Custom Segue doesn't animate - ios

Question

I have set up a custom dialog to appear via a custom segue when a button in a container view controller is pressed, the perform function is being called and everything appears to work just fine except for the animation.
Here is the segue on the storyboard:
Here is the button:
Here is the code for the segue:
#import "TimerDialogSegue.h"
#implementation TimerDialogSegue
-(void)perform
{
UIViewController *dst = [self destinationViewController];
//Doesn't appear work with the Timer View Controller as the source
// so I use the parent Home View Controller
UIViewController *src = [self sourceViewController];
src = src.parentViewController;
// set the view frame
CGRect frame;
frame.size.height = src.view.frame.size.height;
frame.size.width = src.view.frame.size.width;
frame.origin.x = src.view.bounds.origin.x;
frame.origin.y = src.view.bounds.origin.y;
dst.view.frame = frame;
// add the view to the hierarchy and bring to front
[src addChildViewController:dst];
[src.view addSubview:dst.view];
[src.view bringSubviewToFront:dst.view];
[UIView animateWithDuration:0.3f
animations:^
{
dst.view.alpha = 1.0f;
}];
}
#end
Here is the code from the Dialog that dismisses it, this part animates just fine
- (IBAction)cancelButtonPressed:(id)sender
{
[self dismiss:sender];
}
- (IBAction)dismiss:(id)sender
{
[UIView animateWithDuration:0.3f
animations:^
{
self.view.alpha = 0.0f;
}
completion:^(BOOL finished)
{
[self.view removeFromSuperview];
[self removeFromParentViewController];
}];
}
To summarize the Dialog appears and operates correctly the only issue is there is no animation when it appears. It does animate when it disappears. Anyone know how I might fix this or a workaround to animate this Dialog when it appears?
Thanks in advance for any help.

Answer 1

You are saying:
[UIView animateWithDuration:0.3f
animations:^
{
dst.view.alpha = 1.0f;
}];
But dst.view.alpha is 1 already so nothing happens. You can only animate a change.
For example, when you dismiss, you animate this:
self.view.alpha = 0.0f;
That works because self.view.alpha was 1 so there is actually a change to animate.