Post to Web Server NSURL *urlToSend = [[NSURL alloc] initWithString:escapedUrl]; NSLog(@"NSURL is %@.", urlToSend); NSURLRequest *urlRequest = [NSURLRequest requestWithURL:urlToSend cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:30]; NSData *urlData; NSURLResponse *response; NSError *error; urlData = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:&amp;response error:&amp;error]; // Do the Button Action ShareViewController *shareViewController = [[ShareViewController alloc] initWithNibName:@"ShareViewController" bundle:nil]; shareViewController.finalChoice = @"Facebook Property"; [self.navigationController pushViewController:shareViewController animated:YES]; [shareViewController release]; [urlToSend release]; [completeURL release]; [spinner release]; } - (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error { NSLog(@"There is an error updating the location"); } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; } - (void)viewDidUnload { [super viewDidUnload]; [pageControl release]; } - (void)dealloc { [super dealloc]; } @end </code></pre> <p><strong>ShareViewController.h</strong></p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #import "MapViewController.h" #import "SA_OAuthTwitterController.h" #import "FBConnect/FBConnect.h" #import "TwitterRushViewController.h" #import "oAuth2TestViewController.h" @class SA_OAuthTwitterEngine; @interface ShareViewController : UIViewController &lt;UITextFieldDelegate, SA_OAuthTwitterControllerDelegate&gt; { } @property (nonatomic, retain) IBOutlet UIButton *shareFacebookBTN; @property (nonatomic, retain) IBOutlet UIButton *shareTwitterBTN; @property (nonatomic, retain) KindViewController finalChoice; /* Submissions */ - (IBAction)shareNoThanks:(id)sender; - (IBAction)shareFacebook:(id)sender; - (IBAction)shareTwitter:(id)sender; @end </code></pre>
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