Custom accessoryView image and accessoryButtonTappedForRowWithIndexPath - objective-c

Question

I am trying to get a custom image working with the accessoryButtonTappedForRowWithIndexPath function. From what I understand in order to do this, you have to use a UIButton, simply adding a UIImageView on the UITableViewCellAccessoryDetailDisclosureButton will not work.
My problem is how to get the touch gesture from my UITableViewCell subclass into the parent UITableView function.
Here is the code in my UITableViewCell subclass:
upVote = [UIButton buttonWithType:UIButtonTypeCustom];
UIImage *upVoteImg = [UIImage imageNamed:#"vote.png"];
upVote.frame = CGRectMake(self.frame.size.width-upVoteImg.size.width, 0, upVoteImg.size.width , upVoteImg.size.height);
[upVote setBackgroundImage:upVoteImg forState:UIControlStateNormal];
[self.contentView addSubview:upVote];
[upVote addTarget:self action:#selector(checkButtonTapped:event:) forControlEvents:UIControlEventTouchUpInside];
The calling function (also inside the subclass of the UITableViewCell)
- (void)checkButtonTapped:(id)sender event:(id)event
{
UITableView *tableView = (UITableView *)self.superview;
[tableView.delegate tableView:tableView accessoryButtonTappedForRowWithIndexPath:[tableView indexPathForCell:self]];
}
It crashes at the final line of the above function with this:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UITableViewWrapperView
delegate]: unrecognized selector sent to instance 0x16f48160'

Answer 1

Yes it should crash, because delegate of tableview should not be called from custom cell class, better you can use custom delegate. I am posting a sample code, similar to your case, when button tapped it call's the custom delegate method from that u can do whatever you want
//in custom calss
#import <UIKit/UIKit.h>
//create a delegate
#protocol CustomDelegate<NSObject>
-(void)whenButtonTapped:(id)sender; //your delegate method
#end
#interface CustomCell : UITableViewCell<CustomDelegate>
#property(nonatomic, assign)id<CustomDelegate> delegate; //create delegate
#end
//.m file of custom cell
#import "CustomCell.h"
#implementation CustomCell
#synthesize delegate; //sysnthesize delegate
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
// Initialization code
UIButton *aButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; //its your button
UILabel *aLabel = [[UILabel alloc]initWithFrame:CGRectZero]; //for example i took label
[aButton addTarget:self action:#selector(whenButtonTapped:) forControlEvents:UIControlEventTouchUpInside];//adding target for button action
[aButton setTag:100];
[aLabel setTag:200];
[self addSubview:aButton];
[self addSubview:aLabel];
//since i am using without ARC
[aLabel release];
}
return self;
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
-(void)dealloc
{
delegate = nil;
[super dealloc];
}
//i am setting the frames hear
-(void)layoutSubviews
{
[super layoutSubviews];
UIButton *aButton = (UIButton *)[self viewWithTag:100]; //get button
aButton.frame = CGRectMake(200, 5, 55, 40);
[aButton setTitle:#"tapMe" forState:UIControlStateNormal];
UILabel *label = (UILabel *) [self viewWithTag:200]; //get label
label.frame = CGRectMake(40, 5, 50, 35);
label.text = #"hello";
}
//hear is ur button's target
- (void)whenButtonTapped:(id)sender
{
//dont call UITableView delegate method in custom cell it is wrong, ur app get crashed
//insted create custom delegate method to your controller
[self.delegate whenButtonTapped:sender];//call the delegate method when button tapped
}
#end
//.h file where u are using custom cell
#import <UIKit/UIKit.h>
#import "CustomCell.h"
#interface ViewController : UIViewController<UITableViewDataSource , UITableViewDelegate ,CustomDelegate>//set confirms to delegate
#property (retain, nonatomic) IBOutlet UITableView *aTableView;
#end
//.m file
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
CustomCell *aCell = [self.aTableView dequeueReusableCellWithIdentifier:#"cell"];
if(aCell == nil)
{
aCell = [[CustomCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"cell"];
}
aCell.delegate = self;//set delegate to this class
return aCell;
}
//hear is your delegate method
//define your delegate method hear
-(void)whenButtonTapped:(UIButton *)sender
{
//in this method u can do what ever the activity when button tapped
//sender which gives u entire cell information
UITableViewCell *cell = sender.superview;//you can get cell also :)
NSLog(#"button tapped");
}
Hopes this helps

Answer 2

How about a better one?
UITableView *tableview;
if ([self.superview respondsToSelector:#selector(indexPathForCell:)] ) {
tableview = (UITableView *)self.superview;
} else if ([self.superview.superview respondsToSelector:#selector(indexPathForCell:)]) {
tableview = (UITableView *)self.superview.superview;
}
if (tableview) {
// win
}

Answer 3

I have a category on UITableViewCell that looks like this.
- (UITableView *)tableView
{
UIView *view = self.superview;
while (view)
{
if ([view isKindOfClass:[UITableView class]])
{
return (UITableView *)view;
}
else
{
view = view.superview;
}
}
return nil;
}
- (NSIndexPath *)indexPath
{
return [[self tableView]indexPathForCell:self];
}
Then I just hook my custom button up to a method in my custom tableview cell (which imports my category) to a method such as this.
- (IBAction)customButtonPressed:(id)sender
{
[self.tableView.delegate tableView:self.tableView accessoryButtonTappedForRowWithIndexPath:self.indexPath];
}