Segue item info from CollectionView to ViewController - ios

Question

Good afternoon,
I'm trying to make a Segue when the user touches an item from my CollectionView, but it's not working. First, I get the entries of the user from a database (and they are the full URL of the images) and then I display it in the Collection View.
The problem is, when I try to send the one I have touched, it's always NULL. I have tried following tutorials and examples, but no one is loading the entries from a database (and the full url also). The images are loaded in the "fetchImages".
Can you help me? What do I have to do to send the URL of the item I have touched?
This is my ViewController (where my CollectionView is):
//
#import "ProfileViewController.h"
#import "CarDetailOtherViewController.h"
#import <Security/Security.h>
#import "SSKeychainQuery.h"
#import "SSKeychain.h"
#import "SBJson.h"
#interface NSURLRequest (DummyInterface)
+ (BOOL)allowsAnyHTTPSCertificateForHost:(NSString*)host;
+ (void)setAllowsAnyHTTPSCertificate:(BOOL)allow forHost:(NSString*)host;
#end
#interface ProfileViewController ()
#end
#implementation ProfileViewController
static NSString * const reuseIdentifier = #"Cell";
- (void)viewDidLoad {
[super viewDidLoad];
[self.view setBackgroundColor: [self colorWithHexString:#"FFFFFF"]];
self.profileimage.layer.cornerRadius = self.profileimage.frame.size.width / 2;
self.profileimage.clipsToBounds = YES;
self.profileimage.layer.borderWidth = 1.0f;
self.profileimage.layer.borderColor = [UIColor whiteColor].CGColor;
[self fetchImages];
// COLLECTION VIEW
self.oneCollectionView.dataSource = self;
self.oneCollectionView.delegate = self;
}
// MOSTRAMOS LA INFO CUANDO SE HAYA MOSTRADO EL VIEW
- (void)viewDidAppear:(BOOL)animated
{
[self fetchJson];
}
// COLLECTION VIEW
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section
{
return 1;
}
// COLLECTION VIEW
-(NSInteger)numberOfSectionsInCollectionView: (UICollectionView *)collectionView
{
return 1;
}
// COLLECTION VIEW
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return _carImages.count;
}
/*
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
static NSString *identifier = #"Cell";
RecipeViewCell *cell = (RecipeViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
recipeImageView.image = [UIImage imageNamed:[recipeImages[indexPath.section] objectAtIndex:indexPath.row]];
cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"photo-frame-2.png"]];
cell.selectedBackgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"photo-frame-selected.png"]];
return cell;
}
*/
// COLLECTION VIEW
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
MyCollectionViewCell *myCell = [collectionView
dequeueReusableCellWithReuseIdentifier:#"MyCell"
forIndexPath:indexPath];
NSString *data = [[_jsonArray objectAtIndex:indexPath.row] valueForKey:#"imagen"];
NSURL * imageURL = [NSURL URLWithString:data];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSData *imageData = [NSData dataWithContentsOfURL: imageURL];
UIImage *img = [UIImage imageWithData:imageData];
[myCell.imageview performSelectorOnMainThread:#selector(setImage:) withObject:img waitUntilDone:YES];
});
return myCell;
}
// PROFILE INFO
-(void)fetchJson {
NSString *usersPassword = [SSKeychain passwordForService:#"login" account:#"account"];
NSLog(#"usersPassword ==> %#", usersPassword);
NSString *post =[[NSString alloc] initWithFormat:#"usersPassword=%#",usersPassword];
//NSLog(#"PostData: %#",post);
NSURL *url=[NSURL URLWithString:#"http://website.com/profile.php"];
//NSData * data = [NSData dataWithContentsOfURL:url];
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:#"%lu", (unsigned long)[postData length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:url];
[request setHTTPMethod:#"POST"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/json" forHTTPHeaderField:#"Accept"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:postData];
[NSURLRequest setAllowsAnyHTTPSCertificate:YES forHost:[url host]];
NSError *error = [[NSError alloc] init];
NSHTTPURLResponse *response = nil;
NSData *urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
//NSLog(#"Response code: %ld", (long)[response statusCode]);
