Forward event from custom UIControl subclass

Posted by ggould75 on Stack Overflow See other posts from Stack Overflow or by ggould75
Published on 2010-05-23T22:36:41Z Indexed on 2010/05/23 22:40 UTC
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My custom subclass extend UIControl (MyCustomUIControl) Basically it contains 3 subviews:

  • UIButton (UIButtonTypeCustom)
  • UIImageView
  • UILabel

All the class works great but now I want to connect some events generated from this class to another. In particular when the button is pressed I want to forward the event to the owner viewcontroller so that I can handle the event. The problem is that I can't figure out how to implement this behaviour. Within EditableImageView I can catch the touch event using [button addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside] but I don't know how to forward it inside of the buttonPressed selector. I also tried to implement touchesBegan but it seems never called...

I'd like to capture the button press event from the viewcontroller in this way:

- (void)viewDidLoad {
[super viewDidLoad];

self.imageButton = [[EditableImageView alloc] initWithFrame:CGRectMake(50.0f, 50.0f, 80.0f, 80.0f)];
[imageButton addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:imageButton];
[imageButton setEditing:NO];

}

This is my UIControl subclass initialization method:

- (id)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        [self setBackgroundColor:[UIColor clearColor]];

        button = [UIButton buttonWithType:UIButtonTypeCustom];
        button.frame = CGRectMake(0.0f, 0.0f, frame.size.width, frame.size.height);
        [button setImage:[UIImage imageNamed:@"nene_70x70.png"] forState:UIControlStateNormal];
        [button addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];

        [self addSubview:button];

        transparentLabelBackground = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"editLabelBackground.png"]];
        transparentLabelBackground.hidden = YES;
        [self addSubview:transparentLabelBackground];

        // create edit status label
        editLabel = [[UILabel alloc] initWithFrame:CGRectZero];
        editLabel.hidden = YES;
        editLabel.userInteractionEnabled = NO;  // without this assignment the button will not be clickable
        editLabel.textColor = [UIColor whiteColor];
        editLabel.backgroundColor = [UIColor clearColor];
        editLabel.textAlignment = UITextAlignmentLeft;
        UIFont *labelFont = [UIFont systemFontOfSize:16.0];
        editLabel.font = labelFont;     
        editLabel.text = @"edit"; 
        labelSize = [@"edit" sizeWithFont:labelFont];

        [self addSubview:editLabel];
    }

    return self;
}

Thanks.

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