Question

I am adding four to five views to the UIScrollview.

i am creating that views dynamically at run time.

all that views contain one button.

{

    UIButton *button=[UIButton buttonWithType:UIButtonTypeCustom];

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

}

views are successfully added, but when i am clicking button “unrecognized selector sent to instance 0x657e850” is shown. What am I doing wrong?

Answer 1

You need to implement the category_selected: method in your controller. The signature should look like this:

- (void)category_selected:(UIButton*)sender
{
    // The sender is the button that was pressed.
}

When you set up the button like this:

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

I am assuming that you are calling this from your controller, so self is the controller, and that is the class that must have the category_selected: implemented.