UICollection View - Segue - selected a specific cell, LOG

I'm starting to use UICOllectionview to load a custom photo album, the album loads just fine, and the data comes from my server (SQL-JSON-NSARRAY-NSDictionary) and the cell is filled in just fine, However, now I would like it when the user selects this cell to load new UIVIewController with this image in full size (so that they can view / print / share, etc.)

However, I am stuck in the prepare for segue method, since I cannot get any information out of this particular cell

as a test right now, I just want NSLOG to say: "User selected TITLE OF ALBUM% @"

Here is my code so far, any help would be greatly appreciated ...

#import "AlbumViewController.h"
#import "AlbumCustomCell.h"
#import "PhotosInAlbumsViewController.h"

@interface AlbumViewController ()

@end

@implementation AlbumViewController

- (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.
    /// Grab Photo Album information (pics,title,date) From Server



    NSString *myURL1 = [ NSString stringWithFormat:         @"http://mywebsiteaddress.com/index.php"];
    NSData *data = [NSData dataWithContentsOfURL: [NSURL URLWithString:myURL1]];
    NSError *error;
    NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
    NSArray *items = [json objectForKey:@"users"];
    photoalbumarray = items;
   // NSLog(@"%@", photoalbumarray);
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
    return 1;

}

-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
  return [photoalbumarray count];
}

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *cellID = @"CelliD";
    AlbumCustomCell *myCell = (AlbumCustomCell *) [collectionView dequeueReusableCellWithReuseIdentifier:cellID forIndexPath:indexPath];
    // this above states to setup the cell using the Identifier I specified in Sotry board, so that cell is constantly reused

    if (indexPath.section == 0) { 
         NSDictionary *item = [photoalbumarray objectAtIndex:[indexPath row]];
myCell.titleincell.text = [item objectForKey:@"title"]; // this puts the title in the cell
        teststring = [item objectForKey:@"title"];

        myCell.dateincell.text = [item objectForKey:@"date"]; // this puts the date in the     data label in the cell


      //  myCell.imageincell1.image = [UIImage imageNamed:[item objectForKey:@"img1"]]; // this puts the picture in the cell
         myCell.imageincell2.image = [UIImage imageNamed:[item objectForKey:@"img2"]]; // this puts the picture in the cell
         myCell.imageincell3.image = [UIImage imageNamed:[item objectForKey:@"img3"]]; // this puts the picture in the cell

        // IMAGE 1
        NSString *picture1 = [item objectForKey:@"img1"];
        NSURL *imageURL1 = [NSURL URLWithString:picture1];
        NSData * imageData1 = [NSData dataWithContentsOfURL:imageURL1];
        UIImage * image1 = [UIImage imageWithData:imageData1];
        myCell.imageincell1.image = image1;

    myCell.imageincell1.alpha = 0.0;
    [UIView animateWithDuration:1.5 animations:^{
        myCell.imageincell1.alpha = 1.0;
    }];


    // IMAGE 2
    NSString *picture2 = [item objectForKey:@"img2"];
    NSURL *imageURL2 = [NSURL URLWithString:picture2];
    NSData * imageData2 = [NSData dataWithContentsOfURL:imageURL2];
    UIImage * image2 = [UIImage imageWithData:imageData2];
    myCell.imageincell2.image = image2;

    myCell.imageincell2.alpha = 0.0;
    [UIView animateWithDuration:1.5 animations:^{
        myCell.imageincell2.alpha = 1.0;
    }];



    // I MAGE 3
    NSString *picture3 = [item objectForKey:@"img3"];
    NSURL *imageURL3 = [NSURL URLWithString:picture3];
    NSData * imageData3 = [NSData dataWithContentsOfURL:imageURL3];
    UIImage * image3 = [UIImage imageWithData:imageData3];
    myCell.imageincell3.image = image3;
    myCell.imageincell3.alpha = 0.0;
    [UIView animateWithDuration:1.5 animations:^{
        myCell.imageincell3.alpha = 1.0;
    }];

}
return myCell;
}



// SEGUE TRANSITION FROM ALBUMS TO PHOTO
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"showPhotoAlbum"]) {
        NSLog(@"Prepare for Segue to load Specific Photo Album");
        NSLog(@"User Selected this cell or the name of the title in the cell which comes from a NSDictionary =>");
// EXAMPLE NSLOG TO SHOW =>  User Selected - Album Name
// Where album name is actually the album name grabbed form the server based on the selected row
    }
}

@end

JSON , ,

2012-10-01 13:02:53.856 CB Photo[3957:907] (
        {
        date = "2012-10-01 07:23:01";
        id = 1;
        img1 = "http://b2fdev.ca/demo/CBPhoto/pic1.jpg";
        img2 = "http://b2fdev.ca/demo/CBPhoto/pic2.jpg";
        img3 = "http://b2fdev.ca/demo/CBPhoto/pic3.jpg";
        title = "Paul and Jenna Wedding 2012";
    },
        {
        date = "2012-10-01 05:23:23";
        id = 2;
        img1 = "http://core1.ca/wp-content/themes/custom-community/images/block4.png";
        img2 = "http://core1.ca/wp-content/themes/custom-community/images/block3.png";
        img3 = "http://core1.ca/wp-content/themes/custom-community/images/block2.png";
        title = "Core 1";
    }
)
+5
4

?

NSArray *indexPaths = [self.collectionView indexPathsForSelectedItems];
DetailViewController *destViewController = segue.destinationViewController;

NSIndexPath *index = [indexPaths objectAtIndex:0];

NSLog(@"%d", index.section * 2 + index.row);

2 x ;

+14

, , :

NSInteger selectedPhotoIndex;

, - :

- (void)collectionView:(UICollectionView *)collectionView 
            didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    selectedPhotoIndex = indexPath.row;
}

prepareForSegue. :

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([[segue identifier] isEqualToString:@"ShowPhotoAlbum"]) {
        NSLog(@"User selected %@", [[photoalbumarray objectAtIndex:selectedPhotoIndex] objectForKey:@"title");
        // ... find the right detail VC, set its data, set up delegate etc.
    }
}

, . , NSIndexPath .

+7

, :

[self.collectionView indexPathsForSelectedItems];

It returns an indexPath array. Then you can configure the destination view controller as follows:

NSArray *indexPaths = [self.collectionView indexPathsForSelectedItems];
ViewController *destinationViewController = (ViewController *)segue.destinationViewController;
destinationViewController.myPropertyToSet = [self.photoalbumarray objectAtIndex:[[test objectAtIndex:0] row]]; // You may have to store it in a proper NSindexPath object before or cast it

I only get index 0, but you can query for any index returned in the indexPaths array. Also, be sure to make sure the array is not empty (usually it should not be just in case)

+2
source

You can also use the sender parameter

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender

Because the sender will be a UICollectionViewCell or the subclass that started the session.

This will help clear your code.

So, as an example for the code indicated in the original question

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    [super prepareForSegue:segue sender:sender];

    id destination = segue.destinationViewController;

    if ([sender isKindOfClass:[AlbumCustomCell class]])
    {
        AlbumCustomCell *cell = sender;
        // set something on destination with a value from the cell
    }
}
+2
source

All Articles