Okay so I have found a nice chapter in my book that I am reading (iPhone programming - the big nerd ranch guide) and chapter 12 has a great section that explains how UINavigation and UIViewController work together, Not only that but it managed to explain how the hierarchy works when dealing with viewControllers. But where I start to get a little bit lost is when I try to create my own object that handles the connection security of my app.
I will show you what I am doing, then explain to you why.. and hopefully then you can help me out with some suggestions.
AppDelegate: As soon as my app loads it calls application:didFinishLaunchingWithOptions: in which I call a method (startPingConnect) from my NSObject pingConnection that I have created and will handle most/all of my connection methods.
Code:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
//Cookie check as soon as app loads
pingConnection *Ping = [[pingConnection alloc] init];
[Ping startPingConnect];
// Add the navigation controller's view to the window and display.
[self.window addSubview:navigationController.view];
[self.window makeKeyAndVisible];
return YES;
}
So then When the application starts up and pingConnection is called it executes the code thats in my startPingConnect method below is my pingConnection object.
Code:
#import "pingConnection.h"
#import "instaCode1_3AppDelegate.h"
#import "alerts.h" //alertViews are held in this file.
@implementation pingConnection
-(void)startPingConnect{
//urlstart string
NSString *startURL = (@"IPADDRESS_HERE_func=ping");
NSURL *url = [NSURL URLWithString:startURL];
//create a request object with that url
NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:30];
//clear out the exisiting connection if there is one
if (connectionInProgress) {
[connectionInProgress cancel];
[connectionInProgress release];
}
//Instantiate the object to hold all incoming data
[cookieData release];
cookieData = [[NSMutableData alloc]init];
//create and initiate the connection - non-blocking
connectionInProgress = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[cookieData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
//we are just checking to make sure we are getting the SML
NSString *cookieCheck = [[[NSString alloc] initWithData:cookieData encoding:NSUTF8StringEncoding] autorelease];
NSLog(@"yum yum feed me more cookie!! %@",cookieCheck);
//Put cookie check stuff here..
[B]//CODE=1
if([cookieCheck rangeOfString:@"Code=1"].location != NSNotFound) {
//found it Send error prompt (OK loads new view for fucnt Reg)
NSLog(@"cookieCode = code1");
//Call pleaseRegisterDevice method from alerts object
alerts *newAlert = [[alerts alloc] init];
[newAlert pleaseRegisterDevice];
}else {
//cant find appropriate response...
NSLog(@"cookieCode = code?");
}[/B]
}
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
NSLog(@"msg from alertView method");
//open new window
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
[connectionInProgress release];
connectionInProgress = nil;
[cookieData release];
cookieData = nil;
NSString *errorString = [NSString stringWithFormat:@"Fetch failed: %@", [error localizedDescription]];
UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:errorString delegate:nil cancelButtonTitle:@"OK" destructiveButtonTitle:nil otherButtonTitles:nil];
//[actionSheet showInView:instaCode1_3AppDelegate.window];
[actionSheet autorelease];
}
@end
This code is not funny finished yes as I have to write if statements for each code response but so far it runs through and checks to see if the phone is registered with a cookie number no cookie number or out of sync will give back code 1 which is then sent off to my alert NSObject. which is below
Code:
#import "alerts.h"
//////.h file
#import <Foundation/Foundation.h>
@interface alerts : NSObject {
RegisterDeviceViewController *regViewController;
}
@property (nonatomic, retain) IBOutlet RegisterDeviceViewController *regViewController;
- (void)pleaseRegisterDevice;
@end
/////.m file
#import "instaCode1_3AppDelegate.h"
#import "RegisterDeviceViewController.h"
@implementation alerts
//use this alert when phone falls out of sync
- (void)pleaseRegisterDevice {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Please Register Device"
message:@"click OK to register"
delegate:self
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert autorelease];
[alert show];
}
//Catch pleaseRegisterDevice method
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
NSString *buttonTitle=[alertView buttonTitleAtIndex:buttonIndex];
if ([buttonTitle isEqualToString:@"OK"]) {
NSLog(@"msg from alertView method");
//open new wndow
//do I need to create and instance of RegisterDeviceViewController
if (!regViewController) {
regViewController = [[RegisterDeviceViewController alloc] init];
}
//push it onto the top pf the navigation controller's stack
[[self navigationController] pushViewController:regViewController animated:YES];
}
else {
NSLog(@"was not able to push view");
}
}
@end
now I'm having several errors in this code where I'm trying to initialize my view controllers inside alertView:didDismissWithButtonIndex: I'm just wondering if its because your not meant to do this sort of thing inside an NSObject... which I think is the problem and if so how do I go about this while keeping or at least trying to keep the portability of my code (i.e. encapsulated objects)
any help or suggestions would be greatly appreciated I try to learn and listen to everything said to me and am already hugely grateful for the help I have received so far.
EDIT:
opps, so I realized I was declaring my viewController in the wrong header. I have put that in the right header, but now I am still getting a problem where my 'alerts' object may not respond to my navigationController. any idea why?
