iOS：强制tableView单元在点击时动画化更改 [英] IOS: Force tableView cell to animate change on tap

问题描述

点击附件视图时，我试图在单元格上执行动画。点击的委托方法正在触发，我可以让该行执行某些操作（更改标签），但它忽略了动画（或者在其他情况下，甚至没有进行更改。）如何使动画正常工作？

I am trying to perform an animation on a cell when the accessory view is tapped. The tapped delegate method is firing and I can get the row to do something--change label, but it is ignoring the animation (or in another case--not even making the change.) How can I get the animation to work properly?

- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath{

    MyCustomCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];

                    [UIView animateWithDuration:5.0
                                    delay: 5.0
                                    options: UIViewAnimationOptionCurveEaseIn
                                                                 animations:^{
//NEXT TWO LINES HAVE NO EFFECT ON CELL SO COMMENTED OUT
//cell.nameLabel.text = @"Thank you. FIRST ANIMATE TRY";                              
// [self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
//NEXT THREE LINES CHANGE TEXT BUT WITHOUT ANIMATION
[self.tableView beginUpdates];
cell.nameLabel.text = @"Thank you. Second try!";
[self.tableView endUpdates];                                                                                
                             }
                             completion:^(BOOL finished){
                                 NSLog(@"animation finished");
                             }];     
    }

BTW我也尝试在主队列中显式分派此命令，但没有效果。它应该已经在主队列中。

BTW I also tried explicitly dispatching this in the main queue but it had no effect. It should already be in main queue.

推荐答案

首先，您不需要调用 beginUpdates 或 endUpdates 。其次，您不能为标签文本值的变化设置动画。

First of all, you don't need to call beginUpdates or endUpdates. Second, you can't animate the change of a label's text value.

您需要做的是在单元格上放置标签并初始化 alpha 属性设置为0.0。调用 accessoryButtonTappedForRowWithIndexPath 时，请将动画块内的alpha属性设置为1.0。

What you need to is have a label on the cell and initialize the alpha property to 0.0. When accessoryButtonTappedForRowWithIndexPath is called set the alpha property to 1.0 inside of your animation block.

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    AwesomeCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
    cell.thankYouLabel.text = @"Thank you";
    cell.thankYouLabel.alpha = 0.0;
    return cell;
}

- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath
{
    AwesomeCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    [UIView animateWithDuration:1.0 animations:^{
        cell.thankYouLabel.alpha = 1.0;
    }];
}

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