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POObjective c - Best practice to handle a button touch event for a button of a custom UITableViewCell
 

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  1. POObjective c - Best practice to handle a button touch event for a button of a custom UITableViewCell
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    <p>What is best practice to handle a button touch event for a button of a custom <code>UITableViewCell</code>? </p> <p>my classes: <code>MyViewController</code>, <code>MyCustomCell</code></p> <p>I can think of three options: </p> <p><strong>First option-</strong> Have the button as a property of <code>MyCustomCell</code>, and then add a target to it in the <code>MyViewController</code> .m file with <code>MyViewController</code> as the target.</p> <p><code>MyViewController</code> .m file</p> <pre><code>- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"customCell"; MyCustomCell *cell = (MyCustomCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[MyCustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; [cell.theButton addTarget:self action:@selector(theButtonTapped:) forControlEvents:UIControlEventTouchUpInside]; } // Configure the cell... [self configureCell:cell atIndexPath:indexPath]; return cell; } - (void)theButtonTapped:(UIButton *)sender { MyCustomCell *selectedCell = (MyCustomCell *)sender.superview; if (selectedCell) { NSIndexPath *indexPath = [self.tableView indexPathForCell:selectedCell]; MyModel *selectedModel = [self.model objectAtIndex:indexPath.row]; // do something with the model... } } </code></pre> <p><strong>Second option-</strong> If the custom cell was made in IB, Set the nib File's Owner to be <code>MyViewController</code>, implement <code>buttonTapped:</code> method in <code>MyViewController</code> and connect the button's Touch Up Inside event to the <code>buttonTapped:</code> method.</p> <p><strong>Third option-</strong> if the custom cell wasn't made in IB, add a target to the button in the <code>MyCustomCell</code> .m file with <code>MyCustomCell</code> as the target.<br> Define a <code>MyCustomCellDelegate</code> add <code>@property (nonatomic, assign) id&lt;MyCustomCellDelegate&gt; delegate</code> to <code>MyCustomCell</code> and call this delegate when button tapped.<br> Set <code>MyViewController</code> as the cell's delegate when creating cells and implement the <code>MyCustomCellDelegate</code> protocol.</p> <p><code>MyCustomCell</code> .h file </p> <pre><code>@class MyCustomCell; @protocol MyCustomCellDelegate &lt;NSObject&gt; - (void)buttonTappedOnCell:(MyCustomCell *)cell; @end @interface MyCustomCell : UITableViewCell @property (nonatomic, retain) UIButton *theButton; @property (nonatomic, assign) id&lt;MyCustomCellDelegate&gt; delegate; @end </code></pre> <p><code>MyCustomCell</code> .m file </p> <pre><code>- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier { self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]; if (self) { // Initialization code self.theButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; self.theButton.frame = CGRectMake(10,10,50,30); [self addSubview:self.theButton]; [self.theButton addTarget:self action:@selector(theButtonTapped:) forControlEvents:UIControlEventTouchUpInside]; } return self; } - (void)theButtonTapped:(UIButton *)sender { [self.delegate buttonTappedOnCell:self]; } </code></pre> <p><code>MyViewController</code> .m file</p> <pre><code>- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"customCell"; MyCustomCell *cell = (MyCustomCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[MyCustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; cell.delegate = self; } // Configure the cell... [self configureCell:cell atIndexPath:indexPath]; return cell; } - (void)buttonTappedOnCell:(MyCustomCell *)selectedCell { if (selectedCell) { NSIndexPath *indexPath = [self.tableView indexPathForCell:selectedCell]; MyModel *selectedModel = [self.model objectAtIndex:indexPath.row]; // do something with the model... } } </code></pre>
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    1. COI would go with option 1. It seems the most readable for me. I use a similar approach, but I set the delegate in the custom cell and handle the button in the custom cell itself and then call a function in the view controller by checking if the delegate is there.
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      1. POObjective c - Best practice to handle a button touch event for a button of a custom UITableViewCell
      1. USRick van der Linde
 

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