Question

I’m making my slot machine app using iCarousel, my iCarousel contains images from NSDocumentDirectory this images was from my ImagePicker. So here’s how my app works, when the user press a button the iCarousel spins.
When it stops, display the item for 3 seconds, then deletes it.

My problem is when I go to another View, the deleted index/item is there again. How to maintain my array even I go to different views. That the deleted index/item will not be shown, only until the app was restarted, like saving an array. Thanks for the help.

// my array

- (void)viewDidLoad
{
    self.images = [NSMutableArray new];  
    for(int i = 0; i <= 100; i++) 
    { 
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDir = [paths objectAtIndex:0];

        NSString *savedImagePath = [documentsDir stringByAppendingPathComponent:[NSString stringWithFormat:@"images%d.png", i]]; 
            if([[NSFileManager defaultManager] fileExistsAtPath:savedImagePath]){ 
                [images addObject:[UIImage imageWithContentsOfFile:savedImagePath]]; 
            } 
    } 
}



- (void)viewWillAppear:(BOOL)animated {    
    spinButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [spinButton addTarget:self action:@selector(spin) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:spinButton];
}
- (void) carouselDidEndScrollingAnimation:(iCarousel *)carousel{
    [NSTimer scheduledTimerWithTimeInterval:0.56 //this arranges the duration of the scroll
                                     target:self
                                   selector:@selector(deleteItem)
                                   userInfo:nil
                                    repeats:NO];   
}

// spin and delete method

- (void)spin {
        [carousel scrollByNumberOfItems:-35 duration:10.7550f];
}

-(void) deleteItem {
    //Removes the object chosen 
        NSInteger index = carousel.currentItemIndex;
        [carousel removeItemAtIndex:index animated:YES];
        [images removeObjectAtIndex:index];
}

What I need is, when the index/item is deleted, it will not be shown temporarily even if I go to other views. The views will only be restarted after app is closed and open again

Answer 1

Your problem is your are creating the images NSMutableArray every time you enter the view.

As @Saleh said you should place the array outside your view controller. To do it in the appDelegate, like he was suggesting, do the following:

In AppDelegate.h declare:

@property( strong, nonatomic) NSMutableArray *images;

In AppDelegate.m:

@synthesize images;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Read the images after the existing code ....

    self.images = [NSMutableArray array];
    for(int i = 0; i <= 100; i++) 
    { 
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDir = [paths objectAtIndex:0];

        NSString *savedImagePath = [documentsDir stringByAppendingPathComponent:[NSString stringWithFormat:@"images%d.png", i]]; 
        if([[NSFileManager defaultManager] fileExistsAtPath:savedImagePath]){ 
            [images addObject:[UIImage imageWithContentsOfFile:savedImagePath]]; 
        } 
    }     

    return YES;
}

Then in your ViewController.m:

#import "AppDelegate.h"

and change your viewDidLoad method:

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.images = ((AppDelegate *)[[UIApplication sharedApplication] delegate]).images;
}

This should work.