Insert break / sleep after showing a hidden button

Question

I want to make a button appear, then I want to show it for 1 second and after that the view controller has to change. I tried my best. but it doesn't matter where I put the sleep(1); - it always does the same. It waits for 1 second, then displays the button for a very very short time and changes to the other view controller.

Can anyone help?

My code:

[self.resultButton setTitle:category forState:UIControlStateNormal];
self.resultButton.hidden = NO;

sleep(1);

UIViewController *vc = [[UIViewController alloc] init];
vc = [self.storyboard instantiateViewControllerWithIdentifier:@"mapViewControllerID"];

[self presentModalViewController:vc animated:YES];

Why is this tagged with `swift` when you're clearly using objective-c? — Ian MacDonald, Feb 05 '15 at 14:27

score 2 · Accepted Answer · answered Feb 05 '15 at 14:26

Use GCD's dispatch_after to accomplish this.

[self.resultButton setTitle:category forState:UIControlStateNormal];
self.resultButton.hidden = NO;

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
  UIViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:@"mapViewControllerID"];
  [self presentModalViewController:vc animated:YES];
});

You should also note that the view controller assignment that you've written creates a default UIViewController and then immediately throws that object away and assigns a view controller from your storyboard.

score 0 · Answer 2 · answered Feb 05 '15 at 14:18

To achieve this you can use NSTimer to call a specific function after a period of delay and in that function put the code to show new view controller

NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector:  Selector("showController"), userInfo: nil, repeats: false)

func showController(){

    //present view controller here
}

score 0 · Answer 3 · edited May 23 '17 at 12:28

0

I have used dispatch_after() like it is being described here

edited May 23 '17 at 12:28

Community

1
1

answered Feb 05 '15 at 14:30

ziogaschr

76
2
4

@ian-macdonald answer was faster and more accurate. – ziogaschr Feb 05 '15 at 14:33

Insert break / sleep after showing a hidden button

3 Answers3