Question

I have a question …

I have Custom TableViewCell class:

// Class for Custom Table View Cell.
@interface CustomTableViewCell : UITableViewCell {
    // Title of the cell.
    UILabel*     cellTitle;
    // Switch of the cell.
    UISwitch*    cellSwitch;
}

How you can see in my custom UITableViewCell I have Label and Switch controller.

- (id)initWithStyle: (UITableViewCellStyle)style reuseIdentifier: (NSString *)reuseIdentifier tableType:(TableTypeEnumeration)tabletypeEnum {
        // Get Self.
        self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
        if (self) {
            // Create and initialize Title of Custom Cell.
            cellTitle = [[UILabel alloc] initWithFrame:CGRectMake(10, (44 - TAGS_TITLE_SIZE)/2, 260, 21)];
            cellTitle.backgroundColor      = [UIColor clearColor];
            cellTitle.opaque               = NO;
            cellTitle.textColor            = [UIColor blackColor];
            cellTitle.highlightedTextColor = [UIColor whiteColor];
            cellTitle.font                 = [UIFont boldSystemFontOfSize:TAGS_TITLE_SIZE];
            cellTitle.textAlignment        = UITextAlignmentLeft;
            // Create and Initialize Switch of Custom Cell.
            cellSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(185, 10, 10, 10 )];

            [self.contentView addSubview:cellTitle];
            [self.contentView addSubview:cellSwitch];

            [cellTitle release];
            [cellSwitch release];
        }
        return self;
}

Now when I use my custom cell in TableView I want to catch event when user change the state of switch. How can I do that ?

Answer 1

You have to write method for value change as below:

[cellSwitch addTarget:self action:@selector(valueChange:) forControlEvents:UIControlEventValueChanged];

Then you have to implement delegate

@protocol SwitchDelegate <NSObject>
- (void)valueChangeNotify:(id)sender;
@end

then you have to make object id delegate and synthesis with (nonatomic, assign) propertly and method as below:

- (void)valueChange:(id)sender{
  if ([delegate respondToSelector:@selector(valueChangeNotify:)])
    [delegate valueChangeNotify:sender];
}

By this way, you can get notify state change in view controller.