How can attributes be modified from the sender in swift? For example, if I have a multiple buttons that are connected to the same event handler, how can I modify the attributes of the button (say, the title) that was pressed?
@IBOutlet weak var grade_preK: UIButton!
@IBAction func gradeButtonPressed(sender: AnyObject) {
sender.title = "New Title"
}
The handler here returns the error "Cannot assign to 'title' in 'sender'". How then, can attributes be changed on the sender of the event?
When you created this, Interface Builder may have given you the option to declare sender to be UIButton rather than AnyObject (it does have that option; you may not have noticed it). You could have chosen that, or you can fix it now:
@IBAction func gradeButtonPressed(sender: UIButton) {
And now sender is of the right type so you can modify it (and it is reasonable style to do so in Cocoa).
(Note that UIButton actually has a setTitle(_ title: String?, forState state: UIControlState) method, not a setTitle() method, so that's what you probably meant to call.)
