UITableViewController在重新访问时不显示单元格

Question

I have a MAIN camera View (camera) and a TABLE view (photo list) connected by segue in interface builder. For the table View I decided to build it on my own (UIViewController with TableView inside, cells are loaded in from a XIB with its own class)

When I run the application and travel from Camera view to Table view, everything works fine, cell background colour is shown, list can be scrolled with no problems too. (Reuse cells no problems)

Then I unwind segue back to the Camera view and come back to Table view again, the number of cells is correct but all are empty cells.

I have NSLog for each cells, the frame has been changed, and autoSize disappeared. Why would that happen ? Do I need to do some clean up when I unwind the segue so the next time it will start the UIViewController from scratch like the first time ?

any hints would be appreciated. Thank you !

// FIRST TIME TO TABLE VIEW
<galleryCell: 0x17516300; baseClass = UITableViewCell; frame = (0 0; 480 77); autoresize = RM+BM; layer = <CALayer: 0x175166a0>>

// SECOND TIME TO TABLE VIEW 
<galleryCell: 0x175a4910; baseClass = UITableViewCell; frame = (0 0; 320 44); layer = <CALayer: 0x17513d10>>

[UPDATE] source code

// TableController.h
#import <UIKit/UIKit.h>
@interface TableController : UIViewController <UITableViewDelegate,UITableViewDataSource>
@property (nonatomic,weak) IBOutlet UITableView *tv;
@property (nonatomic,strong)  NSArray *data;
@end

[UPDATE full .m file]

//
//  TableController.m
//  blurCam
//
//  Created by KDS on 3/25/16.
//  Copyright (c) 2016 KDS. All rights reserved.
//

#import "TableController.h"
#import "galleryCell.h"
#import "UIButtonExt.h"

BOOL nibRegistered=NO;

@implementation TableController

+(UIBarButtonItem*) backButton: (id)target selector:(SEL)selector{

    UIViewController* controller=(UIViewController*)target;
    [controller.navigationController setNavigationBarHidden:NO];

    UIImage* backImg = [UIImage imageNamed:@"detail_back.png"];
    UIButtonExt* backBtn = [UIButtonExt buttonWithType:UIButtonTypeCustom];
    [backBtn setFrame:CGRectMake(0, 0, backImg.size.width/3.0 , backImg.size.height/3.0)];
    [backBtn setImage:backImg forState:UIControlStateNormal];
    [backBtn addTarget:target action:selector forControlEvents:UIControlEventTouchUpInside];

    return [[UIBarButtonItem alloc] initWithCustomView:backBtn];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    [[self navigationController] setNavigationBarHidden:NO animated:YES];
    self.navigationItem.leftBarButtonItem=[TableController backButton:self selector:@selector(back)];

    // get document folder file list
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    _data=[self listFileAtPath:documentsDirectory];

    [self.tv reloadData];
}

-(void) viewWillAppear:(BOOL)animated {
    [_tv reloadData];
}

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

-(NSArray *)listFileAtPath:(NSString *)path
{
    //-----> LIST ALL FILES <-----//
    NSLog(@"LISTING ALL FILES FOUND");

    int count;
    NSArray *directoryContent = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:NULL];
    return directoryContent;
}

// LAYER TABLE !
//
#pragma mark-
#pragma mark Table view data source method


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [_data count];
}

-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    // set a tag
    static NSString *iden=@"galleryCell";

    // use nib as cell design

    if(nibRegistered==NO) {
        UINib *nib=[UINib nibWithNibName:@"galleryCell" bundle:nil];
        [tableView registerNib:nib forCellReuseIdentifier:iden];
        nibRegistered=YES;
    }

    // ask for reuse ?
    galleryCell *cell=(galleryCell*)[tableView dequeueReusableCellWithIdentifier:iden];
    if(cell == nil){
        NSLog(@"NILLLLLL");
        cell = [[galleryCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:iden];
    }

    cell.btn1.hidden=NO;

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *imgPath = [documentsDirectory stringByAppendingPathComponent:[_data objectAtIndex:0]];
    NSData *imgData = [[NSData alloc] initWithContentsOfURL:[NSURL fileURLWithPath:imgPath]];

    UIImage *img=[UIImage imageWithData:imgData];
    NSLog(@"image to load %@",imgPath);

    [cell.btn1 setImage:img forState:UIControlStateNormal];

    NSLog(@"~~~%@",cell);
    NSLog(@"~~~hidden %d",cell.hidden);


    return cell;

}

-(CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
       return 77;
}

//
//
//
//

- (BOOL)prefersStatusBarHidden { return YES; }

//

-(void) back {
    [self performSegueWithIdentifier: @"cameraSegue" sender: self];
}


@end

and here's the outlet connections of TableController

and the outlet Connection of galleryCell.XIB

Answer 1

OK here's what's working this line won't load the XIB

cell = [[galleryCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:iden];

replace this line of code in the .m file

cell = [[[NSBundle mainBundle] loadNibNamed:@"galleryCell" owner:self options:nil] objectAtIndex:0]; 

then it is running with no problems.