活动时将SearchBar向上移动

Question

目前我的搜索栏位于我视图的中心。我想知道是否有办法让它在活动时移动到视图的顶部，然后在不活动时移回。

任何帮助？

Answer 1

将以下KeyBoard观察者通知添加到ViewWillAppear

 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

在KeyboardWillShow中，将搜索栏移至顶部

-(void)keyboardWillShow:(NSNotification*)sender
{
  //Move search bar to top 
  self.searchBar.frame=CGRectMake(0, 10, self.searchBar.frame.size.width, self.searchBar.frame.size.height);
}

在KeyBoardWillHide中，将搜索移至中心

-(void)keyboardWillHide:(NSNotification*)sender
{
  //Move search bar to center
 self.searchBar.frame=CGRectMake(0, self.view.frame.size.height/2, self.searchBar.frame.size.width, self.searchBar.frame.size.height);

}

在ViewWillDisappear中，删除键盘观察器

 [[NSNotificationCenter defaultCenter]removeObserver:self name:UIKeyboardWillHideNotification object:nil];
 [[NSNotificationCenter defaultCenter]removeObserver:self name:UIKeyboardWillShowNotification object:nil];