tableViewCrash.m

//
//  TableViewController.m
//  testProject
//
//  Created by WZ on 03/10/2017.
//  Copyright © 2017 zeus. All rights reserved.
//

#import "DeviceInfoTableViewController.h"

@interface DeviceInfoTableViewController ()
    // @property (nonatomic, strong) NSArray *tableData;
@end

@implementation DeviceInfoTableViewController
{
    UITableView *tableView;
    NSArray *tableData;
    NSMutableArray *aMutableArray;
    NSMutableString *rowValue;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    rowValue = [NSMutableString stringWithString:@"Taiwan"];

    NSString *values[13];
    values[0] = @"Eezy";
    values[1] = @"Tutorials";
    values[2] = @"Website"; // Website ignored since count is 2 
    values[3] = @"Tutorials4";
    values[4] = @"Tutorials5";
    values[5] = @"Tutorials6";
    values[6] = @"Tutorials7";
    values[7] = @"Tutorials8";
    values[8] = @"Tutorials9";
    values[9] = @"Tutorials10";
    values[10] = @"Tutorials11";
    values[11] = @"Tutorials12";
    values[12] = @"Tutorials13";

    tableData = [NSArray arrayWithObjects:values count:13];
    NSLog(@"%@",tableData);

    aMutableArray = [NSMutableArray arrayWithArray:tableData];

    tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];

    // must set delegate & dataSource, otherwise the the table will be empty and not responsive
    tableView.delegate = self;
    tableView.dataSource = self;

    tableView.backgroundColor = [UIColor cyanColor];

    // add to canvas
    [self.view addSubview:tableView];
}

#pragma mark - UITableViewDataSource
// number of section(s), now I assume there is only 1 section
- (NSInteger)numberOfSectionsInTableView:(UITableView *)theTableView
{
    return 1;
}

// number of row in the section, I assume there is only 1 row
- (NSInteger)tableView:(UITableView *)theTableView numberOfRowsInSection:(NSInteger)section
{
    // return 1;
    // return [tableData count];
    // return (tableData.count - 1);
    NSLog(@"aMutableArray count: %ld", (unsigned long)[aMutableArray count]);
    return [aMutableArray count];
    // return 50;
}

// the cell will be returned to the tableView
- (UITableViewCell *)tableView:(UITableView *)theTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *cellIdentifier = @"Cell";

    // Similar to UITableViewCell, but 
    UITableViewCell *cell = (UITableViewCell *)[theTableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    }
    // Just want to test, so I hardcode the data
    cell.textLabel.text = @"Testing";
    NSLog(@"aMutableArray count: %ld", (unsigned long)[aMutableArray count]);
    NSLog(@"selected cell rowIndex: %ld", (long)indexPath.row);
    // These code below will crash the app
    // NSInteger row = indexPath.row;
    // rowValue = [aMutableArray objectAtIndex:row];
    // NSLog(@"selected cell rowValue: %@", rowValue);
    // cell.textLabel.text = rowValue;

    return cell;
}

#pragma mark - UITableViewDelegate
// when user tap the row, what action you want to perform
- (void)tableView:(UITableView *)theTableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    NSLog(@"selected %ld row", (long)indexPath.row);
}

@end