[我正在尝试点击附件视图时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),但是它忽略了动画(或者在其他情况下,甚至不进行更改。)如何使动画正常工作?
- (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调度此事件,但是它没有任何效果。它应该已经在主队列中。
首先,您不需要呼叫beginUpdates
或endUpdates
。其次,您不能为标签文本值的变化制作动画。
您需要在单元格上贴上标签,并将alpha
属性初始化为0.0。调用accessoryButtonTappedForRowWithIndexPath
时,在动画块内将alpha属性设置为1.0。
- (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;
}];
}