greetings all,
My team and I are having a problem adding a login screen to an app that we know works.
Right now the system will through the error of unidentified selector to instance error.
If we take out the login view controller and all subsequent information the system will get the information from our JSON server and present it properly but we just can't add the login XIB and associated ViewControllers to the app. We have been banging our heads against this wall for over a week now and anythign we try either will not present the UITABLEView Controller to the screen or gives us this werror.
We are somewhat new to XCODE and IPHONE programming but not newbies to programming logic, just xcode and iphone logic.
We have several different versions of this app that are working on and we want get the pieces to work together.
here is the code
thanks for the help in advance.
John
appdelegate.h
appdelegate.m
LoginViewController.h
LoginViewController.m
ViewController.h
ViewController.m
DetailViewController.h
DetailViewController.m
My team and I are having a problem adding a login screen to an app that we know works.
Right now the system will through the error of unidentified selector to instance error.
If we take out the login view controller and all subsequent information the system will get the information from our JSON server and present it properly but we just can't add the login XIB and associated ViewControllers to the app. We have been banging our heads against this wall for over a week now and anythign we try either will not present the UITABLEView Controller to the screen or gives us this werror.
We are somewhat new to XCODE and IPHONE programming but not newbies to programming logic, just xcode and iphone logic.
We have several different versions of this app that are working on and we want get the pieces to work together.
here is the code
thanks for the help in advance.
John
appdelegate.h
Code:
//
// AppDelegate.h
#import <UIKit/UIKit.h>
@class ViewController;
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) ViewController *viewController;
@end
Code:
//
// AppDelegate.m
#import "AppDelegate.h"
#import "LoginViewController.h"
#import "ViewController.h"
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.viewController = [[ViewController alloc] initWithNibName:@"LoginViewController" bundle:nil];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:self.viewController];
self.window.rootViewController = navController;
[self.window makeKeyAndVisible];
return YES;
}
- (void)applicationWillResignActive:(UIApplication *)application
{
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}
- (void)applicationDidEnterBackground:(UIApplication *)application
{
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}
- (void)applicationWillEnterForeground:(UIApplication *)application
{
// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}
- (void)applicationDidBecomeActive:(UIApplication *)application
{
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
- (void)applicationWillTerminate:(UIApplication *)application
{
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}
@end
Code:
//
// LoginViewController.h
#import <UIKit/UIKit.h>
#import "ViewController.h"
@interface LoginViewController : UIViewController
{
ViewController *viewcontroller;
}
- (IBAction)continue:(id)sender;
@end
LoginViewController.m
Code:
//
// LoginViewController.m
#import "LoginViewController.h"
@interface LoginViewController ()
@end
@implementation LoginViewController
- (IBAction)continue:(id)sender
{
ViewController * viewcontroller = [[ViewController alloc]init];
[self.navigationController pushViewController: viewcontroller animated:YES];
[self presentModalViewController:viewcontroller animated:YES];
}
- (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 from its nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
Code:
//
// ViewController.h
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController {
IBOutlet UITableView *mainTableView;
NSArray *news;
NSMutableData *data;
}
@property (retain, nonatomic) NSString *newurl;
@end
Code:
//
// ViewController.m
#import "LoginViewController.h"
#import "ViewController.h"
#import "DetailViewController.h"
@interface ViewController ()
@end
@implementation ViewController
@synthesize newurl;
- (void)viewDidLoad
{
[super viewDidLoad];
self.title = @"papertracking";
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
NSURL *url = [NSURL URLWithString:@"http://10.4.4.11/lost/a1.php?Fone=5125551212&pincode=12&edit=Register"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
data = [[NSMutableData alloc] init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)theData
{
[data appendData:theData];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
news = [NSJSONSerialization JSONObjectWithData:data options:nil error:nil];
[mainTableView reloadData];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
UIAlertView *errorView = [[UIAlertView alloc] initWithTitle:@"Error" message:@"The download could not complete - please make sure you're connected to either 3G or Wi-Fi." delegate:nil cancelButtonTitle:@"Dismiss" otherButtonTitles:nil];
[errorView show];
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}
- (int)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (int)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [news count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"MainCell"];
if(cell == nil){
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"MainCell"];
}
cell.textLabel.text = [[news objectAtIndex:indexPath.row] objectForKey:@"dname"];
cell.detailTextLabel.text = [[news objectAtIndex:indexPath.row] objectForKey:@"dlloc"];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil];
detailViewController.title = [[news objectAtIndex:indexPath.row] objectForKey:@"dname"];
detailViewController.newsArticle = [news objectAtIndex:indexPath.row];
[self.navigationController pushViewController:detailViewController animated:YES];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
@end
DetailViewController.h
Code:
//
// DetailViewController.h
#import <UIKit/UIKit.h>
@interface DetailViewController : UIViewController {
NSDictionary *newsArticle;
IBOutlet UILabel *titleLabel;
IBOutlet UILabel *timeLabel;
IBOutlet UITextView *descTextView;
}
@property (nonatomic, copy) NSDictionary *newsArticle;
@end
Code:
//
// DetailViewController.m
#import "DetailViewController.h"
@interface DetailViewController ()
@end
@implementation DetailViewController
@synthesize newsArticle;
- (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 from its nib.
titleLabel.text = [newsArticle objectForKey:@"title"];
timeLabel.text = [newsArticle objectForKey:@"date_string"];
descTextView.text = [newsArticle objectForKey:@"article"];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
@end
Last edited: