Can't interact with UITableView while animations are in progress

问题

I'm trying to implement an animation that happens when a user taps one of my tableview cells. Basically, the animation is just a little label with text like "+5" or "+1" that appears, then moves upwards whilst fading (basically like points appear in video games as the user scores them).

In the tableView:didSelectRowAtIndexPath: implementation of my controller, I'm doing the following (paraphrased for simplicity here):

CGRect toastFrame = /* figure out the frame from the cell frame here */;
UILabel *toast = [[UILabel alloc] initWithFrame:toastFrame];
toast.text = [NSString stringWithFormat:@"+%d", 5];
toast.backgroundColor = [UIColor clearColor];
toast.userInteractionEnabled = NO; // hoped this would work but it doesn't
[tableView addSubview:toast];

[UIView
 animateWithDuration:1.0
 animations:^
 {
     toast.alpha = 0.0;
     toast.transform = CGAffineTransformMakeTranslation( 0.0, -44.0 );
 }
 completion:^ (BOOL finished)
 {
     [toast removeFromSuperview];
 }];

[toast release];

The toast is appearing nicely and looks great. The problem is that until the animation completes, the tableview stops receiving touch events. This means that for one second after tapping a cell in the tableview, you can't tap any other cells in the tableview.

Is there a way to stop this from happening and allow the user to keep interacting with the tableview as if the animations weren't happening at all?

Thanks in advance for any help with this.

回答1:

Another option may be to use animateWithDuration:delay:options:animations:completion: (untested, from the top of my head)

Take a look at the options parameter and the possible flags, defined by UIViewAnimationOptions. Included there is a flag called UIViewAnimationOptionAllowUserInteraction. This could be a solution, maybe you should try it out!

回答2:

Have you tried doing it the other way? For example, after adding toast as a subview, you can do something like this:

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationCurve: UIViewAnimationCurveEaseOut];
[UIView setAnimationDuration: 1.0];
toast.alpha = 0.0;
toast.frame.origin.y -= 44.0;
[toast performSelector:@selector(removeFromSuperview) withObject: nil afterDelay: 1.0];
[UIView commitAnimations];

and then release toast. You can try it this way and see if it works.

来源：https://stackoverflow.com/questions/5283550/cant-interact-with-uitableview-while-animations-are-in-progress

标签

iphone

animation

uitableview