Queueing Animations using blocks - iphone

Question

In my didSelectRowAtIndexPath method I call [self dismissView]; when the user selects a cell in order to dismiss the view if its already been presented. This clearly isn't very optimal and its overriding the presentView method without it animating the dismissView. Is there a better way to do this? Or at the very least let it wait for the view to finish animating without using NSTimer.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath;
{
[self dismissView];
// Do xyz...
[self presentView:twitterLinksView];
Then..
- (void)presentView:(id)sender
{
twitterLinksView.frame = CGRectMake(0, (self.view.frame.size.height + viewHeight), 320, 300);
[UIView animateWithDuration:0.60f animations:^{
CGRect twitterLinkFrame = self.twitterLinksView.frame;
twitterLinkFrame.origin.y = (self.view.frame.size.height - viewHeight);
twitterLinksView.frame = twitterLinkFrame;
}];
}
- (void)dismissView
{
[UIView animateWithDuration:0.75f animations:^{
CGRect twitterLinkFrame = self.twitterLinksView.frame;
twitterLinkFrame.origin.y = (self.view.frame.size.height + viewHeight);
self.twitterLinksView.frame = twitterLinkFrame;
}];
}

Answer 1

[UIView animateWithDuration:1. animations:^{
//firstAnimationBlock
} completion:^(BOOL finished){
[UIView animateWithDuration:1. animations:^{
//animations in this block will be called after firstAnimationBlock has expired
}];
}];
as i understand you wanna fire 2 animation one after the other. this code (block inside block) makes this
this part is after edit:
ok now you can try writing like that
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath;
{
[self dismissView];
// Do xyz...
[self performSelector:#selector(presentView:) withObject:twitterLinksView afterDelay:0.75];
//[self presentView:twitterLinksView];
}

Answer 2

I ended up splitting out my creation method and using [[self.view subviews] containsObject:twitterLinksView] to check for the view. Also to be noted is [self performSelector:#selector(createView) withObject:twitterLinksView afterDelay:0.76f] had to be very slightly ahead of the dismissing animation for it to work at all... yeah wtf.
In the didSelectRowAtIndexPath method i used [self performSelector:#selector(presentView:)];
Thanks to meth for solving part of the puzzle.
- (void)presentView:(id)sender
{
if ([[self.view subviews] containsObject:twitterLinksView])
{
[self dismissView];
[self performSelector:#selector(createView) withObject:twitterLinksView afterDelay:0.76f];
NSLog(#"Animating ut old");
}
else
{
NSLog(#"Creating new view");
[self createView];
}
}
-(void)createView
{
twitterLinksView.frame = CGRectMake(0, (self.view.frame.size.height + viewHeight), 320, 300);
[UIView animateWithDuration:0.60f animations:^{
CGRect twitterLinkFrame = self.twitterLinksView.frame;
twitterLinkFrame.origin.y = (self.view.frame.size.height - viewHeight);
twitterLinksView.frame = twitterLinkFrame;
[self.view addSubview:twitterLinksView];
}];
}
- (void)dismissView
{
[UIView animateWithDuration:0.75f animations:^{
CGRect twitterLinkFrame = self.twitterLinksView.frame;
twitterLinkFrame.origin.y = (self.view.frame.size.height + viewHeight);
self.twitterLinksView.frame = twitterLinkFrame;
}completion:^(BOOL finished){
[twitterLinksView removeFromSuperview];
}];
}