How to just navigate through on a button click when i am working on tableviewcell.h file

Question

I am using a button on UITableViewCell but the button coding is done on UITableViewCell.m file. I have made a selector on UIButton touchUpInside but when on selector when I used the code to UINavigationController it is not allowing me as it is not a UIViewController. Kindly help.

Answer 1

You can track your event from your table view cell to view controller using protocol as well,

Example:

in your MyCell.h

@protocol CellDelegate

-(void)itemSelected;

@end

@interface MyCell : UITableViewCell

@property (nonatomic, assign) id<CellDelegate> delegate;

@end

in your MyCell.m

@implementation MyCell    

@synthesize delegate;

-(id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
   self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];

    if (self)
    {
        UIButton * button = [[UIButton alloc] initWithFrame:CGRectMake(200.0, 5.0, 100.0, 40.0)];

        [button addTarget:self action:@selector(itemSelected) forControlEvents:UIControlEventTouchUpInside];

        button.backgroundColor = [UIColor redColor];

        [self addSubview:button];

        button = nil;
    }

    return self;
}

-(void)itemSelected
{
    [delegate itemSelected];
}

@end

in your ViewController.h

 @interface ViewController : UIViewController <CellDelegate>

in your ViewController.m

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString * cellID = @"CellID";

    MyCell * cell = (MyCell *) [tableView dequeueReusableCellWithIdentifier:cellID];

    if (!cell)
    {
        cell = [[MyCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID];

        cell.delegate = self;
    }

    return cell;
}

//Cell Delegate Method
-(void)itemSelected
{
   //Your navigation action here
}

Thanks!

Answer 2

You need to use the delegate protocol. See my answer here on how to create a delegate:

How to declare events and delegates in Objective-C?

Also, post some code on what you have tried and also how you create your cells.

Answer 3

Remove the button action from UITableViewCell.h and its definition from UITableViewCell.m file. Instead just make an property outlet in tableviewcell.h file. Then in UIViewController cellForRowAtIndexPath: method just add target selector on the cell buttton. Ex -

[cell.myButton addTarget:self action:@selector(pushViewControllerNow) forControlEvents:UIControlEventTouchUpInside];

Then just implement this method in the same UIViewController.m

-(void) pushViewControllerNow {
    YourViewController vc = ....//Instantiate your view controller from nib
    [self.navigationController pushViewController:vc animated:YES];
}

Answer 4

You can post a notification when the button is tapped. Handle this notification in your view controller and push next view controller;

Like this:

In your ViewController subscribe to receive the notification. This can be done in viewDidLoad for example:

 [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(timeToPushViewController:)
                                                 name:ButtonOnCellTappedNotification
                                               object:nil];

and provide corresponding method:

- (void)timeToPushViewController:(NSNotification *)notification
{
   NSDictionary *userInfo = [notification userInfo];

   NSString *userId = userInfo[@"user_id"];

   [self.navigationController pushViewController:[[MyViewController alloc] initWithUserId:userId]];
}

then provide method for tapped button:

- (void)buttonOnCellTapped:(UIButton *)sender
{
  NSNotification *notification = [NSNotification notificationWithName:ButtonOnCellTappedNotification
                                                              object:nil
                                                            userInfo:@{
@"user_id" : @"some_user_id"

}];

  [[NSNotificationCenter defaultCenter] postNotification:notification];

}

This is all you need)))