[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyBoardChange:) name:UIKeyboardWillChangeFrameNotification object:nil];
//实现接收到通知时的操作
-(void) keyBoardChange:(NSNotification *)note
{
//获取键盘弹出或收回时frame
CGRect keyboardFrame = [note.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
//获取键盘弹出所需时长
float duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue];
//添加弹出动画
[UIView animateWithDuration:duration animations:^{
self.tableView.transform = CGAffineTransformMakeTranslation(0, keyboardFrame.origin.y - (mainHeight));
}];
}
