UITableview Crash when scroll up or down and how to set horizontal scroll view to every cell

Question

I want to display table view in which every cell contain nested UIview but i am facing some problems.

1) My app crash when i try to scroll table view.

Solved by add root view instead of subview into app delegate

Now problem number 2

2) I want to add horizontal scroll view inside table cell.so i can display 3 subview in single cell and i can scroll horizontally with in cell..how can i do that. I want to do this..

To achive this i have code this..

 - (id)initWithFrame:(CGRect)frame
  {
self = [super initWithFrame:frame];
if (self) {
    UIView *wagon = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 430, 187)];
    UIColor *background = [[UIColor alloc] initWithPatternImage:[UIImage imageNamed:@"wagon.png"]];
    wagon.backgroundColor = background;

    UIScrollView *scrollview = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 830, 187)];
    scrollview.showsVerticalScrollIndicator=YES;
    scrollview.scrollEnabled=YES;
    scrollview.userInteractionEnabled=YES;

   UIView *videoview = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 220 , 100)];

    UIImageView *video = [[UIImageView alloc]initWithFrame:CGRectMake(wagon.frame.origin.x+18, wagon.frame.origin.y+35, 220, 100)];
    UIImage *bgImage = [UIImage imageNamed:@"video.png"];
    video.image = bgImage;
    videoview.contentMode = UIViewContentModeLeft;
    [videoview addSubview:video];

    UIView *textview = [[UIView alloc]initWithFrame:CGRectMake(wagon.frame.origin.x+238,wagon.frame.origin.y+28, 150 , 187)];
    textview.contentMode = UIViewContentModeRight;
    UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(28,10, 150 , 87)];
    label.text=@"This is testing text for IOS app to check line are aligned or not and to check video image and nested views for UIviews";
    label.backgroundColor = [UIColor clearColor];
    label.textColor=[UIColor redColor];
    label.numberOfLines = 4;
    [textview addSubview:label];

    [wagon addSubview:textview];
    [wagon addSubview:videoview];
    [scrollview addSubview:wagon];
    [self addSubview:scrollview];       
  }
   return self;
   }

and call this view from table cell

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *CellIdentifier = @"StateCell";
UITableViewCell *cell;
cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
Wagon1 *wg=[[Wagon1 alloc]init];
[cell addSubview:wg];
return cell;

}

by adding wg i get one train boggi, wagon view.. i want 2 wagon view and engine at last or first.

** Table crashing problem is solve**

1) to solve crashing problem i search on stackoverflow and i found solution like adding to delegates or change to retain or strong bla bla.. but non of these work for me. Here is my code. and one more thing i am not use XIB , nib or storyboard..

@interface MainScreenViewController : UIViewController 
{
UITableView* table;
 NSString * name;
 }
 @property (strong, retain) UITableView *table;
 @property (strong, retain) NSString *name;;
 @end

.m file

@interface MainScreenViewController ()
@end
@implementation MainScreenViewController
@synthesize table;
@synthesize name;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil  
{
self = [super initWithNibName:Nil bundle:Nil];
if (self) {
    // Custom initialization
}
return self;
 }
- (void)viewDidLoad
 {
[super viewDidLoad];
name=[[NSString alloc]init];
name=@"testing of row";
CGRect frame = self.view.frame;
table= [[UITableView alloc] initWithFrame:frame];
table.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
[table setDelegate:self];// app crash here 
 table.dataSource = self;// here also 
[table reloadData];
   [self.view addSubview:table];
 }
 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 {
  return 8;
 }
 - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
  {
  return @"test";
  }

 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath: (NSIndexPath*)indexPath;
   {
  return 190;
  }
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
 {
// Return the number of sections.
return 1;
  }
 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
  {
   static NSString *simpleTableIdentifier = @"SimpleTableItem";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];

  if (cell == nil) {
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
}
cell.textLabel.text = name;
return cell;
  }
    - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {
  return (toInterfaceOrientation == UIInterfaceOrientationPortrait);
  }
 - (void)didReceiveMemoryWarning
  {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
   }
 @end

Answer 1

As you have mentioned

i have added both but still it crash..i got this 2013-04-23 12:37:28.361 AMM[2231:c07] Application windows are expected to have a root view controller at the end of application launch 2013-04-23 12:37:32.533 AMM[2231:c07] * -[MainScreenViewController respondsToSelector:]: message sent to deallocated instance 0x71edb70

In the application delegate file have you added the mainview controller to window's rootviewcontroller? Also could you try with some hardcoded text instead of assigning name to cell text.

Answer 2

I tried your code and it is working perfectly for me , I guess problem should be with view controller initialisation , try this Applications are expected to have a root view controller at the end of application launch and let me know.

Answer 3

Here, Check this is happening in App Delegate:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.viewController = [[MainScreenViewController alloc] initWithNibName:@"MainScreenViewController" bundle:nil];
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
}

and in MainScreenViewController.m

@interface MainScreenViewController () <UITableViewDataSource,UITableViewDelegate>

@property (nonatomic, strong)UITableView * table;
@property (nonatomic, strong)NSString * name;

@end

@implementation MainScreenViewController
@synthesize table,name;

- (void)viewDidLoad
{
    [super viewDidLoad];

    name = [[NSString alloc]init];
    name  = @"testing of row";

    CGRect frame = self.view.frame;

    table = [[UITableView alloc] initWithFrame:frame];
    table.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
    [table setDelegate:self];
    [table setDataSource:self];

    [self.view addSubview:table];

    // Do any additional setup after loading the view, typically from a nib.
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return 8;
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    return @"Test";
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath: (NSIndexPath*)indexPath;
{
    return 190;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *simpleTableIdentifier = @"SimpleTableItem";

    UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];

    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
    }
    //    cell.textLabel.text = name;

    // Add UIScrollView for Horizontal scrolling.

    NSArray * colors = [NSArray arrayWithObjects:[UIColor redColor], [UIColor greenColor],[UIColor blueColor],[UIColor orangeColor], [UIColor blackColor],[UIColor purpleColor], nil];
    UIScrollView * scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0.0,0.0,320.0,190.0)];
    scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * colors.count,scrollView.frame.size.height);

    for (int i = 0; i < colors.count; i++) {
        CGRect frame;
        frame.origin.x = scrollView.frame.size.width * i;
        frame.origin.y = 0;
        frame.size = scrollView.frame.size;

        UIView *subview = [[UIView alloc] initWithFrame:frame];
        subview.backgroundColor = [colors objectAtIndex:i];
        [scrollView addSubview:subview];
    }

    [cell.contentView addSubview:scrollView];

    return cell;
}