if ([response statusCode] >=200 && [response statusCode] <300)
{
NSString *responseData = [[NSString alloc]initWithData:urlData encoding:NSUTF8StringEncoding];
SBJsonParser *jsonParser = [SBJsonParser new];
NSDictionary *jsonData = (NSDictionary *) [jsonParser objectWithString:responseData error:nil];
NSInteger stars = [(NSNumber *) [jsonData objectForKey:#"stars"] integerValue];
self.stars.text = [NSString stringWithFormat:#"%li", (long)stars];
NSInteger followers = [(NSNumber *) [jsonData objectForKey:#"followers"] integerValue];
self.followers.text = [NSString stringWithFormat:#"%li", (long)followers];
NSInteger pictures = [(NSNumber *) [jsonData objectForKey:#"photos"] integerValue];
self.pictures.text = [NSString stringWithFormat:#"%li", (long)pictures];
self.username.text = [NSString stringWithFormat:#"*%#", usersPassword];
NSString *picture = [jsonData objectForKey:#"picture"];
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:picture]];
self.profileimage.image = [UIImage imageWithData:imageData];
}
}
-(void)fetchImages {
self.carImages = [[NSMutableArray alloc] init];
NSString *usersPassword = [SSKeychain passwordForService:#"login" account:#"account"];
NSString * urlString = [NSString stringWithFormat:#"http://website.com/posts.php?usersPassword=%#",usersPassword];
NSURL * url = [NSURL URLWithString:urlString];
NSData * data = [NSData dataWithContentsOfURL:url];
NSError *error;
[_jsonArray removeAllObjects];
_jsonArray = [NSJSONSerialization
JSONObjectWithData:data
options:NSJSONReadingMutableContainers|NSJSONReadingMutableLeaves
error:&error];
for(int i=0;i<_jsonArray.count;i++)
{
NSDictionary * jsonObject = [_jsonArray objectAtIndex:i];
NSString* imagen = [jsonObject objectForKey:#"imagen"];
[_carImages addObject:imagen];
}
NSLog(#"CARIMAGES ==> %#", _carImages);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
// IMAGEN
-(UIColor*)colorWithHexString:(NSString*)hex
{
NSString *cString = [[hex stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
// String should be 6 or 8 characters
if ([cString length] < 6) return [UIColor grayColor];
// strip 0X if it appears
if ([cString hasPrefix:#"0X"]) cString = [cString substringFromIndex:2];
if ([cString length] != 6) return [UIColor grayColor];
// Separate into r, g, b substrings
NSRange range;
range.location = 0;
range.length = 2;
NSString *rString = [cString substringWithRange:range];
range.location = 2;
NSString *gString = [cString substringWithRange:range];
range.location = 4;
NSString *bString = [cString substringWithRange:range];
// Scan values
unsigned int r, g, b;
[[NSScanner scannerWithString:rString] scanHexInt:&r];
[[NSScanner scannerWithString:gString] scanHexInt:&g];
[[NSScanner scannerWithString:bString] scanHexInt:&b];
return [UIColor colorWithRed:((float) r / 255.0f)
green:((float) g / 255.0f)
blue:((float) b / 255.0f)
alpha:1.0f];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([[segue identifier] isEqualToString:#"segueentry"])
{
NSArray *indexPaths = [self.oneCollectionView indexPathsForSelectedItems];
CarDetailOtherViewController *destViewController = segue.destinationViewController;
NSIndexPath *indexPath = [indexPaths objectAtIndex:0];
destViewController.ID = [[_jsonArray objectAtIndex:indexPath.section] valueForKey:#"imagen"];
NSLog(#"DATA ==> %#", [[_jsonArray objectAtIndex:indexPath.section] valueForKey:#"imagen"]);
}
}
#end
Thanks in advance.

Answer 1

it has to be row instead of section in your prepareforsegue:
destViewController.ID = [[_jsonArray objectAtIndex:indexPath.row] valueForKey:#"imagen"];
and btw: you can easily get the indexpath doing the following:
NSIndexPath *selectedIndexPath = [self.collectionView indexPathForCell:sender];

Answer 2

You have to add this delegate method, this delegate will call every time you select a item in the UICollectionView. Inside this delegate perform your segue. As the sender, send your selected indexPath.
- (void)collectionView:(UICollectionView *)collectionView
didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
[self performSegueWithIdentifier:#"segueentry" sender: indexPath];
}
Then from - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender you can get the selected indexPath as sender for your logic.