animateWithDuration in UITableViewCell's setSelected method has no effect

Question

I'm trying a simple animation for selection/deselection of a UITableViewCell like this:

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {

    [UIView animateWithDuration: 0.5 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{

        tabConstraint.constant = selected ? 40 : 20;

    } completion:nil];
}

The code inside the animations block will be called, but it's not animating. Everything works fine, but there's not any animation at all. How could I make the cell selection animated?

What do you have inside the //code part? You just commented out the most important part of the entire snippet. — Schemetrical, May 07 '15 at 09:38

score 2 · Accepted Answer · edited May 07 '15 at 10:22

2

Every time you update a autolayout constraint, you have to call layoutIfNeeded,

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {


    [UIView animateWithDuration: 0.5 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{

        tabConstraint.constant = selected ? 40 : 20;
        [self layoutIfNeeded];

    } completion:nil];
}

edited May 07 '15 at 10:22

Display Name

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answered May 07 '15 at 09:56

Gokul G

698
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Welcome to SO! You can format your code with 4 spaces or the {} button. – Display Name May 07 '15 at 10:08

score 2 · Answer 2 · edited May 23 '17 at 10:28

2

You need to call layoutIfNeeded in your animations block. Check out the accepted answer on this question for more details: How do I animate constraint changes?

edited May 23 '17 at 10:28

Community

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answered May 07 '15 at 09:57

bgilham

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score 0 · Answer 3 · answered May 07 '15 at 09:58

You need to call layoutIfNeeded() inside the animation block :-)

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {

    tabConstraint.constant = selected ? 40 : 20;
    [UIView animateWithDuration: 0.5 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
        whateverTabYouHaveHere.layoutIfNeeded()
    } completion:nil];
}

animateWithDuration in UITableViewCell's setSelected method has no effect

3 Answers3