坑爹小问题-table改变frame动画影响cell
反正就是很坑爹.简单说就是这样吧,做一个简单的聊天界面,对话框左一个右一个那样子.(界面可以脑补微信)底下的键盘弹起来时候,展示对话的table的frame要相应的缩小,隐藏键盘又要恢复.就这么简单一个代码:
1 - (void)keyboardFrameChange:(NSNotification *)sender 2 { 3 NSDictionary *userInfo = sender.userInfo; 4 CGRect keyboardFrame; 5 [[userInfo valueForKey:UIKeyboardFrameEndUserInfoKey] getValue: &keyboardFrame]; 6 NSNumber *duration = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey]; 7 NSNumber *curve = [userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey]; 8 9 //坑爹的frame调整动画 10 [UIView beginAnimations:nil context:nil]; 11 [UIView setAnimationDelegate:self]; 12 [UIView setAnimationDuration:[duration doubleValue]]; 13 if ([duration doubleValue] != 0) 14 { 15 [UIView setAnimationCurve:[curve intValue]]; 16 } 17 _tfToolBar.frame = [self changeYForFrame:_tfToolBar.frame withY:keyboardFrame.origin.y-_tfToolBar.frame.size.height]; 18 _mainTabel.frame = [self changeHeightForFrame:_mainTabel.frame withHeight:keyboardFrame.origin.y-_tfToolBar.frame.size.height]; 19 [UIView commitAnimations]; 20 21 //让表滚到最下面一行 22 if ([_chatArr count]) 23 { 24 NSIndexPath *lastPath=[NSIndexPath indexPathForRow:[_chatArr count]-1 inSection:0]; 25 [_mainTabel scrollToRowAtIndexPath:lastPath atScrollPosition:UITableViewScrollPositionBottom animated:YES]; 26 } 27 }
然后奇葩的事发生了,table拉长的时候,原来最顶上未显示的几个cell要被绘制出来.但是因为table的frame改变实在Animations里面进行的,因此绘制cell也带上了动画效果= =
调试过程就不多说了,反正刚开始没找到症结(开始还以为是单元格重用造成的).知道是怎么回事了就简单了.20行的地方加个[_mainTabel reloadData]就万事大捷了...
