Xcode 4 and chapter 4 iPad code

perlguy · February 24th, 2011, 11:57 AM

I am trying to get the chapter 4 code working while using Xcode 4.

I am running into a problem basically at page 103. I have the code entered but surveys are not getting added to the list when I hit the "add" button.

I am still trying to work through the issue, but was wondering if anyone else has run into this and possibly solved it.

Thanks!

perlguy · February 24th, 2011, 12:57 PM

I figured it out. I had skipped one line of code in the text, so nothing was getting updated.

GMarie0131 · August 15th, 2011, 12:48 PM

I'm working on the code from Chapter 4, the Survey. I have compiled the code and installed it on my iPad. When I enter survey data, and sync my iPad in iTunes, it does not show up as an XML file. Does anyone have a solution to this problem? Perlguy, did you have any luck with this?

thepianoguy · August 16th, 2011, 09:09 AM

You need to change one of the method signatures in order for the data to persist. Since the introduction of iOS 4, and multitasking, the method

-(void)applicationWillTerminate:(UIApplication *)application

is rarely called since the application does not actually quit, but enters the background. In the AppDelegate method change this method signature to

-(void)applicationWillResignActive:(UIApplication *)application

The full listing would be

Code:

-(void)applicationWillResignActive:(UIApplication *)application
{
    NSLog(@"Resigning active");

//- (void)applicationWillTerminate:(UIApplication *)application { ////This method is not being called and can be deleted
    // Serialize the rootViewController's surveyDataArray
    NSData *serializedData;
    NSString *error;
    
    serializedData = [NSPropertyListSerialization 
                      dataFromPropertyList:rootViewController.surveyDataArray
                      format:NSPropertyListXMLFormat_v1_0
                      errorDescription:&error];
    
    if (serializedData)
    {
        // Serialization was successful, write the data to the file system
        // Get an array of paths. 
        // (This function is carried over from the desktop)
        NSArray *documentDirectoryPath = 
            NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, 
                                                NSUserDomainMask, YES);
        NSString *docDir = [NSString stringWithFormat:@"%@/serialized.xml",
                            [documentDirectoryPath objectAtIndex:0]];
        
        [serializedData writeToFile:docDir atomically:YES];
    }
    else
    {
        // An error has occurred, log it
        NSLog(@"Error: %@",error);
    }
}

Assuming everything else is correct, the data should now be stored, and can be synced in iTunes
Bob