Table view crashes when I click on TableView cell - ios

Question

I am getting a crash (app quits in iOS simulator) when I click on a cell. The error code is
"EXC_BAD_ACCESS (code = 1, address= 0x310cc493)
Here is the code:
// .h
#import <UIKit/UIKit.h>
#interface ChecklistsViewController : UITableViewController
#end
// .m
#import "ChecklistsViewController.h"
#interface ChecklistsViewController ()
#end
#implementation ChecklistsViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 100;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"ChecklistItem"];
UILabel *label = (UILabel *)[cell viewWithTag:1000];
if (indexPath.row % 5 == 0) {
label.text = #"Walk the dog";
} else if (indexPath.row % 5 == 1) {
label.text = #"Brush my teeth";
} else if (indexPath.row % 5 == 2) {
label.text = #"Learn iOS development";
} else if (indexPath.row % 5 == 3) {
label.text = #"Soccer practice";
} else if (indexPath.row % 5 == 4)
label.text = #"Eat ice cream";
return cell;
}
- tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[tableView deselectRowAtIndexPath:indexPath animated:YES];
} // Control reaches end of non-function
#end

Answer 1

In your example you do not allocate a UITableViewCell if none was dequeued. You need to do something like this:
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"ChecklistItem"];
if( cell == nil ) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:#"ChecklistItem"] autorelease];
// whatever additional initialization
...
}

Answer 2

You need to allocate the UITableViewCell in tableView: cellForRowAtIndexPath: method.
Your method should be like this:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier = #"Cell";
UItableViewCell *cell = (UITableViewCell *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UItableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
//INSERT YOUR CODE
}

Answer 3

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier = #"Cell";
UItableViewCell *cell = (UITableViewCell *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UItableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
//write your code here
return cell;
}