Question

I’m trying to change the image of 25 buttons sequentially with delayed time between the changes and it doesn’t work.

The code is:

do {
    if (Anterior > -1) {
        [[BtnArray objectAtIndex(Anterior)] setImage:Nil];
    }
    [[BtnArray objectAtIndex:(Gira[J])]
       setImage:[NSImage imageNamed:@"Encen.png"]];
    Anterior = Gira[J];
    Delay(Espera,&junk);
    ++J;
} while (J<25);

Answer 1

Have not tested, but you could try something like this:

float delay = .2;
for (UIButton *btn in btnArray) {
    [btn performSelector:@selector(setImage:) withObject:[UIImage imageNamed:@"Encen.png"] afterDelay:delay];
    delay += .2;
}

Or in place of calling on btn have your own function

float delay = .2;
for (UIButton *btn in btnArray) {
    [self performSelector:@selector(changeImageForButton:) withObject:btn afterDelay:delay];
    delay += .2;
}

then in that function do:

[btn setImage:[UIImage imageNamed:@"Encen.png"] forState:UIControlStateNormal];