comment modifier l'image du bouton lorsque le bouton enfoncé

Vous pouvez définir des images pour les différents états du bouton appuyez sur. Voici un bref exemple:

UIButton *submitbutton = [UIButton buttonWithType:UIButtonTypeCustom];
//position in the parent view and set the size of the button
submitbutton.frame = CGRectMake(165, 20, 149, 39); 
[submitbutton setTitle:@"Submit Booking" forState:UIControlStateNormal];

//Add image to button for normal state
UIImage * btnImage1 = [UIImage imageNamed:@"SubmitBooking-normal.png"];
[submitbutton setImage:btnImage1 forState:UIControlStateNormal];

//Add image to button for pressed state
UIImage * btnImage2 = [UIImage imageNamed:@"SubmitBooking-pressed.png"];
[submitbutton setImage:btnImage2 forState:UIControlStateHighlighted];


//add targets and actions
[submitbutton addTarget:self action:@selector(submitBookingButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
//add to a some parent view.
[someview addSubview:submitbutton];

Il y a probablement d'autres choses que vous souhaitez personnaliser. Vous pouvez en savoir plus sur ces options ici