Sustituir imagen

.m

if(botonActivo != nil){

botonActivo.frame = CGRectMake(botonActivo.frame.origin.x+30, botonActivo.frame.origin.y, botonActivo.frame.size.width-60, 

  botonActivo.frame.size.height-60);

botonActivo.highlighted = NO;

botonActivo.enabled = YES;

botonActivo.contentEdgeInsets = UIEdgeInsetsMake(-44.00, 3, 0, 0);

botonActivo.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;

[botonActivo setBackgroundImage:[UIImage imageNamed:@"pato.png"] forState:UIControlStateNormal];

[[botonActivo titleLabel] setFont:[UIFont fontWithName:@"Baskerville" size:48]];

}

botonClicked.frame = CGRectMake(botonClicked.frame.origin.x-10, botonClicked.frame.origin.y, 

botonClicked.frame.size.width+5, botonClicked.frame.size.height+5);

botonClicked.showsTouchWhenHighlighted = YES;

[botonClicked setBackgroundImage:[UIImage imageNamed:@"pato_sobre.png"] forState:UIControlStateNormal];

botonClicked.enabled = NO;

botonClicked.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;

botonClicked.contentEdgeInsets = UIEdgeInsetsMake(-70.00, 4, 0, 0);

[[botonClicked titleLabel] setFont:[UIFont fontWithName:@"Baskerville" size:75]];

botonClicked.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;

[botonActivo setBackgroundImage:[UIImage imageNamed:@"pato.png"] forState:UIControlStateNormal];

botonActivo = botonClicked;