Iphone CATTransition动画有时会崩溃

我正在应用程序中使用CATTransition动画，它工作正常，但有时会崩溃

这是我的代码：

-(void)_close_btn_click:(UIButton*)button
{

  NSLog(@"update Button %ld clicked.",(long int)[button tag]);    
  NSInteger intvalue=[[NSString stringWithFormat:@"%ld",(long int)[button tag]]intValue];    
  NSLog(@"delete_index:%d",intvalue);    
  CATransition* transition = [CATransition animation];    
  [transition setDuration:1.0];    
  transition.type = @"rippleEffect";    
  transition.subtype = kCATransitionFromLeft;    
  transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];    

  [cell._slide_view.layer addAnimation:transition forKey:@"push-transition"];    
  CATransition* transition1 = [CATransition animation];    
  [transition1 setDuration:1.0];    
  transition1.type = @"rippleEffect";    
  transition1.subtype = kCATransitionFromLeft;    
  [cell._en_cell_close_btn.layer addAnimation:transition forKey:@"push-transition"];
  cell._slide_view.hidden=YES;    
}

---

我猜在你调用这个方法之前，你的

单元格

或

幻灯片视图

可能已经被释放了

崩溃日志、异常名称等等？我真的不明白，为什么人们会这样写代码：

NSInteger intvalue=[[NSString stringWithFormat:@“%ld”，（long int）[button tag intvalue]