Question

I am programming a application in xcode, for iOs. I have a code like this:

- (void)buttonAction:(UIButton*)sender{

    UIView *figure = (UIView *) [figures objectAtIndex:sender.tag];

    [figure.layer setBorderWidth:2.0f];
    [figure.layer setBorderColor: [UIColor greenColor].CGColor];
    sleep(1);
    [self cleanScreen];

}

- (void) cleanScreen {

    //Some code to hide all view objects

}

I hope that changes the border color and width are reflected on the screen for 1 second before the items are deleted by cleanScreen function. But it happens that these changes are not reflected and spent one second elements are deleted.

I want refresh screen before cleanScreen is called.

How to get the effect I want?

Thanks in advance!

Answer 1

instead of:

sleep(1);

use:

[self performSelector:@selector(cleanScreen) withObject:nil afterDelay:1];

with sleep() you are freezing the whole application